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  • kcse form 2 mathematics questions

K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.7

21/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


(a) Define the standard enthalpy of formation of a substance 
(b) Use the thermochemical equations below to answer the questions that follow.
Picture
(i) Name two types of heat changes represented by ΔH3
(ii) Draw an energy level diagram for the reaction represented by equation 1
(iii) Calculate the standard enthalpy of formation of ethane
(iv) When a sample of ethane was burnt, the heat produced raised the temperature of 500g of water by 21. 5 K, (specific heat capacity of water = 4.2Jg-1K).
Calculate the:
 I. Heat change for the reaction
 II. Mass of ethane was burnt. ( relative formula mass of ethane= 30)
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.6

21/10/2020

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KCSE Chemistry 2008 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 a set up that can be used to electrolyze aqueous copper (II) sulphate.
Picture
​(a) (i) Describe how oxygen gas is produced during the electrolysis 
(ii) Explain why copper electrodes are not suitable for this electrolysis
(b) Impure copper is purified by an electrolytic process
(i) Name one ore from which copper is obtained 
(ii) Write the equation for the reaction that occur at the cathode during the purification of copper 
(iii) In an experiment to electroplate a copper spoon with silver, a current of 0.5 A was passed for 18 minutes. Calculate the amount of silver deposited on the spoon (π = 96500 coulombs, Ag = 108)
(iv) Give two reasons why some metals are electroplated
ANSWERS
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.5

21/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


(a) Alkanes, alkenes and alkynes can be obtained from crude oil. Draw the structure of the second member of the alkyne homologous series. 
(b) Study the flow chart below and answer the questions that follow
Picture
(i) State the conditions for the reaction in step 1 to occur 
(ii) Identify substance II 
(iii) Give:
I. One advantage of the continued use of substance such as J
II The name of the process that takes place in step III 
III The name and the formula of substance K 
Name:
Formula:
(iv) The relative molecular mass of J is 16,800. Calculate the number of monomers that make up J.
(c) The table below give the formula of four compounds L,M,N and P
Picture
​Giving a reason in each case, select the letter which represents a compound that:
(i) Decolorizes bromine in the absence of UV light 
(ii) Gives effervescence when reacted with aqueous sodium carbonate
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.4

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


a) (i) State the Le chatelier‟s principle. 
(ii) Carbon (II) oxide gas reacts with steam according to the equation;
CO(g) + H2O(g)→ H2(g)+ CO2(g)
What would be the effect of increasing the pressure of the system at equilibrium? Explain. 
b) The table below gives the volumes of oxygen gas produced at different times when hydrogen peroxide decomposed in the presence of a catalyst.
Picture
​(i) Name the catalyst used for this reaction 
(ii) On the grid provided, draw the graph of volume of oxygen gas produced (vertical axis) against time. 
(iii) Using the graph, determine the rate of decomposition of hydrogen peroxide after 24 seconds. 
(iv) Give a reason why the total volume of oxygen gas produced after 50 seconds remains constant.
ANSWERS
​(a)(i) When change  is made to a system in equilibrium the System moves so as to oppose the change.
(ii)Pressure  has no effect to equilibrium
The moles/Volume/ molecules of gases is reactants and product are equal 
(iii) DH –ve ( negative)
Since lowering of temperature moves to equilibrium to direction which heat is produced. Decrease in temperature favours exothermic reaction
(b) (i) Manganese IV oxide
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K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.3

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


​(a) Describe the process by which Nitrogen is obtained from air on a large scale.
(b) Study the flow chart below and answer the questions that follow.
Picture
​(i) Identify gas J. 
(ii) Using oxidation numbers, show that ammonia is the reducing agent in step (VI) 
(iii) Write the equation for the reaction that occurs in step (V). 
(iv) Give one use of ammonium nitrate. 
c) The table below shows the observations made when aqueous ammonia was added to cations of elements F2F and G until in excess.
Picture
(i) Select the cation that is likely to be Zn2+
(ii) Given that the formula of the cation of element E is E 2+, write the ionic equation for the reaction between E2+ (aq) and aqueous ammonia.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.2

