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  • kcse form 2 mathematics questions

K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.7

9/10/2020

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KCSE Chemistry 2006 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 volumes of nitrogen dioxide gas produced when different volume of 1M nitric acid were each reacted with 2.07 g of lead at room temperature.
a) Give a reason why nitric acid is not used to prepare hydrogen gas. 
b) Explain how the rate of the reaction between lead and nitric acid would be affected if the temperature of the reaction mixture was raised. 
c) On the grid provided below, plot a graph of the volume of the gas produced (Vertical axis) against volume of acid.
Picture
d) Using the graph, determine the volume of
:i) Nitrogen dioxide produced when 30cm3 of 1 M nitric acid were reacted with 2.07 g of lead
 ii) 1M nitric acid which would react completely with 2.07g of lead.
e) Using the answer in d(i) above,
determine:
i) The volume of 1M nitric acid that would react completely with one mole of lead (Pb=207)
 ii) The volume of nitrogen dioxide gas produced when one mole of lead reacts with excess 1 M nitric room temperature.
 f) Calculate the number of moles of:
 i) 1M nitric acid that reacted with one mole of lead
 ii) nitrogen dioxide produced when one mole of lead were reacted with excess nitric acid. (Molar gas volume of 2400cm3)
 g) Using the answers obtained in f (i) and (ii) above, write the equation for the reaction between lead and nitric acid given that one mole of lead nitrate and two moles of water were also produced.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.6

9/10/2020

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KCSE Chemistry 2006 Topical Questions and Answers

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


The extraction of iron from its ores takes place in the blast furnace. Study it and answer the questions that follow.
Picture
​a) Name
(i) One of the substances in the slag 
(ii) Another iron ore material used in the blast furnance. 
(iii) One gas which is recycled. 
b) Describe the process which leacd to the formation of iron in the blast furnace
c) State the purpose of limestone in the blast furnace. 
d) Give a reason why the melting point of the iron obtained from the blast furnace is 12000 C while tat of pure iron is 15350C 
(e) State two uses of steel
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.5

9/10/2020

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KCSE Chemistry 2006 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 name is given to a compound that contains carbon and hydrogen only? 
b) Hexane is a compound containing carbon and hydrogen.
(i) What method is used to obtain hexane from crude oil? 
(ii) State one use of hexane 
c) Study the flow chart below and answer the questions that follow.
Picture
​(i) Identify reagent L. 
(ii) Name the catalyst used in step 5. 
(iii) Draw the structural formula of gas J. 
(iv) What name is given to the process that takes place in step 5? 
d) (i) write the equation for the reaction between aqueous sodium hydroxide and aqueous ethanoic acid. 
(ii) Explain why the reaction between 1g of sodium carbonate and 2M hydrochloric acid is faster than the reaction between 1g of sodium carbonate and 2M ethanoic acid.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.4

9/10/2020

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KCSE Chemistry 2006 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 some processes that take place during the industrial manufacture of sulphuric acid.
Picture
(i) Write the equation for the reaction in which sulphur dioxide gas is produced. 
(ii) Why is it necessary to keep the gases pure and dry ? 
(iii) Describe the process that takes place in chamber G. 
(iv) Name the gases that escape into the environment.
(v) State and explain the harmful effect on the environment of one of the gases named in (iv) above 
(vi) Give one reason why it is necessary to use a pressure of 2-3 atmospheres and not more. 
b) (i) Complete the table below to show the observations made when concentrated sulphuric acid is added to the substances shown.
Picture
​(ii) Give reasons for the observations made using:
I iron fillings 
II Crystals of white sugar. 
(c) Name one fertilizer made from sulphuric acid. 
(d) Suggest a reason why BaSO4(a pigment made from sulphuric acid) would be suitable in making paint for cars.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.3

9/10/2020

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KCSE Chemistry 2006 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 isotopes and allotropes. 
b) The chart below 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
i) Select the element in period three which has the shortest atomic radius. Give a reason for you answer. 
ii) Element F has the electronic structure, 2.8.18.4 on the chart above, indicate the position of element F. 
iii) State one use of the elements of which E is a member. 
iv) Write an equation to show the action of heat on the nitrate of element C.
c) When 3 litres of chlorine gas were completely reacted with element D, 11.875g of the product were formed. Determine the relative atomic mass of element D.
(Atomic mass of chlorine = 35.5; molar gas volume = 24litres)
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.2

