(i) Heat to temperatures above 400K - Use a catalyst
(ii) Polyethene
(iii) It pollutes the environment or produces poisonous gases when burnt.
johnmulu answered the question on June 7, 2017 at 06:48
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Give the name of two organic compounds that can be used to prepare this compound in the laboratory.
Date posted: June 7, 2017. Answers (1)
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Name and describe the process that takes place in steps I and II.
Date posted: June 7, 2017. Answers (1)
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Date posted: May 25, 2017. Answers (1)
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Name the process undergone by propane
Date posted: May 25, 2017. Answers (1)
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(iii) What name is given to the process that takes place in step 5?
Date posted: May 25, 2017. Answers (1)
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Give a reason why the difference in the molar heats of combustion between successive alcohols are close.
Date posted: May 25, 2017. Answers (1)
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(i) Name: I. Process A. II. Substances B and C
(ii) Explain why it is necessary to use high pressure to change gas B into the polymer.
Date posted: May 25, 2017. Answers (1)
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Give:
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(b) One industrial use of the polymer.
Date posted: May 25, 2017. Answers (1)
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Date posted: May 25, 2017. Answers (1)
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Ethane and Ethene react with bromine according to the equation given below.
(i) $C_2H_6(g) \; + \; Br_2(g) \rightarrow C_2H_5Br_2(g) + HBr(g)$
(ii) $C_2H_4(g) \; +\; Br_2(g) \rightarrow C_2H_4Br_2(l)$
Name the type of bromination reaction that takes place in: (i) and (ii).
Date posted: May 25, 2017. Answers (1)
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Date posted: May 25, 2017. Answers (1)
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The scheme below was used to prepare a cleansing agent. Study it and answer the questions that follow.
(i) What name is given to the type of cleansing agent prepared by the method shown in the scheme?
(ii) Name one chemical substance added in step II.
(iii) What is the purpose of adding the chemical substance named in (ii) above.
(iv) Name one other suitable substance that can be used in step I
(v) Give one advantage of using the cleansing agent above.
Date posted: May 25, 2017. Answers (1)
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(i) Name the reagents used in:
Step I.... Step II.. Step IV ...
(ii) Explain one disadvantage of the continued use of items made from the compound formed in step III.
Date posted: May 25, 2017. Answers (1)
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Date posted: May 25, 2017. Answers (1)
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(ii) Choose two compounds which are members of the same homologous series and explain the difference in their melting points.
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Date posted: May 25, 2017. Answers (1)
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A mixture of pentane and pentanoic acid was shaken with 0.1 M sodium hydroxide solution and let to separate as shown in the diagram below:
Name the main component in layer W.
Give a reason for the answer.
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With reference to the structure, explain how the detergent removes grease during washing
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The diagram below represents a set-up of an electrolytic cell that can be used in the production of aluminium.
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(b) Give a reason why the production of aluminium is not carried out using reduction process.
Date posted: May 19, 2017. Answers (1)
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The flow chart below shows some process involved in the industrial extraction of zinc metal.
(a) Name one ore from which zinc is extracted.
(b) Write the equation of the reaction taking place in unit II.
(c) Name two uses of zinc metal.
Date posted: May 19, 2017. Answers (1)