20/10/2020

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KCSE Chemistry 2008 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 
b) The table below gives information about elements A1,A2,A3, and A4
Picture
(i) In which period of the periodic table is element A2? Give a reason
(ii) Explain why the atomic radius of:
I A1 is greater than that of A2;
II A4 is smaller than its ionic radius 
(iii) Select the element which s in the same group as A3 
(iv) Using dots (.) and crosses(x) to represent outermost electrons. Draw a diagram to show the bonding in the compound formed when A1 reacts with A4
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2008.PP2.QN.1

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


a) Biogas is a mixture of mainly carbon (IV) oxide and methane.
(i) Give a reason why biogas can be used as a fuel. 
(ii) Other than fractional distillation, describe a method that can be used to determine the percentage of methane in biogas. 
b) A sample of biogas contains 35.2% by mass of methane. A biogas cylinder contains 5.0 kg of the gas.
Calculate the;
(i) Number of moles of methane in the cylinder. (Molar mass of methane=16)
(ii) Total volume of carbon (IV) oxide produced by the combustion of methane in the cylinder (Molar gas Volume=24.0 dm-3+ at room temperature and pressure). 
c) Carbon (Iv) oxide, methane, nitrogen (I) oxide and trichlorofluoromethane are green-house gases.
(i) State one effect of an increased level of these gases to the environment. 
(ii) Give one source from which each of the following gases is released to the environment;
I Nitrogen (i) oxide 
II Trichlorofluoromethane.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.31

20/10/2020

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KCSE Chemistry 2008 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) Give the name of the process that takes place in step 1. 
b) Give;
(i) The name of substance G1
(ii) One use of substance F1
ANSWERS
(a) Neutralization
(b)(i)Calcium hydrogen carbonate
(ii)Drying agent
  Extraction of sodium metal

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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.30

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


Crude oil contains sulphur. What would be the effect to the environment of using fuel containing sulphur?
ANSWERS
  • It burns to form SO2SO3 which is a pollutant
  • Accept any other effect e.g. – Acid rain
  • - Corrosion of buildings
  • -  Irritation of respiratory systems
  •  Yellowing of leaves of plants

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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.29

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


A certain mass of a metal E1 reacted with excess dilute hydrochloric acid at 25°C. The volume of hydrogen gas liberated was measured after every 30 seconds. The results were presented as shown in the graph below.
a) Name one piece of apparatus that may have been used to measure the volume of gas liberated. 
b) (i) On the same axis, sketch the curve that would be obtained if the experiment was repeated at 35°C. 
(ii) Explain the shape of your curve in b(i) above.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.28

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


During the extraction of aluminium from its ores; the ore is first purified to obtain alumina.
Picture
​a) Name
(i) Substance C1 
(ii) Process D1 
b) Give two reasons why aluminium is used extensively in the making of cooking pans.
ANSWERS
​(a)(i)Cryolite
(ii)Electrolysis
(b)Good conductor
Does not rust
Malleable
Light
High M.P
Does not corrode easily 

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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.27

20/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


In an experiment to determine the percentage of magnesium hydroxide in an anti-acid, a solution containing 0.50 g of the anti-acid was neutralized by 23.0 cm3 of 0.010m hydrochloric acid (Relative formula mass of magnesium hydroxide =58)
 a) Mass of magnesium hydroxide in the anti-acid;
b) Percentage of magnesium hydroxide in the anti-acid
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.26

20/10/2020

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KCSE Chemistry 2008 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 B1 was heated, a gas which formed a white precipitate when passed through lime water was produced. The residue was dissolved in dilute nitric (V) acid to form a colourless solution B2. when dilute hydrochloric acid was added to solution B2 a white precipitate which dissolved on warning was formed.
a) Write the formula of the;
I Cation in solid B1 
II anion in solid B1 
b) Write an ionic equation for the reaction between the resdue and dilute nitric (V) acid.
ANSWERS
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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.25

19/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


Picture
Give the name of the:
a) Process taking place between t0 and t1. 
b) Energy change that occurs between t3 and t4
ANSWERS
(a)Cooling
(b)Latent heat of fusion

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K.C.S.E Chemistry Q & A - MODEL 2008.PP1.QN.24

19/10/2020

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KCSE Chemistry 2008 Topical Questions and Answers

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


a) A radioactive substance emits three different particles.
Give the symbol of the particle with the highest mass. 
b) (i) Find the values of Z1 and Z2 in the nuclear equation below
Picture
iii) What type of nuclear reaction is represented in represented in b (i) above?
ANSWERS
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