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  • kcse form 2 mathematics questions

KCSE Chemistry Q & A - MODEL 1997.PP2.QN.6

15/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


(a) The diagram below represents a set up that was used to obtain dry nitrogen from air. Study it and answer the questions that follow
The diagram below represents a set up that was used to obtain dry nitrogen from air. Study it and answer the questions that follow
  • (i) Name solid Q
  • (ii) What is the purpose of sodium hydroxide?
  • (iii) Write an equation for the reaction which took place in tube P
    ​Give the name of one impurity present in the nitrogen gas  obtained
  • (iv) Give a reason why liquid  nitrogen is used  for storage of semen for  artificial insemination
(b) The set up below was used to prepare  nitric acid
The set up below was used to prepare nitric acid
  • (i) Give the name  of liquid R
  • (ii) Write an equation for the reaction which took place in the glass retort
  • (iii) Explain the following
    I.  Nitric acid is stored in dark bottles
    II. The reaction between copper metal with 50% nitric acid (one volume of acid added to an equal volume of water) in an open test tube gives brown fumes.
​(c) A factory uses nitric acid and ammonia gas as the only reactants for the preparation of fertilizer. If the daily production of the fertilizer is 4800 kg calculate the mass of ammonia gas used daily.
Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP2.QN.5

15/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


The reaction between and methanoic acid at 300C proceeds according to the information given below

Picture

(a) On the grid below, plot a graph of concentration of Bromine (Vertical axis against time)

(b) From the graph determine:

(i) The concentration of bromine at the end of 3 minutes

(ii) The rate of reaction at time ‘t’ where t = 1 ½ minutes

(c) Explain how the concentration of bromine affects the rate of reaction

(d) On the same axis sketch the curve that would be obtained if the reaction was carried out at 200C and label the curve as curve II. Give a reason for your answer.

Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP2.QN.3

14/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


(a) Study the information below and answer the questions that follow:
      The letters do not represent the actual symbols of the elements
Study the information below and answer the questions that follow:
  • (i) Which elements are metals? Give  a reason
  • (ii) Write  the formula of the compound formed when element H reacts  with  elements  K
  • (iii) Explain why the melting point  of  J is higher than that of K
  • (iv) What is the  oxidation state  of J in its chloride
  • (v) How does the:
    I – Melting point of fluoride of G compare with that of its chloride?
    ​II- Reactivity of H and L with water compare? Give an explanation (2mks)
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KCSE Chemistry Q & A - MODEL 1997.PP2.QN.4

14/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


(a) The diagram below  shows the extraction of sodium metal using the downs cell. Study it answer the questions that follow
Picture
  • (i)Explain why in this process the sodium chloride is mixed with calcium chloride.
  • (ii)Why is the anode made of graphite and not steel?
  • (iii)State two properties of sodium metal that make  it possible for it to be collected as shown in the diagram
  • (iv)What is the function of the steel gauze cylinder?
  • (v)Write ionic equations for the reactions which take  place at:
    • I Cathode
    • II Anode
  • (vi)Give one industrial use  of sodium  metal
(b)Explain why the sodium  metal is kept stored under kerosene
Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP2.QN.2

13/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


(a) Give the names of the following compounds
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​(b) Study the information in the table below and answer the questions that follow
Picture
  • (i) Write the general formula of the  hydrocarbon  in the table
  • (ii) Predict the relative  atomic mass  of the hydrocarbon with 5 carbon atoms
  • (iii) Determine  the molecular formula of the  hydrocarbon in (ii) above  and draw its structural formula (H = 1.0 C= 12.0)
(c) Study the scheme given above and answer the questions that follow
Picture
​(i) Name the  reagents used in:
Step I …………………….
Step II ……………………..
Step III ……………………..
(ii) Write an equation for the complete combustion of CH = CH
(iii) Explain one disadvantage  of the continued  use of items made from the compound formed  in step III
Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP2.QN.1

13/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


  1. Use standard electric potentials for elements A, B,C, D  and F given below to answer the questions that follow.
Picture

(i) Which element is likely to be hydrogen? Give a reason for your answer

(ii) What is the Eθ value of the strongest reducing agent?

