Things which are Important in Our Lives Essay Example | Topics and Well Written Essays - 1000 words

Things which are Important in Our Lives - Essay Example The ways that things make our lives more comfortable are countless. From the moment we wake up until we sleep, things are there make our lives easier. We sleep on a thing called the bed and wakes up with the alarm of another thing called alarm clock. Our breakfast would not have been prepared if not the convenience of cooking things in the kitchen. When we prepare ourselves either for school or work, things are again present for us. We dress in clothes appropriate for us and go to school or work in another form of thing which is a car. Even our place of work school is filled with things. In school, computers make studying easier especially the internet. Our daily lives are basically filled with things to make it convenient for us. Things also enable us to do a lot of things which otherwise would have been difficult to do without those things. I can concretely cite the example of a computer and internet without which studying and doing research would have been very difficult. If I have to do a term paper, I will have to physically go to the library and scour through the catalogs before finding the books and magazine that I need for research. After finding those materials that I need, I have to borrow them physically or copy the text if I am not allowed to bring the books at home. I would have to laboriously go all through them which will take a lot of time and effort. And even writing the report would require a great deal of effort because I have to manually type them. The thing called computer and internet releases me from those burdens and allow me to study better. I can scour through books and journals and other articles right in the comfort of my home. This is faster and more convenient. The information I c an find using the computer and the internet in minutes may take me hours if I will do it physically in the library.  

Into Thin Air Case Study Example | Topics and Well Written Essays - 1250 words

Into Thin Air - Case Study Example The implications of decision making and persuasion of a group by a mountain climbing leader led to the death of nine people within a single day as a bad storm walloped up on Mount Everest (Krakauer, 2009). From the narration of Jon Krakauer, it is revealed that during this mountain climbing experience, three more lives were lost before a month elapsed. This mountaineering experience at Everest took place in the spring of the year 1996. In decision making, information or knowledge is one of the most crucial elements of a leader of a group. This is because if there is lack of knowledge, making of choices is not likely to be informed. For example the climbers in the case study had no knowledge that anything was likely to go wrong as they started their commercial expedition for the Everest Summit at the South Col. It is lack of any knowledge of what was ahead that persuasion was achieved and the group made a decision to go ahead with the expedition. Nonetheless, leaders of a group are ob liged to make members aware of the risks which are associated with the decisions that they make (Robert, 2001). This is demonstrated in the case where it is said that all members of the mountaineering expedition were conscious of the possible trouble that they would face but they did not realize that it would lead to loss of lives and make it the worst mountaineering expedition at Mount Everest (Krakauer, 2009). ... Experience makes leaders capable of making the right decisions and the success they attain inn decision making is attributed to the faith that members of a group have for such leaders and their persuasion appeal (Robert, 2001). The decision making of the climbing guide for the team was a fixed and strict turnaround timing which Hall put at 1 pm. It is notable that during the climbing experience most climbers did not adhere to the turnaround time as posted by the guide. This is seen by the fact that some climbers turned around at 3 pm (Krakauer, 2009). In this sense it can be argued that the guide of the climbing expedition was not able to successfully persuade the group of the importance that was attached t adherence to the turnaround time and the possible consequences that would emanated from decisions of failing to turnaround when expected. The decision Hall had for the group for the 1 pm turnaround proved to be very costly for the whole group. This is because of the fact that at t his time the air at the mountain is very thin (Krakauer, 2009). It is in light of this sentiment that it is argued that the decision that was made by the leader of the group was not sufficiently informed. And if it was informed it s evident that the leader was ready to take risks associated to decision making. Nonetheless the ability of the leader in convincing the group to the 1 pm turnaround demonstrates how persuasion for a group would lead to decisions that are likely to lead to negative implications late on. Charisma and eloquence are usually attributed to the ability of leaders to make persuasive decisions that make members of a group convinced to follow suit to what is decided by the leader. In light of the case study, it can be argued that it is the

Models of Professionalism in the PR Industry

