i)Add excess methylbenzene to the mixture in a beaker and stir. Filter to obtain sulpur as a residue.
ii)Heterogeneous. Its components can be recognized by the naked eye or through magnifying glass.
Githiari answered the question on September 13, 2017 at 02:02
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What is the importance of the shape of a conical flask?
(Solved)
What is the importance of the shape of a conical flask?
Date posted:
September 13, 2017
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Answers (1)
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Using dot and cross to represent electrons draw a diagram to illustrate bonding in the sulphide of a substance with a pH of 2.2
(Solved)
Using dot and cross to represent electrons draw a diagram to illustrate bonding in the sulphide of a substance with a pH of 2.2
Date posted:
September 10, 2017
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Answers (1)
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Study the flow chart below and answer the questions that follow.
(Solved)
Study the flow chart below and answer the questions that follow.
(i) State the conditions necessary for fermentation of glucose to take place.
(ii) State the reagent that can be used to carry out process S.
(iii) Identify gases P and T.
Date posted:
June 7, 2017
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Answers (1)
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Study the flow chart below and answer the questions that follows.
(Solved)
Study the flow chart below and answer the questions that follows.
(a) Name the process in step I.
(b) Identify the reagent in step II.
(c) Give one use of ethane.
Date posted:
June 7, 2017
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Answers (1)
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The table below shows the relative molecular masses and boiling points of pentane and ethanoic acid.
(Solved)
The table below shows the relative molecular masses and boiling points of pentane and ethanoic acid.
Explain the large difference in boiling point between ethanoic acid and pentane.
Date posted:
June 7, 2017
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Answers (1)
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The structure below represents a type of a cleansing agent.
(Solved)
The structure below represents a type of a cleansing agent.
Describe how the cleansing agent removes grease from a piece of cloth.
Date posted:
June 7, 2017
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Answers (1)
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Study the flow chart below and use it to answer the questions that follow:
(Solved)
Study the flow chart below and use it to answer the questions that follow:
(i) Identify the organic compound K.
(ii) Write the formula of M
(iii) Give one reagent that can be used in:
(I) Step I; (II) step II
Date posted:
June 7, 2017
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Answers (1)
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Study the flow chart below and answer the questions that follow.
(Solved)
Study the flow chart below and answer the questions that follow.
(i) (I) What is observation will be made in step I?
(II) Describe a chemical test that can be carried out to show the identity of compound C.
(ii) Give the names of the following: I. E II. Substance D.
Date posted:
June 7, 2017
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Answers (1)
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Study the flow chart below and answer the questions that follow.
(Solved)
Study the flow chart below and answer the questions that follow.
(i) Name the compounds:
(I) L
(II) N
(ii) Give the reagent and the condition used in step 1.
(iii) State the type of reaction that takes place in:
(I) Step 2; (II) step 3;
Date posted:
June 7, 2017
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Answers (1)
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Study the flow chart below and answer the questions that follow.
(Solved)
Study the flow chart below and answer the questions that follow.
(i) State the conditions for the reaction in Step I to occur.
(ii) Identify substance J.
(iii) State one disadvantage of the continued use of substance such as J.
Date posted:
June 7, 2017
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Answers (1)
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Ethanol obtained from glucose can be converted to ethene as shown below;
(Solved)
Ethanol obtained from glucose can be converted to ethene as shown below;
Name and describe the process that takes place in steps I and II.
Date posted:
June 7, 2017
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Answers (1)
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Propane can be changed into methane and ethane as shown in the equation below.
(Solved)
Propane can be changed into methane and ethane as shown in the equation below.
Name the process undergone by propane
Date posted:
May 25, 2017
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Answers (1)
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The flow chart below shows a series of reactions starting with ethanol. Study it and answer the questions that follow.
(Solved)
The flow chart below shows a series of reactions starting with ethanol. Study it and answer the questions that follow.
(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
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Answers (1)
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Ethane and Ethene react with bromine according to the equation given below.
(Solved)
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
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Answers (1)
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The scheme below was used to prepare a cleansing agent. Study it and answer the questions that follow.
(Solved)
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
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Answers (1)
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The structure shown below represent two cleansing agents, A and B.
(Solved)
The structure shown below represent two cleansing agents, A and B.
Which cleansing agent would be more suitable for washing in water containing magnesium sulphate? Give a reason.
Date posted:
May 25, 2017
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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:
(Solved)
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.
Date posted:
May 25, 2017
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Answers (1)
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The diagram below represents a set-up of an electrolytic cell that can be used in the production of aluminium.
(Solved)
The diagram below represents a set-up of an electrolytic cell that can be used in the production of aluminium.
(a) Give a reason why the electrolytic process is not carried out below 950oC.
(b) Give a reason why the production of aluminium is not carried out using reduction process.
Date posted:
May 19, 2017
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Answers (1)
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The flow chart below shows some process involved in the industrial extraction of zinc metal.
(Solved)
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
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Answers (1)
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The diagram below shows a simplified furnace used in the extraction of zinc. Study it and answer the questions that follow;
(Solved)
The diagram below shows a simplified furnace used in the extraction of zinc. Study it and answer the questions that follow;
(i) Name two other substances that are also introduced in the furnace together with roasted ore.
(ii) In which physical state is zinc at point Y in the furnace? Give a reason.
(iii) Suggest a value for the temperature at point X in the furnance. Give a reason
Date posted:
May 19, 2017
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Answers (1)