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  • kcse form 2 mathematics questions

KCSE Chemistry Q & A - MODEL 2019.PP2.QN.7

21/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​(a) What is meant by rate of reaction. (1 mark)
(b) In the space provided, sketch the diagram of a set-up that can be used to determine the rate of reaction between manganese(IV) oxide and hydrogen peroxide. (3 marks)
​(e) A student placed a small amount of liquid bromine at the bottom of a sealed gas jar of air as shown in Figure 4.
A student placed a small amount of liquid bromine at the bottom of a sealed gas jar of air as shown in Figure 4
​(i) Describe what will be observed: (1 mark)
     I. after two minutes .
     II. after 30 minutes 
​(ii) Use the Kinetic theory to explain the observations: (2 marks)
      I. after 2 minutes .
      II. after 30 minutes 
(d) Some plants have seeds that contain vegetable oil.
  • (i) Describe how the oil can be obtained from the seeds. (3 marks)
  • (ii) Explain how it could be confirmed that the liquid obtained from the seeds is oil. (1 mark)
Expected Response
​(a) What is meant by rate of reaction. (1 mark) (b) In the space provided, sketch the diagram of a set-up that can be used to determine the rate of reaction between manganese(IV) oxide and hydrogen peroxide. (3 marks)
​(a) What is meant by rate of reaction. (1 mark) (b) In the space provided, sketch the diagram of a set-up that can be used to determine the rate of reaction between manganese(IV) oxide and hydrogen peroxide. (3 marks)

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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.6

21/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​(a) What is meant by standard electrode potential of a an element? (1 mark)
​(b) use the standard electrode potentials given below to answer the questions that follow.
use the standard electrode potentials given below to answer the questions that follow

(i) State whether acidified MnO4- can oxidise M2+. Give a reason. (2 marks)

(ii) Select two half-cells which when combined will give the highest e.m.f. (1 mark)

(iii) Write the cell representation for the cell formed in b (ii). (I mark)

(iv) Calculate the E0 value for the cell formed in b (iii). (2 marks)


(c) A mass of 1.24g of a divalent metal was deposited when a current of 6A was passed through a solution of the metal sulphate for 12 minutes. Determine the relative atomic mass of the metal.

(1 Faraday = 96,500 C mol-1 (3 marks)

(d) State two applications of electrolysis. (I mark)

Expected Response
(a) What is meant by standard electrode potential of an element (1 mark) (b) Use the standard electrode potentials given below to answer the questions that follow. (i) State whether acidified MnO-4 can oxidise M2+. Give a reason. (2 marks) (ii) Select two half-cells which when combined will give the highest e.m.f. (1 mark) (iii) Write the cell representation for the cell formed in b (ii). (1 mark) (iv) Calculate the Eθ value for the cell formed in b (iii). (1 mark) (c) A mass of 1.24g of a divalent metal was deposited when a current of 6A was passed through a solution of a metal sulphate for 12 minutes.Determine the relative atomic mass of the metal( Faraday = 96,500 C mol -1 (3 mark) (d) State two application s of electrolysis. (I mark)
(a) What is meant by standard electrode potential of an element (1 mark) (b) Use the standard electrode potentials given below to answer the questions that follow. (i) State whether acidified MnO-4 can oxidise M2+. Give a reason. (2 marks) (ii) Select two half-cells which when combined will give the highest e.m.f. (1 mark) (iii) Write the cell representation for the cell formed in b (ii). (1 mark) (iv) Calculate the Eθ value for the cell formed in b (iii). (1 mark) (c) A mass of 1.24g of a divalent metal was deposited when a current of 6A was passed through a solution of a metal sulphate for 12 minutes.Determine the relative atomic mass of the metal( Faraday = 96,500 C mol -1 (3 mark) (d) State two application s of electrolysis. (I mark)

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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.5

21/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​(a) What ¡s meant by molar heat of neutralisation? (1 mark)

(b) In an experiment to determine the molar heat of neutralisation, 50 cm3 of 1M hydrochloric acid was neutralised by adding 10 cm3 portions of dilute sodium hydroxide. During the experiment, the data in Table 1 was obtained.

