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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 three sub – atomic particles found in an atom and state where they are found

9/10/2021

Comments

 

​Name three sub – atomic particles found in an atom and state where they are found (3mks)

Name three sub – atomic particles found in an atom and state where they are found

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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.2

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


Figure 2 is a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of elements.
Picture
(a) (i) Select elements which belong to the same chemical family.
(ii) Write the formulae of ions for elements in the same period.
(b) The hrst ionisation energies of two elements K and M at random are 577 kJ/mol and 494 kJ/mol 
(i) Write equations for the 1ˢᵗ ionisation energies for elements K and M and indicate their energies.
(iii) Write the formula of the compound formed when L and I react.
(iv) Give one use of elemcnt V.
(c) (i) State anothcr group that G can be placcd in Figure 1. Explain. 
(ii) How do the reactivity of elements J and K compare? Explain. 
(d) (i) Elements L and M form chlorides.
​Complete the following table by writing the formulae of each chloride and state the nature of the solutions.
Picture
​(ii) The chloride of element M vapourises easily while its oxide has a high melting point. Explain.
ANSWERS
Picture
Picture

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.17

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


 Figure 5 represents a grid that is part of the periodic table. Study it and answer the questions that follow. The letters are not the actual symbols of the elements.
Picture
(a) Write the electron arrangement of element C. 
(b) On the grid provided, show with a tick (✓) the position of element D whose atomic number is 18. 
(c) Element E is more reactive than A. Explain. 
ANSWERS
​(a) 2.8.4
(b) period 3, group 8
(c) E has a bigger atomic radius than A / the valence electrons of element E are further from the nucleus, hence loosely held by the positive nucleus and requires less energy to be removed during reaction.
OR
A has a smaller atomic radius than E / the valence electrons of element
A are closer to the nucleus, hence strongly held by the positive nucleus and requires more energy to be removed during a reaction.

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.11

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) Element U has atomic number 12 while element V has atomic number 16. How do the melting points of their oxides compare? Explain. 
ANSWERS
  • The oxide of U has higher melting point than the oxide of V;
  • -This is because the oxide of U is a solid with ionic bonds hence requires a lot of energy to melt;
  • -The oxide of V is a gas hence requires little energy to melt/break molecular forces of attraction.

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K.C.S.E Chemistry Q & A-MODEL 2017.PP1.Q N.11

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


An oxide of element K has the formula K2O5.
(a) Determine the oxidation number of K.
(b) To which group of the periodic table does K belong?
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2017.PP1.QN.1

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


Table 1 shows the atomic numbers and the first ionisation energies of three elements. The letters are not actual symbols of the elements. Use it to answer the questions that follow.
Picture
​(a) Explain the trend in first ionisation energy from A to C. 
(b) Write the electronic configuration for the ion of C. 
ANSWERS
(a) Ionisation energy decreases down the group 1 elements.
 This is because atomic radii increases from A to C (down the group) /outermost electron is far from nucleus hence requires less energy to be lost during reaction.
(b)Electron configuration of ion of C- 2.8.8

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K.C.S.E Chemistry Q & A - MODEL 2016.PP2.QN.7

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


(a) Write an equation to show the effect of heat on the nitrate of: 
(i) Potassium
(ii) Silver
(b) The table below gives information about elements Ai, A2, A3, and A4
i) In which period of the periodic table is element A2? Give a reason.
Picture
(ii) Explain why the atomic radius of:
I. Ai is greater than that of A2;
II. A4 is smaller than its ionic radius.
(iii) Select the element which is in the same group as A3.
(iv) Using dots (•) and crosses(x) to represent outermost electrons, draw a diagramto show the bonding in the compound formed when Ai reacts with A4. 
ANSWERS
Picture
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2016.PP1.QN.16

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


​The atomic number of sulphur is 16. Write the electron arrangement of sulphur in the following: 
Picture
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2015.PP2.QN.7

18/11/2020

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


Picture
​(b) When magnesium burns in air, it forms a white solid and a grey-green solid.
When a few drops of water are added to the mixture, a gas that turns red litmus paper blue is evolved.
Identify the
(i) white solid. 
(ii) gas evolved and state its use.
(I) Name of gas 
(II) Use of the gas. ; 
(c) Two different samples of water (I and II) were tested with soap solution.
Sample II was further subjected to two other processes before adding soap. 20 cm3 of each sample of water was shaken with soap solution in a boiling tube until a permanent lather was obtained. The results are shown in the table below
Picture
​(i) Identify the water sample that had temporary hardness. Explain your answer.
(ii) Explain why the results for sample II are different after distilling but remain
unchanged after filtering. 
(iii) State two disadvantages of using both water samples for domestic purposes.
ANSWERS
Picture
(i) - Water sample with temporary hardness is I
- It uses less soap after boiling
Picture

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.21

18/11/2020

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


​Study the information in Table 3 and use it to answer the questions that follow.
Study the information in Table 3 and use it to answer the questions that follow
  • ​(a) Explain the trend in atomic radii from sodium to chlorine. (I mark)
  • (b) Explain how the chloride of aluminium differs from those of other metals in the period. (2 marks)
​Expected Response
Picture

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K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.20

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 crystal of iodine, heated gently in a test tube gave off a purple vapour.
(a) Write the formula of the substance responsible for the purple vapour. 
(b) What type of bond is broken when the iodine crystal is heated gently? 
(c) State one use of iodine.
ANSWERS
(a)Formula of Iodine I2
(b)Weak Van der Waals
(c)Antiseptic

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K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.14

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 table below shows behaviour of metals R, X, Y and Z. Study it and answer the questions that follow:
Picture
​a) Arrange the metals in the order of reactivity starting with the most reactive 
b) Name a metal which is likely to be 
i X
ii Y
ANSWERS
(a) Reactivity series starting with the most reactive
  X R Z Y
(b) X could be potassium 
    Y could be copper 

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K.C.S.E Chemistry Q & A - MODEL 2014.PP1.QN.29

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


​a)What is meant by the term radical? 
b) The table below contains atoms that form common radicals. Complete the table to show radicals formed from various atoms.
Picture
ANSWERS
​(a) A radical is a compound formed when elements combine to form ions / free unstableatoms or molecules / a group of free unstable atoms exist in a compound /group of atoms with a common charge. 
Picture

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K.C.S.E Chemistry Q & A - MODEL 2014.PP1.QN.18

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


Use the part of the periodic table given below to answer the questions that follow (Letters are not the actual symbols of the elements)
Picture
​a) Identify the element that forms giant covalent structures 
b) Identify one element that does not form compounds 
c) Write the formula for the nitride of M
ANSWERS
Picture

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    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
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    Metals
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    Nuclear Reactions
    Organic Chemistry I
    Organic Chemistry II
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    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
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    Maurice Atika is a teacher and a netprenuer.



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