CHEMISTRY TOPICAL QUESTIONS AND ANSWERS - ATIKA SCHOOL

KCSE Chemistry Topical Questions and Answers Dashboard since 1995

1/1/2025

These are chemistry questions and answers categorized according to topics, papers i.e. Paper 1 and 2, Levels i.e. form 1 to form 4, kcse year the examination was done and section A or B
Select topic/category to open topical questions from that particular option provided.

Chemistry Topics

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A

KCSE Chemistry Topical Questions and Answers Dashboard since 1995

C

E

F

G

Gas Laws

I

Introduction To Chemistry

K

M

Metals

N

Nitrogen And Its Compounds

O

P

R

S

T

The Mole

W

Water And Hydrogen

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.26

25/11/2020

KCSE Chemistry 2018 Topical Questions and Answers

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

Explain why commercial indicators are preferred to flower exacts as acid-base indicators.

ANSWERS

The composition of commercial indicators remains constant. hence gives consistent results.
The composition of flower extracts change with time giving inconsistent results.

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.5

24/11/2020

KCSE Chemistry 2018 Topical Questions and Answers

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

Describe an experiment to show that group one elements react with cold water to form alkaline Solutions

ANSWERS

Place a small piece of sodium metal on water in a trough.
When the reaction stops, drop a strip of red litmus paper to the resulting solution.
The red litmus paper turns blue showing that the resulting solution is alkaline

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.1

24/11/2020

KCSE Chemistry 2018 Topical Questions and Answers

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

(a) Define a soluble base.
(b) Aqueous solutions of 2M ethanoic acid and 2M nitric(V) acid were tested for electrical conductivity. Which solution is a better conductor of electricity? Explain.

ANSWERS

(a)A soluble base is a substance that dissociates in water to produce hydroxide ions as the only negative ions.
(b)Nitric(V) acid.
This is because nitric(V) acid is a strong acid and dissociates completely in solution producing many H+ ions.

K.C.S.E Chemistry Q & A-MODEL 2017.PP2.Q N.4

23/11/2020

KCSE Chemistry 2017 Topical Questions and Answers

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

W is a colourless aqueous solution with the following properties:

I It turns blue litmus paper red.
II On addition of cleaned magnesium ribbon, it gives off a gas that burns with a pop sound.
III On addition of powered sodium carbonate, it gives off a gas which forms a precipitate with calcium hydroxide solution.
IV When warmed with copper(II) oxide powder, a blue solution is obtained but no gas is given off
V On addition of aqueous barium chloride, a white precipitate is obtained.

(a) (i) State what properties (I) and (III) indicate about the nature of W.
(ii) Give the identity of W.
(iii) Name the colourless solution formed in (II) and (III).
(iv) Write an ionic equation for the reaction indicated in (V).
(b) Element V conducts electricity and melts at 933K. When chlorine gas is passed over heated V, it forms a vapour that solidifies on cooling. The solid chloride dissolves in water to form an acidic
solution. The chloride vapour has a relative molecular mass of 267 and contains 19.75% of V. At a higher temperature, it dissociates to a compound of relative molecular mass 133.5. When aqueous
sodium hydroxide is added to the aqueous solution of the chloride, a white precipitate is formed which dissolves in excess alkali. (V = 27.0 ; CI = 35.5)
(i) Determine the:

I empirical formula
II molecular formula

(ii) Draw the structure of the chloride vapour and label the bonds.
(iii) Write an equation for the reaction that form a white precipitate with sodium hydroxide.

ANSWERS

K.C.S.E Chemistry Q & A-MODEL 2017.PP1.Q N.14

23/11/2020

KCSE Chemistry 2017 Topical Questions and Answers

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

Using the elements chlorine, calcium and phosphorus:
(a) Select elements that will form an oxide whose aqueous solution has a pH less than 7.
(b) Write an equation for the reaction between calcium oxide and dilute hydrochloric acid.
(c) Give one use of calcium oxide.

