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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

State three differences between chemical and nuclear reactions.

11/10/2021

Comments

 

​a) State three differences between chemical and nuclear reactions. (3mks)

Chemical reaction

Nuclear reaction

  • It takes place on the outer

  • Take place within the nucleus

  • Heat energy released is less

  • Heat energy released is large

  • Involves electrons

  • Involves neutrons and electrons

  • Affected by environmental factors

  • No affected by the environmental factors

  • such as temperature and pressure


(any three 3mks)

b) Study the figure below and answer the questions that follow 

Study the figure below and answer the questions that follow

Identify the radiations A, B and C (3mks)

  • A-Gamma rays
  • B-Beta rays
  • C-Alpha rays

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.19

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) Give the symbols of the o charged particles emitted by a radioactive isotope.
Picture
​mass number 
atomic number:
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2017.PP2.Q N.7

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 decay rates of a sample of a radioisotope of bismuth at different time intervals is indicated in the following table.
Picture
(a)(i) Draw a graph of disintegration rate against time. 
(ii) Determine the half-life of bismuth. 
(iii) What would be the effect on the curve if half the amount of sample of bismuth were used. 
(b) Radioactivity has several applications. State one application of radioactivity in: 
(i) Medicine 
(ii) Agriculture 
(iii) Tracers 
(iv) Nuclear power station 
(c) State two dangers associated with radioactivity. 
ANSWERS
Picture
Picture
(ii) It would have no effect on the curve as the quantity of bismuth does not affect half-life. 
(b)(i)Applications in medicine
 Sterilizing surgical instruments.
 Destroying cancerous tissues during radiotherapy.
 Provide power to the heart pace setters.
(ii) Applications in agriculture
 Monitor photosynthesis and other related processes.
 Preservation of foodstuffs, by exposing 
Micro-organisms to gamma rays.
 Rate of absorption of a fertilizer by the plant.
(iii)Applications in Tracers
 Detecting leakages in underground water or oil pipes. 
(iv)Applications in Nuclear power stations.
To generate electricity. 
(d) Dangers of radioactivity
 Long term exposure causes genetic mutation;
 Radioisotopes can be used as weapon of mass 
Destruction;
 Causes skin cancer;
 When tested causes environmental pollution.​

Read More
Comments

K.C.S.E Chemistry Q & A - MODEL 2017.PP1.QN.2

22/11/2020

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


​Calculate the values of X and Y in the following nuclear equation.
Picture
ANSWERS
  • X=231
  • Y= 90

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Comments

K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.11

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


a)Complete the nuclear equation below:
Picture
(c)Give one harmful effect of radioisotopes.
ANSWERS
Picture
Picture
​Instant / cause death
 Cause cancer
 Cause gene mutation

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Comments

KCSE Chemistry Q & A - MODEL 2019.PP1.QN.22

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


​The diagram in Figure 6 Shows radiations emitted by a radioactive sample.
Picture
  • (a) Identify radiations:
    • (i)   M …………….(1 mark)
    • (ii)  N ……………...(1 mark)
  • (b) Explain what would happen when a sheet of paper is placed in the path of the two radiations. (1 mark)
Expected Response
Picture

Read More
Comments

K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.19

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


A radioactive substance weighing M kg took 1900 years for the original mass to reduce to 15 kg. Given that the half life of the radioactive substance is 380 years; 
(a) Determine the original mass of the radioactive substance.
(b) State two uses of radioactivity in medicine. .
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2014.PP1.QN.8

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


Picture
ANSWERS
Picture
​(b) (i) Cobalt 60 is used to detect the activity of the thyroid gland. 
(ii) To sterise equipment/treatment of cancer/radio active Na for disorders in blood circulation/Barium meal for ulcers/detect fractures in bones.

Read More
Comments

K.C.S.E Chemistry Q & A - MODEL 2013.PP2.QN.6

13/11/2020

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) distinguish between a neutron and proton 
(b) What is meant by a radioactive substance? 
(c) State two dangers associated with radioactive substance in the environment
Picture
​(i) What is the atomic
a. Mass of Y 
b. Number of Y 
(ii) What name is given to the type of reaction undergone by the isotopes of hydrogen?
(e)(i) What is meant by half-life of a radioactive substance 
(ii) 288 g of a radioactive substance decayed to 9 g in 40 days. Determine the half-life of the radioactive substance
ANSWERS
​(a)A proton has a +ve charge while a neutron has no charge 
(b)Substances undergo radioactive decay or disintergration.
(c)-  causes genetic mutation   
-  can cause death
-  prone to cancer
(d)(i)I Atomic mass of a = 4
IIAtomic number of b = 2
(ii)Fusion
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2013.PP1.QN.8

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


Draw a labeled diagram to illustrate how alpha, beta and gamma radiations can be distinguished from each other.
ANSWERS
Picture

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Comments

KCSE Chemistry Q & A - MODEL 2001.PP1.QN.1

9/11/2020

Comments

 

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


​Study the nuclear reaction given below and answer the questions that follow
Picture
Expected Response
Picture

Read More
Comments

KCSE Chemistry Q & A - MODEL 2000.PP1.QN.13

4/11/2020

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 radioactive isotope X2 decays by emitting two alpha (a) particles and one beta (β) to from

214 Bi

83

(a) What is the atomic number of X2?

(b) After 112 days, 1/16 of the mass of X2 remained. Determine the half life of X2

​Expected Response

Read More
Comments

K.C.S.E Chemistry Q & A - MODEL 2012.PP1.QN.9

1/11/2020

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


​120g of iodine - 131 has a half life of 8 days and decays for 32 days. On the grid provided, plot a graph of the mass of iodine - 131 against time.
ANSWERS
Picture

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Comments

KCSE Chemistry Q & A - MODEL 1999.PP1.QN.26

30/10/2020

Comments

 

KCSE Chemistry 1999 Topical Questions and Answers

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


The graph below shows the mass of a radioactive isotope plotted against time
Picture
​(a) Using the graph, determine the half – life of the isotope
(b) Calculate the mass of the isotope present after 32 days
Expected Response
Picture

Read More
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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