Models of Professionalism in the PR Industry Professionalism is an attempt to translate one order of scarce resources, specialist knowledge and skills into social and economic rewards (Larson, 1977). It is describes as a sphere of expertise and identifying level of practice and competencies among Public Relations practitioners which has been developed for over hundreds years ago in our society. Different Public Relations (PR) associations shall practice different forms of code ethics. For example most of PR associations adopted Code of Athens while others have their own code of ethics as guidelines. In accordance to Brown (1986), he defined ethics as a set of values that establishes the criteria by which conduct will be judged. Ethics also are culture-bound and therefore create some difficulties for global public relations practice. Thus, Code of Ethics is a formal statement of an organisations values on certain ethical and social issues. The famous four models that influence the contemporary public relation theories of practice were adapted from Grunig and Hunts (1984). They comprised of Public agentry /publicity that was used to draw attention to an event. A two-way asymmetric will deal with the feedback from the public by providing persuasive communication. Whereas a two way symmetric is mutual understandings between the public and organisation that was built through dialogue, listening and understanding. Other theories discussed are the systems theory that helped to explain and predict organisation behaviours and contribution of PR role to the entity as whole. A situational theory is a tools to categorise publics perceptions of a situation and their subsequent behaviour; and agenda setting theory discussed about the media and the way news is selected by media outlets for consumption by the public (Sheehan Xavier 2009). PR practitioner are demanded to be ethical as they go professional. According to Seithel (1997), PR practitioner must be honest and trustworthy to cater the needs of the public and individual organisation in order to protect those who entrust their well being to the professional (try to rephrase the sentence- vague). They also need to protect their profession values and commit themselves to uphold the profession by honouring its obligation and values. In order to quantify professionalism, PR practitioner should demonstrate their skills on handling special tasks. Professionalism are divided into three categories. First, it is an act to serve the best interest of client and public, Utility of vagueness (Kultgen,1988) which contributes to the ideological use of functionalist models in the struggle for status. Secondly, it acts as an ideology of advocacy (Simon, 1978) where professional is neutral and detached from the clients purposes and also create an aggressive partisan of the client working to advance the clients needs. Finally, they denote a right that the public possesses by virtue of being the primary, generic unit in society. It is also denotes a benefit(s) from publics relationship with other units to insure the well-being of society as a whole.(nda ku paham) However as Bayles (1981) states not all responsibilities are those of individual professionals. Some are responsibilities of a profession as a whole and cannot be reduced to obligations of individual professionals. The use of professionalism normally linked in PR field with the expression of the need to improve occupational standing- body of knowledge, ethics and certification to understand the defining characteristics of profession (Cutlip, Center Broom, 1994, pp.129-163; Grunig Hunt, 1984,pp. 66-69; Wylie, 1994). This is to improve the effectiveness of public relations as well as their image of presentation. But how? Any examples For example, Institute of Public Relation in Malaysia does not belong to individual professional Public Relations practitioner but its portals who desire the systematic, organized growth and development of Public Relations as a profession, who contribute positively to the nations continuous growth and development in all spheres of human endeavours. This was subjected due to the different culture backgrounds and races in Malaysia. The main objective of Institute of Public Relation in Malaysia is to enhance professionalisms among public relations practitioners in Malaysia. To be more specific, the objectives of Institute of Public Relation in Malaysia are:- 1.Supports research and other educational activities in public relations. 2.Giving advice and provide information and create opportunities for discussions on all aspects of public relation activities. 3.To promote the understanding, development and recognition of public relations. 4.To established and prescribe standards of professi onal and ethical conduct and ensure the observance of those standards. 5.To encourage the attainment of professional academic qualification. 6.To nurture, promote and maintain contacts with public relation practitioners. The Institute of Public Relation in Malaysia (IPRM) has its own code of ethics to manage the practice of Public Relations in Malaysia. Public Relations practitioners in Malaysia are governed in two ways, firstly by the Code of Professional Conduct (Code of Athens) which was enforced by the institute of Public Relations Malaysia. Any negligence they can be fined and deregistered. Secondly, it is governed by the law of the country where Public Relations practitioner can be sued or imprisoned for any offences committed under the law of the country such as Printing Presses and Publication Act 1984, Seditition Act 1948, Defamation Act 1957, Copyright Act 1987 and Internal Security act 1960, revised in 1972. Institute of Public Relation in Malaysia Code of Ethics was adapted from the Code of Athens where all members should:- 1.Conduct professional activities with respect for the public interest 2.Shall at all time  deal fairly and honestly with his client or employers, past and present, with fellow members and with the general public 3.Shall not intentionally disseminate false or misleading information; maintain truth, accuracy and good taste. 4.Shall not engage in any practices which tend to corrupt the integrity of channels of public communication. 5.Shall not create or use of any organisation purporting to serve some announced cause  but actually promoting a special private interest of a member or his client or his employer which is not apparent 6.Shall safeguards the confidence of both present and formers clients and employers. Shall not disclose confidential information. 7.Shall not represent conflicting or competing interest 8.Shall not accept fees, commission or any other valu able consideration from anyone either than his client or employer. 