ANSWERS

K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.23

20/11/2020

KCSE Chemistry 2016 Topical Questions and Answers

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

Given the following substances: wood ash, lemon juice and sodium chloride.
(a) Name one commercial indicator that can be used to show whether wood ash, lemon juice and sodium chloride are acidic, basic or neutral.
(b) Classify the substances in 15(a) above as acids, bases or neutral.

ANSWERS

(a) Litmus
Phenolphthalein indicator
(b) Wood ash- Basic
Lemon Juice - acidic
Sodium Chloride- neutral

KCSE Chemistry Q & A - MODEL 2019.PP1.QN.16

18/11/2020

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)Complete the following table. (2 marks)

(b) Explain why a solution of ammonia in methylbenzene has no effects on red litmus paper while in aqueous ammonia red litmus paper turns blue. (1 mark)

Expected Response

K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.15

17/11/2020

KCSE Chemistry 2015 Topical Questions and Answers

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

Given the following substances: wood ash, lemon juice and sodium chloride.
(a) Name one commercial indicator that can be used to show whether wood ash, lemon juice and sodium chloride are acidic, basic or neutral.
b) Classify the substances in 15(a) above as acids, bases or neutral

ANSWERS

(a) Universal indicator / litmus paper
(b) Acid, base, neutral.

KCSE Chemistry Q & A - MODEL 2019.PP1.QN.6

16/11/2020

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 farmer intended to plant cabbages in his farm. He first tested the pH of the soil and found it to be 3.0. If cabbages do well in alkaline soils, explain the advice that would be given to the farmer in order to realise a high yield. (2 marks)

Expected Response

K.C.S.E Chemistry Q & A - MODEL 2014.PP1.QN.27

15/11/2020

KCSE Chemistry 2014 Topical Questions and Answers

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

a) Name a suitable solvent for extracting an indicator form flowers:
b) Give a reason why the solvent named in (a) above is used

ANSWERS

(a) Acetone / ethanol / propanone / propanol.
(b) The solvent dissolves the organic compound indicator present in the flowers / it is an organic solvent.

KCSE Chemistry Q & A - MODEL 2001.PP1.QN.26

14/11/2020

KCSE Chemistry 2001 Topical Questions and Answers

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

The Ph of a sample of soil was found to be 5.0.An agricultural office recommended the addition of calcium oxide in the soil. State two functions of the calcium oxide in the soil.

Expected Response

KCSE Chemistry Q & A - MODEL 2001.PP1.QN.8

10/11/2020

KCSE Chemistry 2001 Topical Questions and Answers

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

10gm of sodium hydrogen carbonate were dissolved in 20cm³ of water in a boiling tube. Lemon juice was then added drop wise with shaking until there was no further observable change.

a) Explain the observation, which was made in the boiling tube when the reaction was in progress
b) What observation would have been made if the lemon juice had been added to copper turnings in a boiling tube? Give reason?

Expected Response

KCSE Chemistry Q & A - MODEL 2000.PP2.QN.7

8/11/2020

KCSE Chemistry 2000 Topical Questions and Answers

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

(a) A student was supplied with a colourless liquid suspected to be water

(i) Describe one chemical test that could have been used to show that the liquid was water
(ii) How could it have been shown that the liquid was pure water?

The flow chart below shows the various stages of water treatment. Study it and answer the questions that follow

The flow chart below shows the various stages of water treatment

(i) Which substances are likely to be removed in filtration unit I?
(ii) What is the name of the process Y?
(iii) What is the purpose?

I Process Y
II Addition of sodium hypochlorite
(c) It was confirmed that magnesium sulphate was present in the tap water

(i) What type of hardness was present in the water?
(ii) Explain how the hardness can be removed

Expected Response

KCSE Chemistry Q & A - MODEL 2000.PP1.QN.6

3/11/2020

KCSE Chemistry 2000 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 metal, describe how a solid samples of copper (II) carbonate can be prepared.

Expected Response

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