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  • kcse form 2 mathematics questions

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

20/11/2020

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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
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KCSE Chemistry Q & A - MODEL 1999.PP2.QN.3

31/10/2020

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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


Study the information in the table below and answer the questions that follow. The letters do not represent the symbols of the elements.
The letters do not represent the symbols of the elements
​a) Write the electrons arrangement for the atom formed by elements and M and Q
b) Select an element which is
  • i) The most reactive non – metal
  • ii) A poor conductor of electricity
c) In which period of the periodic table does elements R below.
d) Element R lodes its outermost electron more readily than I. Explain
e) Using dots(.) and crosses (x) to represent outermost electrons show
bonding in the compound formed elements N and Q.
f) Explain why the melting point elements M is higher than that of element .
g) Describe how a solid mixture of sulphate of R and lead sulphate can be separated into solid samples.
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP2.QN.4

31/10/2020

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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


​a) The flow chart below shows a sequence of reactions starting with.
           Study and answer the questions that follow.
The flow chart below shows a sequence of reactions starting with
  • i) Name the reagent and state the condition for the reaction in step.
    • Reagent
    • Condition
  • ii) Give the names of the following
    • i) Solid S
    • ii) Solid V
    • iii) Solid T
  • iii) Give reasons for the colour change in step 2
  • ii) Write an ionic equation for the reaction which takes place in step 3.
  • v) Name one other substance that could be used instead of sodium hydroxide in step III.
b) In an experiment 3.36g of iron fillings were added to excess aqueous copper(II) sulphate. Calculate the mass of copper that was deposited.
          Cu = 63.5, Fe = 56.0
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KCSE Chemistry Q & A - MODEL 1999.PP2.QN.6

31/10/2020

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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


a) The diagram below shows a set –up used by as a student in an attempt to prepare and collect oxygen gas
The diagram below shows a set –up used by as a student in an attempt to prepare and collect oxygen gas
  • i) Complete the diagram correcting the mistakes on it
  • ii) Identify solid W.
a) A piece of phosphorus was burnt in excess and the product obtained was shaken with a small amount of hot water to make a solution.
  • i) Write an equation for the burning of phosphorus in excess air.
b) Explain why cooking pots made of aluminium do not corrode when exposed to air.
c) The reaction between sulphur dioxide and oxygen to form trioxide in the contact process in exothermic.
The reaction between sulphur dioxide and oxygen to form trioxide in the contact process in exothermic

Factory manufacturing sulphuric acid by contact process produces 350kg of sulphur trioxide per day (conditions) for the reaction catalyst. 2 atmospheres pressure and temperatures between. (400 – 5000C)

i) What is meant by an exothermic reaction?

ii) How would the yield per day of sulphur trioxide be affected Temperatures lower than 40000C are used? Explain.

Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP2.QN.5

31/10/2020

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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


​a) When an organic compound Y is reacted with aqueous sodium carbonate, it produces carbon dioxide reacts with propanol to form a sweet smelling compound Z whose formula is.
Picture
  • i) Name and draw the structural formula of compound Y.
  • ii) What is the name of the group of compounds to which Z belongs?
b) In an experiment excess ethanol was warmed with potassium dichromate for about twenty minutes. State and explain the observation that was made at the end of the experiment.
c) The scheme below was used to prepare a cleaning agent.
Study and answer the questions that follow.
Study and answer the questions that follow
​i) What name is given to the type of cleaning agent prepared by the method shown in the scheme?
ii) Name one chemical substance added in step II
iii) What is the purpose of adding the elements substance names in C(ii) above.
iv) Explain how an aqueous solution of the cleansing removes oil from utensils during washing.
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP2.QN.2

30/10/2020

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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 set – up below was used during the electrolysis of aqueous magnesium sulphate using inert electrodes
Picture

i) Name a suitable pair of electrodes for this experiment

ii) Identify the ions and cations in the solution

iii) On the diagram label the cathode

iv) Write ionic equations for the reactions that took place at the anode.

v) Explain the change that occurred to the concentration of magnesium sulphate solution during the experience.

vi) During the electolysis a current of 2 amperes was passed through the solution for 4 hours.

Calculate the volume of the gas produced at the anode.(1 faraday 96500 coulombs and volume of a gas at room temperature is 24000cm3)

vii) One of the uses of electrolysis is electroplating What is meant by electroplating? Give tow reasons why electroplating is necessary.

Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP2.QN.1

30/10/2020

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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 table below gives the volume of the gas provided when different volumes of 2M hydrochloric  were reacted with 0.6g of magnesium powder at room temperature
The table below gives the volume of the gas provided when different volumes of 2M hydrochloric were reacted with 0.6g of magnesium powder at room temperature
(a) Write an equation fro the reaction between magnesium and hydrochloric acid
(b) On the grid provided plot a graph of the volume of gas produced
(vertical axis), against the volume of acid added (Note the reaction comes to completion, the volume of the gas produced directly proportional to completion, the acid added).
From the graph determine

c) 

  • ​i) The volume for the gas produced if 12.5cm3 of 2M hydrochloric acid had been used. 
  • ii) The volume of 2M hydrochloric acid which when reacted completely with 0.6 of magnesium powder. 

e) Given that one mole of the gas occupied 24000cm3 at room temperature.

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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.27

30/10/2020

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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 table below shows the PH values of solutions I, II, III and IV.

Picture
​(a) Which solution is likely to be that of calcium hydroxide?
(b) Select the solution in which a sample of aluminium oxide is likely to dissolve. Give reason for your answer
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.28

30/10/2020

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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


Bromine reacts with ethane as shown below
Picture
​(a) What condition is necessary for this reaction to occur?
(b) Identify the bonds which are broken and those that are formed 
  • Bonds broken
  • Bonds formed
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.26

30/10/2020

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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
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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.25

29/10/2020

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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


When solid magnesium carbonate was added to a solution of hydrogen chloride in methylbenzene, there was no apparent reaction. On addition of water to the resulting mixture, there was vigorous effervescence. Explain these observations
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.24

29/10/2020

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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


One of the fuels associated with crude oil is natural gas. Name the main constituent of natural gas  and write an equation  for its complete combustion 
Name:
Equation:
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.23

29/10/2020

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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


When excess carbon monoxide gas was  passed over heated  lead (II) oxide in combustion tube,  lead (II)  oxide was reduced
(a) Write an equation for the reaction, which took  place
(b) What observation was made in the  combustion tube when the reaction was complete?
(c) Name another gas,  which could  be used to reduce lead (II) oxide
Expected Response
​(a) Pb(s)  + CO(g) →Pb(s) + CO2(g)
(b) Silvery white or grey metal/ shiny grey metal
(c) Hydrogen gas / ammonia

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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.22

29/10/2020

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


Compound  L reacts with hydrogen  bromide gas to give another  compound whose structure is
Picture
​(a) Give the structural formula and name  of compound L
(b) Write an equation for the reaction, which takes place between ethane and excess chlorine gas
Expected Response
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KCSE Chemistry Q & A - MODEL 1999.PP1.QN.21

29/10/2020

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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


State  and explain  one disadvantages of using  hard water  in boilers
Expected Response
 On boiling hard water deposits CaCO3 which forma fur/ scales in the boiler. This reduces conductivity

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    chemistry topical questions and answers for kcse exams

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