During the experiment, the data in Table 1 was obtained
  • (i) Write the equation for the reaction in this experiment. (1 mark)
  • (ii) On the grid provided, plot a graph of temperature (Y-axis) against volume of sodium hydroxide (X-axis) added. (3 marks)
On the grid provided, plot a graph of temperature (Y-axis) against volume of sodium hydroxide (X-axis) added

(iii) Determine from the graph the:

I. volume of sodium hydroxide which completely neutralises 50 cm3 of 1M hydrochloric acid. (1 mark)

II. change in temperature,△T, when complete neutralisation occurred. (1 mark)

(iv) Calculate:

I. the heat change, △H when complete neutralisation occurred.

(Specific heat capacity = 4.2 Jg-1K-1, density of solution 1.0 gcm-3) (2 marks)

II. molar heat of neutralisation of hydrochloric acid with sodium hydroxide. (1 mark)

(v) How would the value of molar heat differ if 50 cm3 of 1M ethanoic acid was used instead of 1M hydrochloric acid? Give a reason. (2 marks)

Expected Response
(a) What is meant by a molar heat of neutralisation? (1 marks) (b) In an experiment to determine the molar heat of neutralisation, 50 cm3 of IM hydrochloric acid was neutralised by adding 10 cm3 Onions Of dilute sodium hydroxide. During the experiment, the data in Table 1 was obtained. (i) Write the equation for the reaction in this experiment. (1 mark)
(i) Write the equation for the reaction in this experiment. (1 mark) (ii) On the grid provided, plot a graph of temperature (Y-axis) against volume of sodium hydroxide (X-axis) added. (3 marks)
I. volume of sodium hydroxide which completely neutralises 50 cm3 of lM hydrochloric acid. (1 mark) II. change in temperature, AT, when complete neutralisation occurred. (1 mark) (III) Calculate: I. The heat change, dH when complete neutralisation occurred. (Specific heat capacity = 4.2 Jg-1 K-1 density of solution 1.0 gcm-3)(2 marks) (v) How would the value of molar heat differ if 50 cm3 of lM ethanoic acid was used instead of IM hydrochloric acid? Give a reason. (2 marks)
I. volume of sodium hydroxide which completely neutralises 50 cm3 of lM hydrochloric acid. (1 mark) II. change in temperature, AT, when complete neutralisation occurred. (1 mark) (III) Calculate: I. The heat change, dH when complete neutralisation occurred. (Specific heat capacity = 4.2 Jg-1 K-1 density of solution 1.0 gcm-3)(2 marks) (v) How would the value of molar heat differ if 50 cm3 of lM ethanoic acid was used instead of IM hydrochloric acid? Give a reason. (2 marks)

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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.2

20/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​(a) Zinc occurs mainly as zinc blende. Name one other ore from which Zinc can be extracted. (1 mark)
(b) The flow chart in Figure 2 shows the various stages in the extraction of zinc metal. Study it and answer the questions that follow.
The flow chart in Figure 2 shows the various stages in the extraction of zinc metal. Study it and answer the questions that follow.
  • (i) Write an equation for the reaction which occurs in the roasting chamber. (1 mark)
  • (ii) Describe the process that takes place in the blast furnace. (3 marks)
  • (iii) Explain why molten lead is added to the condenser. (1 mark)
  • (iv) State two uses of zinc. (1 mark)
  • (v) Give one reason why the extraction of zinc causes pollution to the environment. (1 mark)
​(c) Explain the observations made when zinc metal is added to hot sodium hydroxide. (2 marks)
Expected Response
​(a) Zinc occurs mainly as zinc blende. Name one other ore from which Zinc can be extracted. (1 mark) (b) The flow chart in Figure 2 shows the various stages in the extraction of zinc metal. Study it and answer the questions that follow.
(i) Write an equation for the reaction which occurs in the roasting chamber. (1 mark) (ii) Describe the process that takes place in the blast furnace. (3 marks) (iii) Explain why molten lead is added to the condenser. (1 mark) (iv) State two uses of zinc. (1 mark) (v) Give one reason why the extraction of zinc causes pollution to the environment. (1 mark)

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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.3

20/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​Figure 3 is a flow chart that shows the process that occurs in the manufacture of  nitric (V) acid.
​Figure 3 is a flow chart that shows the process that occurs in the manufacture of nitric (V) acid.
(a) Name substance P, Q, R and S.
  • P ……………………………………………..  (1 mark)
  • Q ……………………………………………. (1 mark)
  • R ………………………………………………. (1 mark)
  • S ……………………………………………….. (1 mark)

​To obtain substance R, ammonia is heated at 9000C in the presence of air and a catalyst.

