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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 empirical formula of a hydrocarbon is (CH2). It has a density of 0.001167g/cm3 at room temperature and pressure. (Molar gas volume at r.t.p is 24dm3)

13/10/2021

Comments

 

The empirical formula of a hydrocarbon is (CH2). It has a density of 0.001167g/cm3 at room temperature and pressure. (Molar gas volume at r.t.p is 24dm3)

​a) Determine the molecular formula of the hydrocarbon (3mks)

Determine the molecular formula of the hydrocarbon


b) Draw the structural formula of the hydrocarbon (1mk)

Draw the structural formula of the hydrocarbon

​c)  Ethene gas burns in Oxygen to form Carbon (IV) oxide and water.

​i) Write an equation for the reaction between ethane gas oxygen gas (1mk)

Picture

ii) 15cm3 of ethene gas were mixed with 50cm3 of oxygen gas and the mixture was ignited into complete combustion. Calculate the volume of excess unreacted gas  (3mks)

Picture

​d) What happens when ethene gas is bubbled through bromine water? (2mks)

  • Bromine water is decolourised
  • Ethene gas is unsaturated hydrocarbon


​e) Give any two uses of ethene gas (2mks)

​Uses of Ethene gas
  • Manufacture of ethanol
  • Manufacture of polythene 
  • Ripening of fruits
  • Laboratory preparation of ethane -1,2-diol used as coolant
  • Manufacture of detergents
(award 1mk for any one correct)

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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

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.6

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


(a) State Graham’s law of diffusion
(b) Explain why a balloon filled with helium gas deflates faster than a balloon of the same size filled with argon gas. 
ANSWERS
(a) Graham’s Law of diffusion
The rate of diffusion of a gas is inversely proportional to the square root of its density at constant temperature and pressure.
(b)Helium is less dense than argon hence it diffuses out of the balloon faster than argon.

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Comments

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


(a) State Charles' Law.
(b) Explain why the pressure of a fixed mass of a gas increases, when the volume of the gas is reduced at constant temperature.​
ANSWERS
(a)The volume of a fixed mass of a gas is directly proportional to the absolute temperature at constant pressure. 
(b)As the volume decreases, there is increased bombardment / collisions of the molecules against the walls of the container, hence increased pressure.

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Comments

K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.20

20/11/2020

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


60 cm3 of oxygen gas diffused through a porous partition in 50 seconds. How long would it take 60cm3 of sulphur (IV) oxide gas to diffuse through the same partition under the same conditions? (S = 32.0, 0 = 16.0)
ANSWERS
Picture

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Comments

KCSE Chemistry Q & A - MODEL 2019.PP1.QN.26

19/11/2020

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


140cm3 of nitrogen gas diffuses through a membrane in 70 seconds. Flow long will it take 200cm3 of carbon(IV) oxide gas to diffuse through the same membrane under the same conditions of temperature and pressure. (3 marks)

Expected Response
Picture
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.4

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) State the Boyles Law 
b) A gas occupies 500cm3 at 27°C and 100,000 Pa, What will be its volume at O°C and 101325 Pa?
ANSWERS
(a) Boyle’s law: The volume of a fixed mass of a gas is inversely proportional to its pressure or the product of pressure and volume is constant at a fixed temperature.
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2014.PP1.QN.6

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


100cm3 of a sample of ethane gas diffuses through a porous pot in 100 seconds. What is the molecular mass of gas Q if 1000 cm3 of the gas diffuses through the same porous not in 121 seconds under the same conditions? (C=12.0, H=1.0)
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2013.PP1.QN.14

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) State the Charles’ law
(b) A certain mass of gas occupies 146 dm3 at 291 K and 98.31 kPa.
What will be its temperature if its volume is reduced to 133 dm3 at 101.325 kPa?
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2012.PP1.QN.19

9/11/2020

Comments

 

KCSE Chemistry 2012 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 shown below was used to investigate a property of hydrogen gas.
Picture
​State and explain the observation that would be made in the glass tube if beaker A was filled with hydrogen gas.
ANSWERS
  • The level of water in glass tube would go down this is because hydrogen gas being less dense than air diffuses through the porous bag, forcing the level of water in the glass tube to go down while the level of water in the beaker rises slightly.