(iii) In the space provided draw a labeled diagram of the electrochemical cell that would be obtained when half – cells of elements B and D are combined

(iv) Calculate the Eθ value of the electrochemical cell constructed in (iii) above

(b) During the electrolysis of aqueous copper (II) sulphate using copper electrodes, a current of 0.2 amperes was passed through the cell for 5 hours

(i) Write an ionic equation for the reaction that took place at the anode

(ii) Determine the change in mass of the anode which occurred as a result of the electrolysis process (Cu= 63.5, 1 Faraday = 96,500 coulombs).

Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.24

12/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


Aqueous potassium sulphate was electrolysed using platinum electrodes in a cell.

a) Name the products formed at the cathode and anode. Anode

b) How does the concentration of the electrolyte change during electrolysis.

c) Why would it not be advisable to electolyse aqueous potassium sulphate using potassium metal electrodes.

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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.22

12/10/2020

Comments

 

KCSE Chemistry 1997 Topical Questions and Answers

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


In an experiment to separate a mixture of two organic liquids, liquid M (b.p 560C) And liquid (b.p. 1180C), a student set up the apparatus shown below

In an experiment to separate a mixture of two organic liquids
  • a) Identify two mistakes in the set – up
  • b) What method would the student use to test the purity of the distillates obtained?
Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.23

12/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


​An element Y has the electronic configuration 2.8.5
  • a) Which period of the periodic table does the element belong?
  • b) Write a formula of the most stable anion formed when element Y ionizes
  • c) Explain the difference between the atomic radium of element Y and its ionic radius.
Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.19

11/10/2020

Comments

 

KCSE Chemistry 1997 Topical Questions and Answers

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


90cm3 of 0.01M calcium hydroxide were added to a sample of water containing 0.001 moles of calcium hydrogen carbonate.

a) Write an equation for the reaction which took place

b) Calculate the number of moles of calcium ions in 90cm3 of 0.01M calcium hydroxide.

c) What would be observed if soap solution was added drop wise to a sample of the water after the addition of calcium hydroxide? Give a reason.

Expected response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.16

11/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


A gas occupies a volume of 400cm3 at 500k and 1 atmosphere pressure. What will be the temperature of the gas when the volume and pressure of the gas is 100cm3 and 0.5 atmospheres respectively.

Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.17

11/10/2020

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KCSE Chemistry 1997 Topical Questions and Answers

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


In an equation below, identify the reagent that acts as abase. Give a reason.

H2O(aq) + H2O(l) →  H3O(aq) + HO2-(aq)

Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.20

11/10/2020

Comments

 

KCSE Chemistry 1997 Topical Questions and Answers

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


When 0.6g of element J were completely burnt in oxygen and all the heat evolved was used to heat 500cm3 of water, the temperature of the water rose from 230C to 320C.

Calculate the relative atomic mass of element J given that the specific heat capacity of water = 4.2JK-1g-1, density of water = 1.0g/cm3 and molar heat is combustion of J is 380Kjmol-1

Expected Response
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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.9

10/10/2020

Comments

 

KCSE Chemistry 1997 Topical Questions and Answers

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


​Potassium sulphite solution was prepared and divided into two portions. The first portion gave a white precipitate when reacted with barium nitrate. On addition of dilute hydrochloric acid the white precipitate disappeared.

a) Write the formula of the compound which formed as the white precipitate.

b) Write the equation for the reaction between dilute hydrochloric acid and the compound whose formula is written in (a) above.

c) What observation would be made if one drop of potassium dichromate solution was added to the second portion followed by dilute hydrochloric acid?

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KCSE Chemistry Q & A - MODEL 1997.PP1.QN.14

10/10/2020

Comments

 

KCSE Chemistry 1997 Topical Questions and Answers

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


​In an experiment, chlorine gas was passed into moist hydrogen sulphide contained in a boiling tube as shown in the diagram
Picture
​a) What observation was made in the boiling tube?
b) Write an equation for the above reaction.
c) What precaution should be taken in carrying out this experiment? Give a reason.
Expected Response
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    chemistry topical questions and answers for kcse exams

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