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  • kcse form 2 mathematics questions

KCSE Chemistry Topical Questions and Answers Dashboard since 1995

1/1/2025

Comments

 
​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

Vertical Divider

A

  1. All
  2. Acid Bases And Indicators
  3. Acids Bases And Salts
  4. Air And Combustion
  5. Alkaline
KCSE Chemistry Topical Questions and Answers Dashboard since 1995

C

  1. Carbon And Its Compounds
  2. Chemical Families
  3. Chlorine And Its Compounds

E

  1. Electric Current On Substance
  2. Electrochemistry I And Ii
  3. Energy Changes In Chemical And Physical Processes

F

  1. Form 1 Level
  2. Form 2
  3. Form 3
  4. Form 4

G

  1. Gas Laws

I

  1. Introduction To Chemistry

K

  1. Kcse-1995
  2. Kcse-1996
  3. Kcse-1997
  4. Kcse-1998
  5. Kcse 1999
  6. Kcse-2000
  7. Kcse-2001
  8. Kcse-2002
  9. Kcse-2003
  10. Kcse-2004
  11. Kcse2005
  12. Kcse-2005
  13. Kcse-2006
  14. Kcse2007
  15. Kcse-2007
  16. Kcse-2008
  17. Kcse-2009
  18. Kcse-2010
  19. Kcse-2011
  20. Kcse-2012
  21. Kcse-2013
  22. Kcse-2014
  23. KCSE 2015
  24. KCSE 2016
  25. KCSE 2017
  26. KCSE 2018
  27. Kcse 2019

M

  1. Metals

N

  1. Nitrogen And Its Compounds

O

  1. Organic Chemistry I
  2. Organic Chemistry II

P

  1. Paper 1
  2. Paper 2

  1. Periodictable
  2. Properties-and-trends-across-the-period

R

  1. Radioactivity
  2. ​Reaction Rates And Reversible Reactions

S

  1. Salts
  2. Simple Classification Of Substances
  3. Structure Of The Atom And The Periodic Table
  4. Structures And Bonding
  5. Sulphur And Its Compounds

T

  1. The Mole

W

  1. Water And Hydrogen
Comments

Name one chief ore of copper and give its formula

11/10/2021

Comments

 

​a) Name one chief ore of copper and give its formula (2mks)

Copper pyrites -CuFeS2 (any one 1mk)

Cuprite – Cu2O2

​Calculate the mass of copper that would be deposited on the cathode when a steady current of one ampere flows for 20 minutes through copper (II) sulphate solution (Cu = 63.5; Faraday Constance = 96500Cmol-1) (3mks)

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.24

25/11/2020

Comments

 

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) Name two ores of iron. 
(b) Describe how the amount of iron in a sample of iron(III) oxide can be determined. 
ANSWERS
(a) Haematite;
 Magnetite;
 Siderite.
(b)  Weigh the iron (III) oxide together with a crucible;
 Heat the Iron(III) oxide and coke to a constant mass;
 Cool and re-weigh residue and crucible
 The difference in mass is weight of the iron.

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K.C.S.E Chemistry Q & A-MODEL 2017.PP2.Q N.6

23/11/2020

Comments

 

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


The following steps were used to analyse a metal ore.
(i) An ore of a metal was roasted in a stream of oxygen. A gas with a pungent smell was formed which turned acidified potassium dichromate(VI) green.
(ii) The residue left after roasting was dissolved in hot dilute nitric(V) acid. Crystals were obtained from the solution.
(iii) Some crystals were dried and heated. A brown acidic gas and a colourless gas were evolved and a yellow solid remained. (iv) The solid was yellow when cold.
(v) The yellow solid was heated with powered charcoal. Shiny beads were formed.
Name the:
(a) gas formed when the ore was roasted in air. 
(b) gases evolved when crystals in step (iii) were heated. 
(c) yellow solid formed in step (iii). 
(d) shiny beads in step (iv). 
(e) The yellow solid from procedure (iii) was separated, dried, melted and the melt electrolysed using graphite electrodes.
I. Describe the observations made at each electrode. 
II. Write the equation for the reaction that took place at the anode. 
(f) Some crystals formed in step (ii) were dissolved in water, and a portion of it reacted with potassium iodide solution. A yellow precipitate was formed. Write an ionic equation for this reaction. 
(g) To another portion of the solution from (f), sodium hydroxide solution was added drop by drop until there was no further change. Describe the observation made. 
(h) To a further portion of the solution from (f), a piece of zinc foil was added.
I. Name the type of reaction taking place. 
II. Write an ionic equation for the above reaction.
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2017.PP1.Q N.27

23/11/2020

Comments

 

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


(a) Name two ores in which sodium occurs. 
(b) During extraction of sodium using the down's process, calcium chloride is added to the ore.
Give a reason for the addition of calcium chloride. 
(c) State two uses of sodium.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2016.PP2.QN.5

22/11/2020

Comments

 