9.Shall not attract business unfairly 10.Shall not purpose to prospective client or employer that his fee or other compensation to be contingent on the achievement of certain result. 11.Shall not intentionally injure the profession reputation or practice of another member 12.Shall not engaged in or be connected with any occupation or business which is not consistent with membership of the institute. 13.Shall not seek to supplant another member with his/her employer or client, no shall he/she encroach upon the professional employment of another member unless both parties are assured that there is no conflict of interest involved. 14.Shall corporate with fellow members in upholding and enforcing the code. In Malaysia, system theory of public relations and strategy strengthen the concepts of public relations management in Malaysia. System theory (general system theory) is widely being applied to the field of public relation in order to explain and predict the organisational behaviours and explain how the public relations role contributes to the entity as a whole (Sheehan and Xavier, 2009). With the application of system theory, professional can play their adaptive roles in shaping the standards of professionalism based on the concept of adjustment and adaptation of public relations. It is important in creating transparency of the organisations to their environment. Professional public relations practitioners should be able to respond to the dynamic real world, especially in competitive business environment (Cutlip et al., 2000; Cornelissen, 2004:167) For example, case study done by Zulhamri Abdullah and Therry Threadgold: Waste Management Company, CEOs stated that Unlike multinational companies which are taking a great concern over public relations as they have gone up and down, but some Malaysian companies have not really exposed to high competition and being having good at all time. Malaysian CEOs must be more agile and competitive. Communication is very important for a company to be appeared as the best company. This can be done by communicating and engaging your business with external stakeholders. Thats why we invest in PR to be seen by our stakeholders. A real PR practitioner must be able to influence a CEOs thinking and judgement. Here, PR is a part of top management committee. This statement shows the importance of the role of PR in the company and how the CEOs trust the PR ideas and judgement towards decision- making. Good communication skills will help the PR to exploit the business deals with internal and external stakeholders. In order to realise this vision, the development of PR knowledge is important towards the professionalism in the field. For nurturing real professionals and improve level of competencies among PR fraternity, it will take a long process. A lack of talent, skills and competency among PR practitioners are the most critical issues faced by the organisations/sectors. Accreditation is an important requirement in professionalization of PR practice which is based on voluntary rather than an imposed mandatory system. It should be more focus on providing technical and managerial knowledge and skills which is more complex and sophisticated. Social responsibility was the aim of IPRM and other PR Institute, in order to proof occupations value to the society by giving or putting facts which can be supported by the truth. Organisation in democratic societies exists with consent of the public so it is a must for the organisation to be socially responsible. There are some advantages and disadvantages of socially responsible PR. The advantages are by helping them to improve their professional practice through codifying and enforcing ethical conduct and standards of performance, stressing the need of the public. Also they serves the public interest by discussing the view articulate in the forum and to promote human welfare by helping social system to adapt the changing needs and environments. Whereas as a drawback, PR gains advantages for and promote special interest, sometimes at the cost of the public well being, strangled the channels of communication that confuses, and also corrodes the channel of communication with the cynicism and credibility gap. As conclusions, in order to be professional Public Relations practitioner, he/she must abide the code of ethics which have been provided by their organisations. They also should be trustworthy in handling specific task in order to gain trust from clients and the public itself. The level of skills to be professional will be judged through their expertise on handling the tasks given. ( dang ur conclusion not good enuf lah write more.. kalo boleh support with any statement) References: Abdullah Z. Threadgold T. Towards the Professionalisation of Public relations in Malaysia: Perception Management and Strategy Development. (accessed date 16/08/09) Barlett, J., Twyoniak, S. Hatcher, C. 2007. Public relations professional practice and the institutionalisation of CSR. Journal of Communication management, 11, 4, 281-99. Bivins, T. 1993. Public Relations, Professionalism, and the public interest. Journal of Business Ethics, Feb, 12, 2. Cornelissen, J.P. 2004. Corporate Communication: Theory and Practice. London: Saga Publication. Cutlip, S.M., Center, A.H broom, G.M. 2000. Effective Public Relations. London: Prentice Hall International, Inc. Institute of Public Relation in Malaysia.2009. Code of Ethics. http://www.iprm.org.my/index.php/code-of-athens/english-version (accessed date 16/08/09) Johnston J Zawawi C (eds), 2004, Public Relations Theory and Practice , 2nd edn, Allen and Unwin, Crows nest, NSW Pieczka M. and LEtang J. 2006. Public relations and the question of professionalism, in LEtang and Pieczka (eds). Public Relations Critical Debates and Contemporary Practice. Mahwah NJ: Lawrence Erlbaum, 265-78 Sheehan M. Xavier R. (eds) 2009, Public Relations Campaigns, 1st edn, Copyright Agency Limited, Sydney NSW.

