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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

The table below gives the volume of hydrogen gas produced when different acids of 50cm3 were each reacted with 10cm piece of magnesium ribbon in a conical flask.

14/10/2021

Comments

 
The table below gives the volume of hydrogen gas produced when different acids of 50cm3 were each reacted with 10cm piece of magnesium ribbon in a conical flask.
The table below gives the volume of hydrogen gas produced when different acids of 50cm3 were each reacted with 10cm piece of magnesium ribbon in a conical flask.

a) On the grid provided, plot on the same axis, the graph of volume of gas produced against time (4mks)



In the graph plotted ; Award marks as follows:
  1. Plotting; award 2 marks for 
  2. Smooth curve
  3. Scale (x and y)

​b) From the graph, determine the rate of reaction of both acids at 55 seconds

​i) 1M sulphuric (VI) acid (1mk)

​Rate of 1M H2SO4 = 0.5 ± 0.05

​ii) 1M ethanoic acid (1mk)

​Rate of 1M ethanoic acid = 0.25 ± 0.01

c) The rate of reaction of H2SO4 is twice that of ethanoic acids. This is because H2SO4 is stronger while ethanoic acid is a weak acid.

Picture

​c) Explain the difference in the rate of evolution of the gas as determined in (b) above       (2mks)



d) Calculate the number of moles of hydrogen gas produced when 10cm magnesium ribbon is completely reacted with 1M sulphuric (VI) acid. (Molar gas volume = 24dm3 at r.t.p) (2mks)

​e) What mass of magnesium had therefore reacted? (Mg = 24) (2mks)

Picture

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Comments

Use the flow chart below to answer the questions that follow

13/10/2021

Comments

 
Use the flow chart below to answer the questions that follow
Use the flow chart above to answer the questions that follow


​​a) Name the following;

​i) Gas L (1mk)

​Gas L – Carbon (IV) Oxide

​ii) Gas H (1mk)

​Gas H – Hydrogen 

​iii) K (1mk)

​K – Propane 

​​b) Name the processes involved in the following steps

​i) Step I (1mk)

Step I : Hydrogen 

​ii) Step II (1mk)

​Step II – Neutralization

​​iii) Step III (1mk)

​Step III – Substitution 

​c) Draw the structure of compound E (1mk)

Draw the structure of compound E

​d) Write a chemical equation for the complete combustion of substance F (1mk)

rite a chemical equation for the complete combustion of substance F

​e) Name the condition and reagents in step III 

​i) Condition (1mk)

​U.V light  

​ii) Reagent (1mk)

​Chlorine

​f) Calculate the mass of salt Q that would be formed by using 21.9kg of G when it reacts with excess sodium hydroxide (2mks)
(C = 120, H = 1.0, Na = 23.0, O = 16.0)

Calculate the mass of salt Q that would be formed by using 21.9kg of G when it reacts with excess sodium hydroxide


​g) i) Draw the structure of polymer D (1mk)

Draw the structure of polymer D

​ii) State one use of the above polymer (1mk)

  1. Mouldings 
  2. Plastic ropes / Synthetic fibres 
  3. Use in films

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Comments

State two disadvantages of hard water

11/10/2021

Comments

 
  1. Waste soap
  2. Form coating in kettles;  Pipes and boilers 
  3. Bursting of hot pipes

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Comments

Study the experiment below and answer the questions that follow. The gas produced ignites spontaneously

10/10/2021

Comments

 
Study the experiment below and answer the questions that follow. The gas produced ignites spontaneously
Study the experiment above and answer the questions that follow. The gas produced ignites spontaneously

i) Which metal is used above (1mk)

​Potassium

ii) Which gas was produced (1mk)

​Hydrogen

​iii) What will be the colour of phenolphthalein indicator in the resulting solution? (1mk)

​Pink

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Comments

Name one gas used together with oxygen in welding other than acetylene gas

10/10/2021

Comments

 

​Name one gas used together with oxygen in welding other than acetylene gas (1mk)

​Hydrogen

State two other uses of the gas named above (2mks)

  1. Used in balloons
  2. Used in the manufacture of ammonia gas
  3. Used in the manufacturer of hydrochloric acid 

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Comments

Explain why potassium is kept under paraffin while phosphorous is kept under water

8/10/2021

Comments

 

​Explain why potassium is kept under paraffin while phosphorous is kept under water

​Potassium does not react with paraffin but react with water while phosphorous react with paraffin but does not react with water

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.21

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


​Study the set-up in Figure 6 and answer the questions that follow.
Picture
(a) Name the substance that was collected in tube p. 
(b) Write an equation for the reaction which occurs in tube Q in the first few minutes of the experiment. 
(c) Give a suitable Conclusion for the experiment in the set-up. 
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.10

24/11/2020

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


Using iron filings, describe an experiment that can be conducted to show that oxygen is present in air. 
ANSWERS
  • Wet a measuring cylinder/gas jar and sprinkle some iron filings on the wet surface. Remove the excess iron filings;
  •  Invert the measuring cylinder in a trough of water;
  •  Take the reading of the air column in the measuring cylinder. Leave the set-up for 2 days;
  •  Read and record the volume of the air column;
  •  The volume of the air reduced and the grey filings changed to a brown substance;
  •  The brown substance is a compound of iron and oxygen;
  •  The oxygen in the air reacted with the iron fillings to form rust.

