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K.C.S.E Chemistry Q & A - MODEL 1998.PP2.QN.7

27/10/2020

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KCSE Chemistry 1998 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 table below gives the solubilities of hydrated copper (II) sulphate in mol dm3 at different temperatures

(i) On the grid provided, plot a graph of solubility of copper (II) sulphate (vertical axis) against temperature.

(ii) From the graph, determine the mass of copper (II) sulphate deposited when solution is cooled from 700C to 400C.

        (Molar mass of hydrated copper (II) sulphate = 250g)

(b) In an experiment to determine the solubility of sodium chloride, 5.0cm3 of a saturate solution of sodium chloride weighing 5.35g were placed volumetric and diluted to a total volume of 250cm3.

25.0cm3 of the dilute solution chloride completely reacted with 24cm3 of 0.1M silver nitrate solution.

AgNO3(aq) + NaCI(aq)  →    AgCl(s) + NaNO3(aq)

Calculate:

(i) Moles of silver nitrate in 24cm3 of solution

(ii) Moles of sodium chloride in 25.0cm3 of sodium

(iii) Moles of sodium chloride in 250cm3 of solution

(iv) Mass of sodium chloride in 5.0cm3 of saturated sodium chloride Solution (Na = 23.0, CI = 35.5)

(v) Mass of water in 5.0cm3 of saturated solution of sodium chloride

(vi) The solubility of sodium chloride in g/100 water

ANSWERS
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KCSE Chemistry Q & A - MODEL 1998.PP2.QN.6

25/10/2020

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KCSE Chemistry 1998 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 given in the table below and answer the questions that follow. The letters do not represents the actual symbols of the elements
Study the information given in the table below and answer the questions that follow. The letters do not represents the actual symbols of the elements
(a) Select the elements which belong to the same 
  • (i) Group
  • (ii) Period
(b) Which element
  • (i) Is in gaseous state at room temperature? Explain
    (Take room temperature to be 298K)
  • (ii) Does not form an oxide?
(c) Write the
  • (i) Formula of the nitrate of element
  • (ii) Equation for the reaction between elements S and U
(d) What type of bond would exists in the compound formed when U and T react? Give a reason for your answer
(e) The aqueous sulphate of element W was electrolyzed using inert electrodes Name the products formed at the:
  • (i) Cathode
  • (ii) Anode
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KCSE Chemistry Q & A - MODEL 1998.PP2.QN.3

24/10/2020

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KCSE Chemistry 1998 Topical Questions and Answers

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


​The flow chart below shows the industrial preparation of ammonia and the process used in the manufacture of some ammonium compounds. Study and answer the questions that follow
industrial preparation of ammonia and the process used in the manufacture of some ammonium compounds
(a) Give the name of the
  • (i) Process in step 1
  • (ii) Reaction that takes place in step 5
(b) State one other source of hydrogen gas apart from natural gas
(c) Explain why it  necessary to compress nitrogen and hydrogen in this process
(d) Write an equation for the reaction which takes place in step 6
(e) Name the catalyst and the reagents  used in step 3
      Catalyst
      Reagent
(f) Name compound Z1
(g) Give one commercial use  of compound Z2
Expected Response
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KCSE Chemistry Q & A - MODEL 1998.PP2.QN.1

24/10/2020

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KCSE Chemistry 1998 Topical Questions and Answers

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


(a) An ore is suspected to contain mainly iron. Describe a method that can be used to confirm the presence of iron in the ore
​(b) Excess carbon monoxide gas was passed over a heated sample of an oxide of iron as shown in the diagram below. Study the diagram and the data below it to answer the questions that follow.
Excess carbon monoxide gas was passed over a heated sample of an oxide of iron as shown in the diagram
​Mass of empty dish = 10.98g
Mass of empty dish 4 oxide of iron = 13.30g
Mass of empty dish 4 residue = 12.66g
  • (i) Determine the formula of the oxide of iron. (relative formula mass of oxide iron = 232, Fe = 56.0 , O = 16.0)
  • (ii) Write an equation for the reaction which took place in the dish