The Constitutional Issue of Abortion :: Argumentative Persuasive Topics

The Constitutional Issue of Abortion Three Works Cited Many people believe abortion is only a moral issue, but it is also a constitutional issue. It is a woman's right to choose what she does with her body, and it should not be altered or influenced by anyone else. This right is guaranteed by the ninth amendment, which contains the right to privacy. The ninth amendment states: "The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people." This right guarantees the right to women, if they so choose, to have an abortion, up to the end of the first trimester. Regardless of the fact of morals, a woman has the right to privacy and choice to abort her fetus. The people that hold a "pro-life" view argue that a woman who has an abortion is killing a child. The "pro-choice" perspective holds this is not the case. A fetus is not yet a baby. It does not posses the criteria derived from our understanding of living human beings. In a notable defense of this position, philosopher Mary Anne Warren has proposed the following criteria for "person-hood": 1) consciousness (of objects and events external and or internal to the being), and in particular the capacity to feel pain. 2) reasoning (the developed capacity to solve new and relatively complex problems) 3) self-motivated activity (activity which is relatively independent of either genetic or direct external control) 4) the capacity to communicate, by whatever means, messages of an indefinite variety of possible contents, but on indefinitely many possible topics. 5) the presence of self-concepts, and self-awareness, either individual or social, or both. (Taking Sides -Volume 3). Several cases have been fought for the right to choose. Many of these have been hard cases with very personal feelings, but the perseverance showed through and gives us the rights we have today. Here are some important cases: 1965 - Griswold v. Connecticut - upheld the right to privacy and ended the ban on birth control. Eight years later, the Supreme Court ruled the right to privacy included abortions. Roe v. Wade was based upon this case. 1973 - Roe v. Wade: - The state of Texas had outlawed abortions. The Supreme Court declared the law unconstitutional, but refused to order an injunction against the state. On January 22, 1973, the Supreme Court voted the right to privacy included abortions.

Advantages of Verbal communication Essay

Verbal communication- The sharing of information between individuals by using speech. Individuals working within a business need to effectively use verbal communication that employs readily understood spoken words, as well as ensuring that the enunciation, stress and tone of voice with which the words are expressed is appropriate. Read more: http://www.businessdictionary.com/definition/verbal-communication.html#ixzz2PT6EzJTZ We all communicate on a daily basis either with others or ourselves. Verbal communication is one approach for individuals to communicate in a straight forward manner. There are multiple basic components of verbal communication such as audio, words, dialog, and language. Whatever technique of interaction is used, written, body language, or verbal, each is considered a form of communication and is needed for us to communicate. In order to be a success in the world we live in today, possessing clear communication skills are essential for an individual to have strong comprehension skills and an aptitude for communicating effectively. Lacking these, abilities can be a great setback and may create concerns contingent given the situation. When communicating verbally, one of the most essential things not to forget it that our voice itself can communicate more about us than our actual message. Some superlative mechanisms exist while engaged in verbal communication, which are sound, language, and vocalizations. Throughout dialogues we often attempt to exclude any likely chance of misunderstanding and instead be specific and to the point. However, many times that is quite arduous to those who are not as skilled in communication as others are. Mostly, we hope and presume that the message we conveyed has been fully accepted by our speaking audience, since to us the information being transmitted may be important and so we assume that this information is be seen as important to those who receives it. While words only account for approximately 7% of the meaning people ascribe to your communication, tone of voice accounts for 38% of the m eaning. So, it’s obvious that to be a successful communicator, you need to be aware of your verbal cues and clues (e.g., everything from words to sighs, moans, grunts). Inflection refers to ups and downs in talking. Inflection helps you signal to your partner what’s important and may even indicate your emotional state (especially combined with volume and pitch). Volume indicates the degree of loudness to your voice. Again, volume can indicate your energetic involvement with a topic and gives your spouse clues about your temperament and mood. Pacing deals with your rate of speech or the