CHEMISTRY TOPICAL QUESTIONS AND ANSWERS

K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.19

29/9/2020

KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

(a) State what would happen when a few drops of dilute hydrochloric acid are added to the mixture at equilibrium
(b) Give a reason for your answer in (a) above

answer

(a) Solid dissolves
(b) addition of hydrochloric acid favour backward reaction

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.18

29/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

Describe how a solid sample of Zin (II) carbonate can be prepared starting with zinc oxide

ANSWER

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.17

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

The structures below represents a portion of a polymer
(a) Give the name of the polymer
(b) Give one industrial use of the polymer

answer

a) Perspex
b) As a substitute for glass in the manufacture of
- safety screens
- plastic lenses
- Wind screen Accept any other correct use.

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.16

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

With reference to iodine, distinguish between covalent bonds and Van Der Waals forces

answers

Covalent bonds exist between two iodine atoms in an iodine molecule white Van der waals forces exists between two or more molecules of iodine (1) covalent bonds are strong than Van der walls forces

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.15

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

When carbon dioxide gas was passed through aqueous calcium hydroxide a white suspension was formed
(a) Write an equation for the reaction that took place
(b) State and explain the changes that would occur when carbon dioxide gas is bubbled through the white suspension

answers

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.14

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

Iron is extracted from its ore by the blast furnace process
(a) Name one ore from which iron is extracted
(b) One of the impurities in iron is removed in the form of calcium silicate. Write an equation for the reaction in which calcium silicate is produced

answers

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.13

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

Use the equations below to answer the questions that follow

answers

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.12

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

Concentrated nitric (V) acid was added to iron (II) sulphate acidified with sulphuric acid and the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.

answer

Concentrated nitric acid is a strong oxidizing agent . It oxidizes pale iron (II) to yellow iron (III) and it is reduced to nitrogen dioxide which is brown

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.11

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

In an experiment, sulphur dioxide gas was bubbled into water followed by chlorine gas. The resulting clear solution gave a white precipitate when mixed with a acidified barium chloride solution. Explain these observations

ANSWER

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.10

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

The graph below represents a radioactive decay series for isotope H. Study it and answer the questions that follow

(a) Name the type of radiation emitted when isotope H changes to isotope J.
(b) Write an equation for the nuclear reaction that occur when isotope J changes to isotope K

ANSWERS

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.9

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

Use the reactions given below to answer the questions that follow. The letters do not represent the actual symbols of the elements

(a) What name is given to the type of reaction given above?
(b) Arrange the elements D, E, F and G in the order of their reactivity starting with the most reactive
(c) Complete the equation below

answers

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.8

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

The apparatus shown below was set to prepare and collect hydrogen sulphide

(a) Name solid C
(b) Give a reason why warm water is used
(c) What observation would be made if hydrogen sulphide gas was bubbled into a solution of lead II nitrate?

answers

(a) C2 = FeS, ZnS
(b) It is soluble in cold water
(c) it turns black

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.7

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

State and explain how the rate of reaction between zinc granules and steam can be increased

answer

Use zinc powder ,
which has a larger surface area

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.6

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

When potassium nitrate is heated, it produces potassium nitrate and gas C
(a) Identify gas C
(b) Name the type of reaction undergone by the potassium nitrate

answer

(a) Oxygen
(b) Decomposition

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K.C.S.E Chemistry Q & A - MODEL 2002.PP1.QN.5

28/9/2020

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

(a) Write the electronic configuration of calcium ( atomic number 20 ) and beryllium (atomic number 4)
(b) Why is calcium more reactive than beryllium

answers

(a) calcium 2.8.8.2
Beryllium 2.2
(b) Both elements are in the same group but the two valence electrons of calcium are further away They are not strongly held by the nucleus, hence are readily released.

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

19

KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

12

KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

10

KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

8

KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

7

KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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KCSE Chemistry 2002 Topical Questions and Answers

All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

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