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Comments

KCSE Chemistry Q & A - MODEL 2000.PP1.QN.26

7/11/2020

Comments

 

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


​In an experiment, ammonia chloride was heated in a test tube. A moist red litmus paper placed at the mouth  of the test tube first changed blue  then red. Explain these observations
​Expected Response
NH4Cl decomposes to form NH3(g) and HCl(g).Ammonia diffuses faster than HCl because its light. Ammonia is basic and thus red litmus paper turns blue while HCl is acid thus blue litmus turns red.

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Comments

KCSE Chemistry Q & A - MODEL 2000.PP1.QN.18

5/11/2020

Comments

 

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 given volume of ozone, (O3) diffused from a certain apparatus in 96 seconds. Calculate the time taken by an equal volume of carbon dioxide (CO2) to diffuse under the same conditions (O = 16.0, C = 12.0)

Expected Response
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.25

29/10/2020

Comments

 

KCSE Chemistry 2011 Topical Questions and Answers

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


(a) State the Gay Lussac's Law.
(b) 10cm3 of a gaseous hydrocarbon, C2HX required 30cm3 of oxygen for complete combustion. If steam and 20cm3 of carbon (IV) oxide were produced, what is the value of X?
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.6

28/10/2020

Comments

 

KCSE Chemistry 2011 Topical Questions and Answers

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


A certain mass of gas occupies 0.15dm3 at 293K and 98,648.5Pa. Calculate its Volume at 101,325Pa and 273K.
ANSWERS
Picture

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

    Chemistry Topics

    All
    Acetylene Gas
    Acid Bases And Indicators
    Acids Bases And Salts
    Air And Combustion
    Alkaline
    Ammonia
    Calcium Carbonate
    Carbon And Its Compounds
    Charles's Law
    Chemical Families
    Chemical Reactions
    Chemistry Practical Assignments
    Chlorine And Its Compounds
    Cleansing Agent
    DashBoard
    Definition Of Chemistry Terms
    Differences In Chemistry
    Diffusion
    Down's Cell
    Electric Current On Substance
    Electrochemistry I And II
    Empirical Formula
    Energy Changes In Chemical And Physical Processes
    Ethanol
    Ethene Gas
    Form 1 Level
    Form 2
    Form 3
    Form 4
    Gas Laws
    Haber Process
    Hard Water
    Hydrochloric Acid
    Introduction To Chemistry
    Kcse-1995
    Kcse-1996
    Kcse-1997
    Kcse-1998
    Kcse 1999
    Kcse-2000
    Kcse-2001
    Kcse-2002
    Kcse-2003
    Kcse-2004
    Kcse2005
    Kcse-2005
    Kcse-2006
    Kcse2007
    Kcse-2007
    Kcse-2008
    Kcse-2009
    Kcse-2010
    Kcse-2011
    Kcse-2012
    Kcse-2013
    Kcse-2014
    KCSE 2015
    KCSE 2016
    KCSE 2017
    KCSE 2018
    Kcse 2019
    Metals
    Molecular Formula
    Nitrogen And Its Compounds
    Nuclear Reactions
    Organic Chemistry I
    Organic Chemistry II
    Oxidation
    Oxygen
    Paper 1
    Paper 2
    Paraffin
    Periodic Table
    Phenolphthalein Indicator
    Phosphorous
    Potassium
    Propane
    Properties-and-trends-across-the-period
    Radioactivity
    ​Reaction Rates And Reversible Reactions
    Salts
    Simple Classification Of Substances
    Sodium
    Structure Of The Atom And The Periodic Table
    Structures And Bonding
    Sulphur And Its Compounds
    Sulphuric Acid
    The Mole
    Water And Hydrogen
    Zinc

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    Maurice Atika is a teacher and a netprenuer.



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