The product is then cooled in air.
  • (i) Name the catalyst for the reaction. (1 mark)
  • (ii) Write the equations for the two reactions described in (b). (2 marks)
  • (iii) Other than nitric(V) acid, name another product that is formed. (1 mark)
(e) When ammonia ¡s reacted with nitric(V) acid, it produces a nitrogenous fertiliser.
  • (i) Explain why fertilisers play a major role in food production. (2 marks)
  • (ii) State two problems associated with the use of nitrogenous fertilisers. (2 marks)
Expected Response
​Figure 3 is a flow chart that shows the process that occurs in the manufacture of nitric (V) acid. (a) Name substance P, Q, R and S. P........................... (1 marks) Q.............................. (1 marks) R................................(1 marks) S..................................(1 marks) (b) To obtain substance R, ammonia is heated at 900 °C in the presence of air and a catalyst. The product is then cooled in air. (i) Name the catalyst for the reaction. (1 marks) (ii) Write the equations for the two reactions described in (b). (2 marks) (iii) Other than nitric(V) acid, name another product that is formed. (1 mark) (c) When ammonia is reacted with nitric(V) acid, it produces a nitrogenous fertiliser. (i) Explain why fertilisers play a major role in food production. (2 marks) (ii) State two problems associated with the use of nitrogenous fertilisers. (2 marks)
​Figure 3 is a flow chart that shows the process that occurs in the manufacture of nitric (V) acid. (a) Name substance P, Q, R and S. P........................... (1 marks) Q.............................. (1 marks) R................................(1 marks) S..................................(1 marks) (b) To obtain substance R, ammonia is heated at 900 °C in the presence of air and a catalyst. The product is then cooled in air. (i) Name the catalyst for the reaction. (1 marks) (ii) Write the equations for the two reactions described in (b). (2 marks) (iii) Other than nitric(V) acid, name another product that is formed. (1 mark) (c) When ammonia is reacted with nitric(V) acid, it produces a nitrogenous fertiliser. (i) Explain why fertilisers play a major role in food production. (2 marks) (ii) State two problems associated with the use of nitrogenous fertilisers. (2 marks)

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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.4

20/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


(a) Explain the following observations:
  • (i) The colour of aqueous copper(II) sulphate fades when a piece of magnesium metal is dropped into the solution. (2 marks)
  • (ii) Apiece of iron bar is coated with a brown substance when left in the open on a rainy day. (2 marks)

(b) A sample of water is suspected to contain aluminium ions (AI3+) . Describe a laboratory experiment that can be carried out to show that AI3+ ions are present in the water sample. (3 marks)

(c) In an experiment to determine the number of moles of water of crystallisation of a hydrated compound, Na2S04. X H2O, 5g of the compound were heated strongly to a constant mass.

  • (i) Explain how a constant mass was obtained. (2 marks)
  • (ii) During the experiment, the mass of the residue was found to be 2.205 g. Determine the number of moles of water of crystallisation in the compound. (Na=23.0;O= 16.0;S=32.0;H= 1.0) (3 marks)
Expected Response
(a) Explain the following observations: (i) The colour of aqueous copper(ii) sulphate fades when a piece of magnesium metal is dropped into the solution. (2 marks) (ii) A piece of iron bar is coated with a brown substance when left in the open on a rainy day. (2 marks) (b) A sample of water is suspected to contain aluminium ions (Al3+) . Describe a laboratory experiment that can be carried out to show that Al3+ ions are present in the water sample. (3 marks)
(c) In an experiment to determine the number of moles of water of crystallisation of a hydrated compound Na2SO4.XHsO,5g of the compound were heated strongly to a constant mass. (i) Explain how a constant mass was obtained. (2 marks) (ii) During the experiment, the mass of the residue was found to be 2.205 g. Determine the number of moles of water of crystallisation in the compound. (Na = 23.0 ; O = 16.0 ; S = 32.0 ; H = 1.0) (3 marks)