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


The diagram below represents a set up of an electrolytic cell that can be used in the production of aluminium.
Picture
​(a) On the diagram, label the anode.
(b)Write the equation for the reaction at the anode.
(c) Give a reason why the electrolytic process is not carried out below 950°C.
(d)Give a reason why the production of aluminium is not carried out using reduction process
(e)Give two reasons why only the aluminium ions are discharged
(f)State two properties of duralumin that makes it suitable for use in aircraft industry.
(g)Name two environmental effects caused by extraction of aluminium.
ANSWERS
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KCSE Chemistry Q & A - MODEL 2019.PP2.QN.2

20/11/2020

Comments

 

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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K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.15

19/11/2020

Comments

 

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


Sodium hydroxide can be prepared by the following methods; I and II
Picture
​(a) Name one precaution that needs to be taken in method I. 
(b) Give the name of process A. 
(c) Give one use of sodium hydroxide.
ANSWERS
(a) Small piece of sodium metal (pea size) with a lot of water
 Perform the experiment wearing goggles.
(b) Electrolysis
(c) Manufacture of paper (soften), soaps and detergents
 Fractional distillation of liquid air
 Extraction of aluminium metal
 Manufacture of bleaching agents eg NaOCl paper, textiles, oil refinery
 Making herbicides on weed killers
 Textile industry to soften

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K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.8

19/11/2020

Comments

 

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


Aluminium is both malleable and ductile.
(a)What is meant by?
(i) Malleable:
(ii)Ductile
(b)State One use of aluminium based on:
(i)malleability
(ii)ductility
ANSWERS
​(a) (i) Can be hammered into sheets.
(ii)Can be drawn into wires.
(b)(i) Making of sufurias/ motor vehicle parts/ aeroplane parts,window / door flames, cups, plates, packaging materials, pans, making sheets/ roof.
(ii)electricity cables/ wires.

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K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.16

17/11/2020

Comments

 

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


The flow chart below shows various reactions of aluminium metal. Study it and answer the questions that follow
Picture
a) i) Other than water, name another reagent that could be R 
 ii) Write the formula of reagent Q 
 b) Write an equation or the reaction in step 5. 
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.2

16/11/2020

Comments

 

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


​(a) Name the raw material from which sodium is extracted. 
(b) Give a reason why sodium is extracted using electrolysis. 
(c) Give two uses of sodium metal.
ANSWERS
(a)Brine (NaCl)
(b) Sodium is very reactive (use electrolysis)
More reactive than carbon.
(c) Uses
Sodium lamps, coolant in nuclear reactors
Sodium cyanide, sodium amalgam
Na202 , Extraction of titanium, 

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K.C.S.E Chemistry Q & A - MODEL 2014.PP2.QN.6

16/11/2020

Comments

 

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


The diagram below represents a set up of an electrolytic cell that can be used in the production of aluminium
Picture
​(a) One the diagram, label the anode 
(b) Write the equation for the reaction at the anode 
(c) Give a reason why the electrolytic process is not carried out below 950°C 
(d) Give a reason why the production of aluminium is not carried out using reduction process
(e) Give two reasons why only the aluminium ions are discharged
(f) State two properties of duralumin that makes it suitable for use in aircraft industry 
(g)Name two environmental effects caused by extraction of aluminium
ANSWERS
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2014.PP1.QN.10

15/11/2020

Comments

 

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


One of the ores of copper has formula, CuFeS2.
(a) Describe how iron in the ore is removed during concentration of copper metal.
(b) State two environmental problems associated with extraction of copper metal.
ANSWERS
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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.3

15/11/2020

Comments

 

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 flow chart in Figure 1 represents some stages in the extraction of copper metal. Study it and answer the questions that follow.
​The flow chart in Figure 1 represents some stages in the extraction of copper metal. Study it and answer the questions that follow
​Identify:
  • (i) the copper ore ………………………. (1 mark)
  • (ii) process B ................................. (1/2 mark)
  • (iii) solid C  ....................................(1/2 mark)
    ​Write an equation for the reaction that forms the slag. (1 mark)
Expected Response
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K.C.S.E Chemistry Q & A - MODEL 2013.PP1.QN.22

11/11/2020

Comments

 

KCSE Chemistry 2013 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 two ores from which copper is extracted 
b) During extraction of copper metal, the ore is subjected to froth flotation.
Give a reason why this process is necessary. 
c) Name one alloy of copper and state its use.
ANSWERS
​(a) Copper pyrites  chalcocite, malachite
(b) To concentrate the ore
(c)  Brass
 Batteries

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    chemistry topical questions and answers for kcse exams

    Chemistry Topics

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    Acetylene Gas
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    Acids Bases And Salts
    Air And Combustion
    Alkaline
    Ammonia
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    Carbon And Its Compounds
    Charles's Law
    Chemical Families
    Chemical Reactions
    Chemistry Practical Assignments
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    Cleansing Agent
    DashBoard
    Definition Of Chemistry Terms
    Differences In Chemistry
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    Down's Cell
    Electric Current On Substance
    Electrochemistry I And II
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    Introduction To Chemistry
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    Salts
    Simple Classification Of Substances
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