speed of your talking. Matching your rate of speech and your intensity to that of your partner creates rapport and connection. Word choice of course means what words you use to convey your message. Though words may have specific definitions, our lifetime of experience with a word means that our meaning for the word and someone else’s meaning might be quite different. Silence refers to those gaps in our conversations. (Though silence is â€Å"non-verbal† it’s the absence of verbal communication, that’s why I’ve included it in this list.) Allow room for your partner to absorb what you’ve said and give yourself the space to take in what he/she is communicating to you. Advantages: Some of the advantages of the oral communication are: 1. Its easy and simple and saves a lot of money because oral communication is the less expensive way to communicate with each other. 2. It allows feedback on the spot so if the receiver is not 100 percent sure what the message meant, then that feedback will be answered right away. 3. Because the message is instantly, it helps in avoiding time wasted. 4. It brings personal warmth and friendliness and develops a sense of bonding because of these contact between the people. Disadvantages: Some of the disadvantages of the oral communication are: 1. There is no instant feedback between the messenger and the receiver and that the messages could be misunderstood. 2.Long and wordy type of communication cannot be as effectively as verbal messages. 3.The receiver might understand the message differently. 4. responses on the spot might not be carefully thought of. 5. More or less or a different meaning might be conveyed by manner of speaking,tone of voice and facial expressions. Verbal communication refers to the use of sounds and language to relay a message. It serves as a vehicle for expressing desires, ideas and concepts and is vital to the processes of learning and teaching. In combination with nonverbal forms of communication, verbal communication acts as the primary tool for expression between two or more people. Types Interpersonal communication and public speaking are the two basic types of verbal communication. Whereas public speaking involves one or more people delivering a message to a group, interpersonal communication generally refers to a two-way exchange that involves both talking and listening. According to Robert M. Krauss, professor of psychology at Columbia University, signs and symbols are the major signals that make up verbal communication. Words act as symbols, and signs are secondary products of the

Aristo Book 5 experiment answer Essay

HKDSE CHEMISTRY – A Modern View (Chemistry) Experiment Workbook 5 Suggested answers Chapter 52 Importance of industrial processes Chapter 53 Rate equation Experiment 53.1 Determining the rate equation of a reaction using method of initial rate (A microscale experiment) 1 Chapter 54 Activation energy Experiment 54.1 Determining the activation energy of a chemical reaction 3 Chapter 55 Catalysis and industrial processes Experiment 55.1 Investigating the action of a catalyst 6 Experiment 55.2 Investigating homogeneous catalysis 8 Experiment 55.3Investigating ways to change the rate of a reaction with a suitable catalyst 9 Experiment 55.3 Sample laboratory report 13 Experiment 55.4Preparing ethanol by fermentation 16 Chapter 56 Industrial processes Chapter 57 Green chemistry for industrial processes Chapter 53Rate equation Experiment 53.1Determining the rate equation of a reaction using method of initial rate (A microscale experiment) 7. and 11.(a) Well number 1 2 3 4 5 6 7 8 Number of drops of 0.5 M Na2S2O3(aq) 10 9 8 7 6 5 4 3 Time, t (s) 14.2 15.8 17.8 20.4 23.8 28.6 35.7 47.6 (sï€ ­1) 0.070 0.063 0.056 0.049 0.042 0.035 0.028 0.021 10. and 12.(a) Well number 1 2 3 4 5 6 7 8 Number of drops of 1.0 M H2SO4(aq) 10 9 8 7 6 5 4 3 Time, t (s) 59.4 59.7 60.0 60.7 59.9 60.0 61.0 60.5 (sï€ ­1) 0.017 0.017 0.017 0.016 0.017 0.017 0.016 0.017 11.(a)inversely (b) (c)1 12.(b)0 (c)From the results in Table 53.2, the readings of time are close, indicating that the reaction is of zeroth order with respect to H+(aq). 13.Rate = k[S2O32ï€ ­(aq)] 14.S2O32ï€ ­(aq) + 2H+(aq) ï‚ ® S(s) + SO2(g) + H2O(l) 15.In this experiment, the time for the formation of a fixed, but small amount of insoluble sulphur precipitate is measured. The shorter the time, the faster is the reaction. It is assumed that the extent of reaction is still small when the time is recorded, so that the time recorded can be used as a measurement of initial rate of the reaction. Chapter 54Activation Energy Experiment 54.1Determining the activation energy of a chemical reaction 5. Temperature of the reaction mixture ( °C) 15 25 35 45 55 Time for the appearance of dark blue colour (s) 679 (at 11 °C) 232 (at 27 °C) 112 (at 37 °C) 80 (at 43 °C) 33 (at 56 °C) 6.