(c) Corrosive is a destructive process in which  iron which is converted into hydrated iron (III) oxide

State:
  • (i) two conditions necessary for rusting to occur
  • (ii) One method used to protect iron from rusting 

​(d) Explain why it is not advisable to wash vehicles using seawater
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KCSE Chemistry Q & A - MODEL 1998.PP2.QN.2

24/10/2020

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KCSE Chemistry 1998 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 following equations represents two different types of reactions

(i) nC4H8(g)  →    (C4H8)n(s)

(ii) C2H6(g) + CI2(g)  →    C2H5CI(I) + HCI(g)

State the type of reaction represented by:

(i)

(ii)

(b) The fermentation of glucose produces ethanol as shown in the equation below

C2H12O6(aq) → 2CH3CH2OH(aq) + 2CO2(g)

  • (i) State how the concentration of ethanol produced could be increased
  • (ii) State and explain the  observation that would be  made  when a piece of sodium metal is added to a sample of ethanol contained  in a beaker
  • (iii) Give two commercial uses of ethanol other in the manufacture of alcoholic drinks

​(c) The molecular formula of a hydrocarbon is C6H14. The hydrocarbon can be converted into two other hydrocarbons as shown by the equation below

(i) Name and draw the possible structural formula of X

Name Structural formula

(ii) State and explain the observation that would be made if a few drops of bromide water were added to a sample of X.

(iii) Write an equation for the complete combustion of C3H8

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KCSE Chemistry Q & A - MODEL 1998.PP2.QN.4

24/10/2020

Comments

 

KCSE Chemistry 1998 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 to prepare anhydrous chlorides of a number of elements in a laboratory where no fine cupboard was available. The chlorides were to be collected in flask
Picture
​The following table shows the melting and boiling points of the chlorides  that were prepared.
  • (a) Explain why  it is necessary to pass  dry chlorine through the apparatus before  heating each  element
  • (b) Give tow reasons why tubes II and III were filled with Soda lime (solid mixture of sodium hydrogen and calcium hydrogen)
  • (c) Explain why it would not be possible to collect any sodium chloride in flask 1
  • (d) Name one other substance that can be used in tubes II and III
  • (e) Write an equation for the reaction that forms phosphorous (III) chloride 
  • (f) Describe how you would separate a mixture of sodium chloride and aluminium chloride
​Expected Response
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More Quiz

(a) The table below gives the solubilities of hydrated copper (II) sulphate in mol dm3 at different temperatures

(i) On the grid provided, plot a graph of solubility of copper (II) sulphate (vertical axis) against temperature.

(ii) From the graph, determine the mass of copper (II) sulphate deposited when solution is cooled from 700C to 400C.

        (Molar mass of hydrated copper (II) sulphate = 250g)

(b) In an experiment to determine the solubility of sodium chloride, 5.0cm3 of a saturate solution of sodium chloride weighing 5.35g were placed volumetric and diluted to a total volume of 250cm3.

25.0cm3 of the dilute solution chloride completely reacted with 24cm3 of 0.1M silver nitrate solution.

AgNO3(aq) + NaCI(aq)  →    AgCl(s) + NaNO3(aq)

Calculate:

(i) Moles of silver nitrate in 24cm3 of solution

(ii) Moles of sodium chloride in 25.0cm3 of sodium

(iii) Moles of sodium chloride in 250cm3 of solution

(iv) Mass of sodium chloride in 5.0cm3 of saturated sodium chloride Solution (Na = 23.0, CI = 35.5)

(v) Mass of water in 5.0cm3 of saturated solution of sodium chloride

(vi) The solubility of sodium chloride in g/100 water

ANSWERS
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KCSE Chemistry Q & A - MODEL 1998.PP2.QN.5

24/10/2020

Comments

 

KCSE Chemistry 1998 Topical Questions and Answers

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


In order to determine the molar of neutralization of sodium hydroxide, 100cm3 of 1M sodium hydroxide and 100cm3 of 1 M hydrochloric acid both at the same initial temperature were mixed and stirred continuously with a thermometer. The thermometer of the resulting solution was recorded after every 30 seconds until the highest temperature of the solution was attained.