9/10/2020

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KCSE Chemistry 2006 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 an experiment to determine the molar heat of reaction when magnesium displaces copper ,0.15g of magnesium powder were added to 25.0cm3 of 2.0M copper (II) chloride solution. The temperature of copper (II) chloride solution was 25°C.While that of the mixture was 43°C.
 i) Other than increase in temperature, state and explain the observations which were made during the reaction.
ii) Calculate the heat change during the reaction (specific heat capacity of the solution = 4.2jg-1k-1and the density of the solution = 1g/cm3
iii) Determine the molar heat of displacement of copper by magnesium.(Mg=24.0).
iv) Write the ionic equation for the reaction.
v) Sketch an energy level diagram for the reaction.
b) Use the reduction potentials given below to explain why a solution containing copper ions should not be stored in a container made of zinc.
Picture
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP2.QN.1

9/10/2020

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KCSE Chemistry 2006 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 an electrolyte? 
b) State how the following substances conduct electricity.
i) Molten calcium chloride 
ii) Graphite. 
c) The diagram below shows a set up that was used to electrolyse aqueous magnesium sulphate.
Picture
​i) On the diagram above, using an arrow, show the direction of flow of electrons. 
ii) Identify the syringe in which hydrogen gas would be collected. Explain 
d) Explain why the concentration of magnesium sulphate was found to have increased at the end of the experiment. 
e) During the electrolysis, a current of 0.72A was passed through the electrolyte for 15 munities. Calculate the volume of gas produced at the anode.(1 Faraday = 96 500 coulombs; molar gas volume is 24000cm3 at room temperature).
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.28

8/10/2020

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KCSE Chemistry 2006 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 diagram below and answer the questions that follow.
Picture
a) What do ΔH1 and ΔH2 represent? 
b) Write an expression to show the relationship between ΔH1,ΔH2 and ΔH3.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.27

8/10/2020

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KCSE Chemistry 2006 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 flow chart below and answer the questions that follow.
Picture
a) Name reagent z.
b) Describe the process which takes place in step 2.
c) Identify the white solid.
ANSWERS
a)Conc. H2SO4
b)Heat the solution to concentrate it.  Allow for crystal for form.  Filter.
c)Anhydrous copper(II) Sulphate

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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.26

8/10/2020

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KCSE Chemistry 2006 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 a curve obtained when water at 20°C was heated for 15 minutes.
Picture
a) What happens to the water molecules between points W and x? 
b) In which part of the curve does a change of state occur? 
c) Explain why the temperature does not rise between points X and Y.
ANSWERS
a)They gain energy and move faster.  The intermolecular distance increases.
b)XY
c)The energy supplied changes molecules of water from liquid to Gaseous state. ​

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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.25

8/10/2020

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KCSE Chemistry 2006 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 properties of substances V1 to V4 in the table below and answer the questions that follow.
Picture
​a) Which of the substances are liquids at 240C?
b) Describe how a mixture containing V2 and V4 can be separated
ANSWERS
​a)V1 and V3
b)Add petrol to the mixture.  Filter.  V2 is the residue.  Filtrate is V4  
Distill the filtrate.

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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.24

8/10/2020

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KCSE Chemistry 2006 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 table below to show the colour of the given indicator in
Picture
b) How does the PH value of 0.1 M potassium hydroxide solution compare with that of 0.1M aqueous ammonia? Explain.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.23

8/10/2020

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KCSE Chemistry 2006 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 the boiling point of ethanol is higher than that of hexane.
(Relative molecular mass of ethanol is46 while that of hexane is 86)
ANSWERS
  • In addition to van der waals forces, strong hydrogen bonds exist in ethanol.
  • These bonds require more energy to break

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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.22

8/10/2020

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KCSE Chemistry 2006 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 represents part of a set – up used to prepare and collect gas T.
Picture
a) Name two reagents that are reacted to produce both carbon (IV) oxide and carbon(II) oxide.
b) Write the equation for the reaction which takes place in the wash bottles.
c) Give a reason why carbon(II) oxide is not easily detected.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2006.PP1.QN.21

8/10/2020

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KCSE Chemistry 2006 Topical Questions and Answers

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


(a) Explain why the metals magnesium and aluminium are good conductors of electricity. 
b) Other than cost, give two reasons why aluminium is used for making electric cables while magnesium is not
ANSWERS
a)They have delocalized valency electrons
b)Aluminium has three delocalized electrons.
It is resistant to corrosion

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