(a)rate constant; activation energy; Universal gas constant; temperature; (b) log () ï€ ­2.83 ï€ ­2.37 ï€ ­2.05 ï€ ­1.90 ï€ ­1.52 3.52 3.33 3.23 3.16 3.04 (c) (d)ï€ ­2750 (e)slope = ï€ ­2750 = Ea = 2750 Ãâ€" 2.3 Ãâ€" 8.314 J molï€ ­1 = 52 586 J molï€ ­1 = 52.6 kJ molï€ ­1 7.Arrhenius equation; log k = log A 8.straight line; 9.S2O82ï€ ­(aq) + 2Iï€ ­(aq) ï‚ ® 2SO42ï€ ­(aq) + I2(aq) 10.To monitor the formation of iodine from the reaction of S2O82ï€ ­(aq) ions and Iï€ ­(aq) ions. 11.When all S2O82ï€ ­(aq) ions have reacted, any iodine formed will turn the starch solution dark blue. The time for this colour change is a measure of the rate of reaction shown in question 9. (Note: The reaction rate is inversely proportional to the time taken for the starch solution to turn dark blue.) 12.The amount of reactants used in each experiment may not be exactly the same. There may be an error in measuring or reading the temperatures from the thermometers. As the colour change of the solution mixture is not a sudden one, especially at low temperatures, there may be an error in recording the time of colour change. Chapter 55Catalysis and industrial processes Experiment 55.1Investigating the action of catalyst 1.(b)No. 5.(b) Time (s) 10 20 30 40 50 60 Volume of O2(g) released (cm3), with the addition of 0.5 g MnO2(s) 30 60 85 95 96 96 Time (s) 70 80 90 100 110 120 Volume of O2(g) released (cm3), with the addition of 0.5 g MnO2(s) 96 6.(b) Time (s) 10 20 30 40 50 60 Volume of O2(g) released (cm3), with the addition of 1.5 g MnO2(s) 70 90 95 96 96 Time (s) 70 80 90 100 110 120 Volume of O2(g) released (cm3), with the addition of 1.5 g MnO2(s) 8. 9.Manganese(IV) oxide MnO2(s) 10.2H2O2(aq) ï‚ ® 2H2O(l) + O2(g) 11.(a)The addition of manganese(IV) oxide greatly increases the rate of decomposition of hydrogen peroxide. (b)(i)The initial rate of reaction is higher. (ii)The total time of reaction is shorter. (Note: increasing the amount of catalyst would increase the reaction rate.) (c)No. 12.Add more H2O2(aq) to the reaction mixture, rapid effervescence shows that manganese(IV) oxide has not been used up in the reaction. The catalytic property of manganese(IV) oxide is still present. Experiment 55.2Investigating homogeneous catalysis 5.Mixture ‘y’. It has a characteristic sweet smell like certain glues or nail polish removers. 6.ethyl ethanoate; concentrated sulphuric acid 7.CH3COOH(l) + CH3CH2OH(l) â‡Å' CH3COOCH2CH3(l) + H2O(l) 8.Homogeneous catalyst. This is because all species are in the same phase in the reaction, i.e. the liquid phase. 9.Sodium carbonate solution reacts with any unreacted ethanoic acid left in the reaction mixture. The strong vinegar smell of ethanoic acid is thus removed. The salt sodium ethanoate formed has no smell. Besides, the ester is insoluble in water and floats on the water surface. This makes us easier to detect the smell of ester. Experiment 55.3Investigating ways to change the rate of a reaction with a suitable catalyst 1.Apparatus: Safety spectacles Protective gloves Conical flask (100 cm3) 5 measuring cylinders (10 cm3) Dropper Stopwatch Boiling tube White tile Chemicals: Ammonium peroxodisulphate solution (0.020 M) Potassium iodide solution (0.50 M) Sodium thiosulphate solution (0.010 M) 0.2% starch solution Iron(II) chloride solution (~0.010 M) Distilled water 2. What you will keep constant (Controlled variable) What you will change (Independent variable) What you will measure (Dependent variable) volume of ammonium peroxodisulphate solution volume of potassium iodide solution volume of sodium thiosulphate solution amount of 0.2% starch solution with or without using iron(II) solution the time for the appearance of the dark blue colour 3. Figure 1 4. (1)Using a measuring cylinder, add 10 cm3 of ammonium peroxodisulphate solution to a conical flask. (2)Using different measuring cylinders, add 5 cm3 of potassium iodide solution, 5 cm3 of sodium thiosulphate solution, 1 cm3 of iron(II) chloride solution and 2.5 cm3 of starch solution to a boiling tube. (3)Pour the contents in the boiling tube into the conical flask. (4)Immediately start the stopwatch. (5)When a dark blue colour of the starch-iodine complex appears in the solution, stop the stopwatch. (6)Record the time for the appearance of the dark blue colour in Table 1. (7)Repeat steps (1) to (6), but replace iron(II) chloride solution with 1 cm3 of distilled water. 5. Risk assessment form 6. Time for the appearance of the dark blue colour With Fe2+(aq) ions (as a catalyst) added 59 s Without any catalyst added 3 mins and 52 s Table 1 7.The reaction involves the collision of two negatively charged ions, S2O82ï€ ­(aq) ions and Iï€ ­(aq) ions, which actually repel each other. 8.S2O82ï€ ­(aq) + 2Fe2+(aq) ï‚ ® 2SO42ï€ ­(aq) + 2Fe3+(aq) 2Fe3+(aq) + 2Iï€ ­(aq) ï‚ ® 2Fe2+(aq) + I2(aq) 9.Referring to the two equations in question 8, the S2O82ï€ ­(aq) ions oxidize the Fe2+(aq) ions to Fe3+(aq) ions. At the same time, the S2O82ï€ ­(aq) ions are reduced to SO42ï€ ­(aq) ions. The Fe3+(aq) ions are strong oxidizing agents that oxidize Iï€ ­(aq) ions to I2(aq). At the same time, Fe3+(aq) ions are reduced back to Fe2+(aq) ions (i.e. the catalyst is regenerated). Both the equations shown in question 8 involve the collision between positive and negative ions. This will be much more likely to be successful than the collision between two negative ions in the uncatalysed reaction. Thus, the activation energy of this pathway will be lower and the reaction rate will also be higher. 