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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

K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.6

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) In Kenya, sodium carbonate is extracted from trona at Lake Magacli.
(i) Give the formula of trona. 
(ii) Name the process of extracting sodium carbonate from trona. 
(b) The flow chart in Figure 5 summarises the steps involved in the production of sodium carbonate.
Use it to answer the questions that follow.
Picture
​(i) Name the process illustrated in Figure 5. 
(ii) Identify the starting raw materials required in the production of sodium carbonate. 
(iii) Write equations for the two reactions that occur in the carbonator. 
(iv) Name two substances that are recycled. 
(v) Identify:
Solid X; 
Process W. 
(vi) Write an equation for the reaction that produces solution Z. 
(vii) Apart from softening hard water, state two other uses of sodium carbonate.
 
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.5

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) The diagram in Figure 4 was used to prepare hydrogen chloride gas which was passed over heated iron powder.
Picture
(i) Give a pair of reagents that will produce hydrogen chloride gas in flask A. 
(ii) Name the substance in flask B. 
(iii) State the observation made in the combustion tube. 
(iv) Write an equation for the reaction in the combustion tube. 
(v) Describe a chemical test for hydrogen chloride gas. 
(b) (1) Identify the gas that burns at the jet. 
(ii) Explain why the gas in (b) (I) is burned.
(c) Give reasons why excess hydrogen chloride gas is dissolved using the funnel arrangement. 
(d) State what will be observed when the reaction in the combustion tube is complete.
(e) Another experiment was carried out where hydrogen chloride gas was bubbled through methylbenzene and water in separate beakers. The resulting solutions were tested with blue litmus papers and marble chips.
(i) Write the observations made in the following table.
Picture
​(ii) Explain the observations in (e) (i). 
ANSWERS
Picture
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.4

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


​An experiment was carried out to prepare crystals of magnesium sulphate. Excess magnesium powder was added to 100 cm3 of dilute sulphuric (VI) acid in a beaker and warmed until no further reaction took place. The mixture was filtered and the filtrate evaporated to saturation, then left to cool for crystals to form.
(a) (i) Write an equation for the reaction. 
(ii) Explain why excess magnesium powder was used. 
(iii) State how completion of the reaction was determined. 
(iv) What is meant by a saturated solution? 
(v) Explain why the filtrate was not evaporated to dryness. 
(b) When bleaching powder, CaOCl2, is treated with dilute nitric(V) acid, chlorine gas is released. This reaction can be used to determine the chlorine content of various samples of bleaching powders and liquids.
(i) Write an equation for the reaction of nitric(V) acid with bleaching powder.
(ii) Calculate the volume of chlorine produced when 10g of CaOCl2 is treated with excess nitric (v) acid. (Ca = 40.0; 0 = 16.0; Cl = 35.5; 1 mole of gas occupies 22.4dm3 at s.t.p) 
(c) Apart from use of chlorine gas in bleaches and water treatment, state two other uses of chlorine gas.
ANSWERS
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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.3

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) Complete Table I by indicating the observations, type of permanent or temporary change and name of new compound formed.
Picture
(b) Use the set-up in Figure 3 to answer the questions that follow. The flask was covered with a cloth that had been soaked in ice-cold water.
Picture
(i)State the observation made on the coloured water. Explain.
(ii) Name the gas law illustrated in Figure 3. 
(c)Use the standard electrode potentials in Table 2 to answer the questions that follow.
Picture
​(i)Write the half-cell representation for the element whose electrode potential is for hydrogen. 
(ii) Arrange the elements in order of reducing power, starting with the weakest reducing agent. 
(iii) I Select two half cells which combine to give a cell with the least e.m.f. 
II Calculate the e.m.f of the half cells identified in (iii) I. 
ANSWERS
Picture

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Comments

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
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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.1

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


The diagram in figure I shows some natural and industrial processes. Study it and answer the questions that follows
Picture
​(a) Identify the processes labelled: 
A...................
B...................
C...................
D...................
(b) State the reagents and conditions required for processes B and D.
(i) Process B:
Reagent................
Conditions ............ 
(ii) Process D:
Reagent................
Conditions ............ 
(iii) Describe how process D is carried out.
(iv) State two additives used to improve the quality of soap.
(c) State the reagents required in steps F and G.
(iii) Draw the structure of terylene.
(d) (i) Name the polymer formed in step C.
(ii) State one disadvantage of the polymer formed in (d) (i).
ANSWERS
Picture
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.28

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


Distinguish between empirical and molecular formula of a compound.
ANSWERS
  • Empirical formula shows the simplest whole number ratio of the moles of atoms of different elements in a compound while the molecular formula shows the actual number of atoms of various elements present in one molecule of the compound.

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.27

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


(NH4)2HPO4 is a fertilizer used by farmers to boost their crop production.
(a) Calculate the mass of phosphorus in a 20 kg packet 14.0; H = 1.0; P = 31.0; 0 16.0)
(b) State one advantage of this fertilizer, (NH4)2HPO4 over urea CO(NH2)2
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.26

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


Explain why commercial indicators are preferred to flower exacts as acid-base indicators.
ANSWERS
  • The composition of commercial indicators remains constant. hence gives consistent results.
  • The composition of flower extracts change with time giving inconsistent results.

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.25

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


 Explain why a solution of sodium chloride Conducts electricity while that of sugar does not.
ANSWERS
  • A solution of sodium chloride contains ions which are free to conduct electricity while that of sugar contains molecules hence cannot conduct electricity.

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Comments

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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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.23

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


 Explain why it is important to put off a non-luminous flame immediately after use.
ANSWERS
  • A non -luminous flame is invisible, hence it should be put off to avoid being accidentally burned.

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.22

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


 You are provided with the following: thermometer, boiling tube, beaker, Bunsen burner, pure substance X whose boiling point is about 80°C, water and any other apparatus that may be required. Draw a labelled diagram of the set-up that can be used to determine the melting point of X. 
ANSWERS
Picture

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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
<<Previous

    Chemistry Topics

    All
    Acid Bases And Indicators
    Acids Bases And Salts
    Air And Combustion
    Alkaline
    Carbon And Its Compounds
    Chemical Families
    Chlorine And Its Compounds
    DashBoard
    Electric Current On Substance
    Electrochemistry I And Ii
    Energy Changes In Chemical And Physical Processes
    Form 1 Level
    Form 2
    Form 3
    Form 4
    Gas Laws
    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
    Nitrogen And Its Compounds
    Organic Chemistry I
    Organic Chemistry Ii
    Paper 1
    Paper 2
    Periodictable
    Properties-and-trends-across-the-period
    Radioactivity
    ​Reaction Rates And Reversible Reactions
    Salts
    Simple Classification Of Substances
    Structure Of The Atom And The Periodic Table
    Structures And Bonding
    Sulphur And Its Compounds
    The Mole
    Water And Hydrogen

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    May 2020
    August 2019

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