Thereafter the temperature of the solution was recorded for a further two minutes

(a)
  • (i) Why was it necessary to stir the mixture of the two minutes
  • (ii) Write an ionic equation for the reaction which took place
  • (iii) The sketch below was obtained when the temperature of the mixture were plotted against time. Study and answer the questions that follow.
In order to determine the molar of neutralization of sodium hydroxide

I. What is the significance of point Y2?

II. Explain why there is a temperature change between points;

Y1 and Y2

Y3 and Y4

(iv) In the initial temperature for both solutions was 24.50C and the highest temperature attained by the mixture was 30.90C

Calculate the:

I. heat change for the reaction (specific heat capacity of the solution = 4.2Jg -1K-1 and the density of the solution = 1.0g/cm3

II. Molar heat of neutralization of sodium hydroxide

(v) Explain how the value of the molar heat of neutralization obtained in this experiment would compare with the one that would be obtained if the experiment was repeated using 100cm3 of 1 Methanoic acid instead of hydrochloric acid.

(b) On the grid provided below, draw an energy level diagram for the reaction between hydrochloric acid and sodium hydroxide

Expected Response
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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.29

23/10/2020

Comments

 

KCSE Chemistry 1998 Topical Questions and Answers

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


What is the oxidation number of chlorine in CO4

​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.28

23/10/2020

Comments

 

KCSE Chemistry 1998 Topical Questions and Answers

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


The column below was used do soften hard water
The column below was used do soften hard water
  • (i) Explain how the hard water was softened as it passed through the column
  • (ii) After some time the material in the column  is not able to soften hard water
    How can the material be activated?
  • (iii) Give one advantage of using hard water for domestic purposes.
​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.27

23/10/2020

Comments

 

KCSE Chemistry 1998 Topical Questions and Answers

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


A hydrocarbon slowly decolorizes bromine gas in the presence of sunlight but does not decolourise acidified potassium permanganate
Name and draw the structural formula of the fourth member of the series to which the hydrocarbon belongs.
​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.26

23/10/2020

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KCSE Chemistry 1998 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 energy required to remove the outermost electron for some  group I elements
The table below gives the energy required to remove the outermost electron for some group I elements
​Arrange the elements in order of their reactivity starting with the most reactive
​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.25

23/10/2020

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KCSE Chemistry 1998 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 below shows the physical state of matter.  Study it and answer the questions that follow
25. The diagram below shows the physical state of matter. Study it and answer the questions that follow
​Identify the processes R, V, w and U
(c) Name one substance which can undergo the process represented by S and T.
​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.24

23/10/2020

Comments

 

KCSE Chemistry 1998 Topical Questions and Answers

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


A beekeeper found that when stung by a bee, application of a little solution of hydrogen carbonate helped to relieve the irritation from the affected area.  Explain.
​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.23

22/10/2020

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KCSE Chemistry 1998 Topical Questions and Answers

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


A sealed glass tube containing air at s.t.p was immersed in water at 1000c.  Assuming that there was no increase in the volume of the glass tube due to the expansion of the glass, calculate the pressure of the inside tube. 
​(standard pressure = 760mmHg,)
​Expected Response

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KCSE Chemistry Q & A - MODEL 1998.PP1.QN.22

22/10/2020

Comments

 

KCSE Chemistry 1998 Topical Questions and Answers

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


The scheme below shows some reaction sequence starting with solid N.
The scheme below shows some reaction sequence starting with solid N.
  • ​a) Identify solid N
  • b) Write the formula  of the complex ion present in solution
​Expected Response

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