10.The chemical reaction can be speeded up by the addition of iron(II) ions, which act as a homogeneous catalyst of this reaction. 11.It can be regenerated after the reaction. OR It is specific in action. OR A small amount of catalyst is usually enough for the catalytic action. 12.Homogeneous catalyst is one which has the same phase as the reactants and products. Sample laboratory report Title: Investigating ways to change the rate of a reaction with a suitable catalyst Objective To design and carry out an experiment to investigate ways to change the rate of a reaction – by the use of a suitable catalyst. Apparatus and materials Safety spectacles Protective gloves Conical flask (100 cm3) 5 measuring cylinders (10 cm3) Dropper Stopwatch Boiling tube White tile Ammonium peroxodisulphate solution (0.020 M) Potassium iodide solution (0.50 M) Sodium thiosulphate solution (0.010 M) 0.2% starch solution Iron(II) chloride solution (~0.010 M) Distilled water Chemical reactions involved S2O82ï€ ­(aq) + 2Fe2+(aq) ï‚ ® 2SO42ï€ ­(aq) + 2Fe3+(aq) 2Fe3+(aq) + 2Iï€ ­(aq) ï‚ ® 2Fe2+(aq) + I2(aq) Procedure 1.Using a measuring cylinder, 10 cm3 of ammonium peroxodisulphate solution was added to a conical flask. 2.Using different measuring cylinders, 5 cm3 of potassium iodide solution, 5 cm3 of sodium thiosulphate solution, 1 cm3 of iron(II) chloride solution and 2.5 cm3 of starch solution were added to a boiling tube. 3.The contents in the boiling tube were poured into the conical flask. 4.The stopwatch was started immediately. 5.When a dark blue colour of the starch-iodine complex appeared in the solution, the stopwatch was stopped. 6.The time for the appearance of the dark blue colour was recorded in Table 1. 7.Steps (1) to (6) were repeated, but iron(II) chloride solution was replaced with 1 cm3 of distilled water. Results Time for the appearance of the dark blue colour With Fe2+(aq) ions (as a catalyst) added 59 s Without any catalyst added 3 mins and 52 s Table 1 After mixing all the chemicals in the conical flask, the reaction mixture with Fe2+(aq) ions will take a shorter time for the dark blue colour to appear. Analysis 1. In the absence of Fe2+(aq) ions, the reaction between S2O82ï€ ­(aq) ions and I ­Ã‚ ­Ã¯â‚¬ ­(aq) ions is slow. As both reactant ions are negatively charged, they tend to repel each other. However, when Fe2+(aq) ions are added, the reaction becomes faster. Fe2+(aq) ions have the same phase (i.e. aqueous phase) as the reactants and products, so they are homogeneous catalyst of this reaction. 2. Fe2+(aq) ions is a reducing agent which can reduce S2O82ï€ ­(aq) ions to SO42ï€ ­(aq) ions. The Fe3+(aq) ions formed act as an oxidizing agent, which oxidize I ­Ã‚ ­Ã¯â‚¬ ­(aq) ions to I2(aq) ions and regenerate Fe2+(aq) ions again. Being a catalyst, Fe2+(aq) ions are not consumed in the catalytic process. Discussion 1.Either Fe2+(aq) ions are Fe3+(aq) ions is a good choice of catalyst for this reaction because the interconversion between Fe2+ and Fe3+ facilitates the reaction between S2O82ï€ ­(aq) ions and I ­Ã‚ ­Ã¯â‚¬ ­(aq) ions to occur. 2.The catalytic property of Fe2+(aq) ions may be due to the fact that it is easier for the negatively charged S2O82ï€ ­(aq) ions to approach the positively charged Fe2+(aq) ions. The same is true when the positively charged Fe3+(aq) ions formed can approach the negatively charged I ­Ã‚ ­Ã¯â‚¬ ­(aq) ions easier. 3.The experiment is just a simple test tube experiment but the result (colour change) is quite obvious and easy to detect. Conclusion The chemical reaction can be speeded up by the addition of Fe2+(aq) ions, which act as a homogeneous catalyst of this reaction. Answers to questions for further thought 11.It can be regenerated after the reaction. OR It is specific in action. OR A small amount of catalyst is usually enough for the catalytic action. 12.Homogeneous catalyst is one which has the same phase as the reactants and products. Experiment 55.4Preparing ethanol by fermentation 3.(b) Glucose solution with yeast Glucose solution without yeast Appearance of the glucose solution a pale brown suspension a clear solution Observations in the limewater clear and colourless clear and colourless 6.(d)Acidified potassium dichromate solution changes colour from orange to green. (f)No colour change for the acidified potassium dichromate solution. 7. Glucose solution with yeast Glucose solution without yeast Appearance of the glucose solution cloudy; a pale brown suspension clear, no visible change Observations in the limewater milky remains clear and colourless Smell of the glucose solution a smell of alcohol no characteristic smell 8.catalyst 9.ethanol; carbon dioxide 10.The solution turns milky. It indicates that carbon dioxide is produced during fermentation. 11.In the presence of yeast, glucose is converted to ethanol. The presence of ethanol is indicated by the colour change of the reaction with acidified potassium dichromate solution. Ethanol is a reducing agent. It reduces dichromate ions to chromium(III) ions.