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Comments

K.C.S.E Chemistry Q & A-MODEL 2017.PP2.Q N.3

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) A student used Figure 2 to investigate the action of dilute sulphuric(VI) acid on some metals. Beaker I and II contained equal volumes of dilute sulphuric(VI) acid. To beaker I, a clean iron rod was dipped and to beaker II, a clean copper rod was dipped.
Picture
(i) Why was it necessary to clean the metal rods? 
(ii) Describe the observations made in each beaker.
Beaker I:
Beaker II: 
(iii) Explain the observations in (a) (ii). 
(b) Figure 3 shows the apparatus used to burn hydrogen in air. Use it to answer the questions that follow.
Picture
(i)State the role of substance X.
(ii) Give the name of the substance that could be used as X.
(iii) State the role of the suction pump. 
(iv) Name the product Y formed.
(v) Give a simple physical test to prove the identity of Y.
vi) State the difference between 'dry' and 'anhydrous'.
ANSWERS
​ (a) (i) To remove oxide layer on the metal.
(ii) Beaker I :
. Bubbles of a colourless gas / effervescence ;
. Solution turns green; 
. the size of iron rod decreases 
Beaker II:
. The solution remained colourless.
. No bubbles/effervescence
Picture
​OR
Iron is more reactive than hydrogen hence it reacts with sulphuric(VI) acid to
produce hydrogen gas and iron(III) sulphate which is green.
Beaker II:
Copper is below hydrogen hence no reaction will take place.  
(b) (i) To dry hydrogen gas. 
(ii) Calcium oxide /anhydrous calcium chloride /silica gel.
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2017.PP1.Q N.12

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


Potassium nitrate liberates oxygen gas when heated. Draw a diagram of a set-up that shows heating of potassium nitrate and collection of oxygen gas.
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.4

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


The set up below was used to investigate the reaction between dry hydrogen gas and copper
Picture
(a) Name substance A.
(b) State the observation made in the combustion tube.
(c) Explain the observation stated in (b) above.
ANSWERS
(a) Fused anhydrous calcium chloride
 Cao: fused CaCl2
(b) Black CuO changes to brown Cu metal
 Formation of colourless liquid on the cooler parts of the combustion tube.
(c) Copper (II) oxide is reduced by hydrogen to copper metal while hydrogen is oxidized to water /CuO reduced to Cu /H2 Oxidized to H2O

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Comments

K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.9

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 set up below was used to investigate the reaction between dry hydrogen gas and copper (II) oxide
Picture
a) Name substance A  
b) state the observation made in the combustion tube 
c) Explain the observation stated in (b) above.
ANSWERS
​(a) Substance A - Calcium Oxide- fused calcium chloride
- Accept any other answer
(b) Black Copper (II) Oxide (Solid) changes to brown
Colourless liquid formed on the cooler part of the combustion tube.
(c) Copper (II) Oxide is reduced to Copper metal.

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Comments

KCSE Chemistry Q & A - MODEL 2019.PP1.QN.14

17/11/2020

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


During laboratory preparation of oxygen, manganese(IV) oxide is added to reagent H.
  • (a) Name reagent H. (1 mark)
  • (b) State the role of manganese (Iv) oxide in this experiment. (1 mark)
  • (c) Write the equation for the reaction that takes place. (1 mark)
Expected Response
Picture

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Comments

KCSE Chemistry Q & A - MODEL 2019.PP1.QN.5

16/11/2020

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


Hydrogen gas can be prepared by passing steam over heated magnesium ribbon as shown in Figure 2.
 Hydrogen gas can be prepared by passing steam over heated magnesium ribbon as shown in Figure 2.
​(a) Write an equation for the reaction that produces hydrogen gas. (1 mark)
(b) Explain why the delivery tube must be removed from beneath the water before heating is stopped. (1 mark)
(c) Explain why sodium metal is not suitable for this experiment. (1 mark)
Expected Response
Picture

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Comments
<<Previous
    chemistry topical questions and answers for kcse exams

    Chemistry Topics

    All
    Acetylene Gas
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    Air And Combustion
    Alkaline
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    Introduction To Chemistry
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