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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.1

20/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


1.
(a) Alkanes are said to be saturated hydrocarbons.
  • (i) What is meant by saturated hydrocarbons. (1 mark)
  • (ii) Draw the structure of the third member of the alkane homologous series and name it. (2 marks)
(b) When the alkane, hexane, is heated to high temperature, one of the products is ethene.
  • (i) Write the equation for the reaction. (1 mark)
  • (ii) Name the process described in (b). (1 mark)
(c) Study the flow chart in Figure 1 and answer the questions that follow.
Study the flow chart in Figure 1 and answer the questions that follow
  • (i) Identify A. (1 mark)
  • (ii) State one physical property of B. (1 mark)
  • (iii) Draw the structure of D. (1 mark)
  • (iv) Give a reason why D pollutes the environment. (1 mark)
  • ​(iv) Give a reason why D pollutes the environment. (1 mark)
  • (v) Write an equation for the formation of F. (1 mark)
(d) Describe an experiment which can be used to distinguish butene from butanol. (2 marks)
Expected Response
(a) Alkanes are said to be saturated hydrocarbons. (i) What is meant by saturated hydrocarbons. (1 mark) (ii) Draw the structure of the third member of the alkane homologous series and name it. (2 marks) (b) When the alkane, hexane, is heated to high temperature, one of the products is ethene. (i) Write the equation for the reaction. (1 marks) (ii) Name the process described in (b). (1 marks) (c) Study the flow chart in Figure 1 and answer the questions that follow. (i) Identify A. (1 marks) (ii) State one physical property of B. (1 marks) (iii) Draw the structure of D. (1 marks)
(iv) Give a reason why D pollutes the environment. (1 marks) (v) Write an equation for the formation of F.(1 marks) (d) Describe an experiment which can be used to distinguish butene from butanol. (2 marks)

Related Chemistry Questions and Answers on Organic Chemistry II Form  3  Level

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.28

20/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​Name an appropriate apparatus that is used to prepare standard solutions in the laboratory.     (1 mark)
Expected Response
​volumetric flask

​Related Chemistry Questions and Answers on Simple Classification of Substances Form  1  Level

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.27

20/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​Draw in the space provided a labelled diagram of the set-up of the apparatus that can be used to  electrolyse molten Lead (II) bromide.   (3 marks)
Expected Response
Picture
Picture

​​Related Chemistry Questions and Answers on Effects of Electric Current on Substances Form  2  Level

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.27

19/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


When burning magnesium ribbon is introduced into a gas jar full of nitrogen, it continues to burn producing a greenish yellow powder.
  • (a) Write an equation for the reaction between nitrogen and magnesium. (1 mark)
  • (b) Explain why magnesium continues to burn in nitrogen but sulphur does not. (2 marks)
  • (c) State one use of nitrogen. (1 mark)
Expected Response
Picture

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.26

19/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


140cm3 of nitrogen gas diffuses through a membrane in 70 seconds. Flow long will it take 200cm3 of carbon(IV) oxide gas to diffuse through the same membrane under the same conditions of temperature and pressure. (3 marks)

Expected Response
Picture
Picture

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.25

19/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Chemical tests were carried out on separate samples of water drawn from the same source. The observations made were recorded as shown in Table 4.
Picture
State the inferences made in reactions:
  • (i) ………………………...(1 mark)
  • (ii) ………………………..(1 mark)
  • (iii) ……………………...(1 mark)
Expected Response
Picture

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.24

19/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​Starting with copper turnings. describe how a sample of copper(II) sulphate crystals can be prepared in the laboratory. (3 marks)
Expected Response
Picture

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.23

19/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Picture
​are isotopes of element X. They occur naturally in the ratio of 9:1 respectively.
Calculate the relative atomic mass of element X. (2 marks)
Expected Response
Picture

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.22

19/11/2020

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KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​The diagram in Figure 6 Shows radiations emitted by a radioactive sample.
Picture
  • (a) Identify radiations:
    • (i)   M …………….(1 mark)
    • (ii)  N ……………...(1 mark)
  • (b) Explain what would happen when a sheet of paper is placed in the path of the two radiations. (1 mark)
Expected Response
Picture

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    chemistry topical questions and answers for kcse exams

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