Free Essays on The Importance Of Time

The Importance of Time During the renaissance, many great writers were emerging from the lower class and into a much higher class. One of these famous writers is William Shakespeare, Shakespeare wrote plays and sonnets. Through his works of literature he shows many universal elements, such as love death, time and other elements. Shakespeare’s sonnet form is very unique. Most of his sonnets use ten syllables per line and fourteen lines with a rhyme couplet at the last two lines. His pattern is usually a b a b c d c d e f e f g g. Shakespeare’s sonnets focus on the elements of love, death, time, and other elements that help explain the sonnet in greater detail. A well know myth is that sonnets 1 to 126 were addressed to a young man and that sonnets 127 to 152 were written to a â€Å"Dark Mysterious Lady† (Adventures in English Literature 136). â€Å"Like as the waves make towards the pebbled shore, So do our minutes hasten to their end; Each Changing Place with that which goes before, In sequent toil forwards do contend. Nativity, once in the main of light, Crawls to maturity, wherewith being crown’d, Crooked eclipses ‘gainst his glory fight, And Time that gave doth now his gift confound. Time doth transfix the flourish set on youth And delves the parallels in beauty’s brow, Feeds on the rarities of nature’s truth, And nothing stands but for his scythe to mow: And yet to times in hope, my verse shall stand Praising thy worth, despite his cruel hand.† Lines 1 to 2 means when the sea tide moves onto the shore the tides is cut short. A human’s life does the same. â€Å"Our minutes† always seems to go by faster and quicker making life short. Lines 3 to 4 explain the changes of life from one thing to the next. Lines 5 to 8 are the stages of life from birth to maturity to death. Lines 9 to 12 explains how Time â€Å"transfixes† life and how Time takes a life after life was perfect. Lastly lines 13 to 14, the... Free Essays on The Importance Of Time Free Essays on The Importance Of Time The Importance of Time During the renaissance, many great writers were emerging from the lower class and into a much higher class. One of these famous writers is William Shakespeare, Shakespeare wrote plays and sonnets. Through his works of literature he shows many universal elements, such as love death, time and other elements. Shakespeare’s sonnet form is very unique. Most of his sonnets use ten syllables per line and fourteen lines with a rhyme couplet at the last two lines. His pattern is usually a b a b c d c d e f e f g g. Shakespeare’s sonnets focus on the elements of love, death, time, and other elements that help explain the sonnet in greater detail. A well know myth is that sonnets 1 to 126 were addressed to a young man and that sonnets 127 to 152 were written to a â€Å"Dark Mysterious Lady† (Adventures in English Literature 136). â€Å"Like as the waves make towards the pebbled shore, So do our minutes hasten to their end; Each Changing Place with that which goes before, In sequent toil forwards do contend. Nativity, once in the main of light, Crawls to maturity, wherewith being crown’d, Crooked eclipses ‘gainst his glory fight, And Time that gave doth now his gift confound. Time doth transfix the flourish set on youth And delves the parallels in beauty’s brow, Feeds on the rarities of nature’s truth, And nothing stands but for his scythe to mow: And yet to times in hope, my verse shall stand Praising thy worth, despite his cruel hand.† Lines 1 to 2 means when the sea tide moves onto the shore the tides is cut short. A human’s life does the same. â€Å"Our minutes† always seems to go by faster and quicker making life short. Lines 3 to 4 explain the changes of life from one thing to the next. Lines 5 to 8 are the stages of life from birth to maturity to death. Lines 9 to 12 explains how Time â€Å"transfixes† life and how Time takes a life after life was perfect. Lastly lines 13 to 14, the...