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  • kcse form 2 mathematics questions

K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.7

29/10/2020

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KCSE Chemistry 2011 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 meant by molar heat of combustion? 
(b) State the Hess's Law.
c) Use the following standard enthalpies of combustion of graphite, hydrogen and enthalpy of formation of propane.
Picture
​(i) Write the equation for the formation of propane. 
(ii) Draw an energy cycle diagram that links the heat of formation of propane with its heat of combustion and the heats of combustion of graphite and hydrogen.
(iii) Calculate the standard heat of combustion of propane. 
Other than the enthalpy of combustion, state one factor which should be considered when choosing a fuel. 
(e) The molar enthalpies of neutralization for dilute hydrochloric acid and dilute nitric
(V) acid are -57.2kJ/mol while that of ethanoic acid is -55.2kJ/mol. Explain this. observation.
ANSWERS
(a) The amount of heat liberated when one mole of a substance is burnt in excess Oxygen.
(b) The heat evolved are absorbed in a chemical change is the same whether the change occurs in one step or through many steps. 
Picture
​(d)  cost
 effect on environment
 availability
 storage 
(e) Ethanoic acid is a weak acid therefore heat is used to ionize it before neutralization occurs . It value is therefore lower than that of hydrochloric acid which is fully ionized

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K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.6

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


(a) Study the flowchart below and answer  the questions that follows;
Picture
(i) I What observation will be made in Step I 
II Describe a chemical test that can be carried out to show the identity of compound C 
(ii) Give the names of the following
I E
II substance D 
(iii)Give the formula of substance B .
(iv) Name the type of reaction that occurs in:
I Step (II)
II Step (IV)
(v) Give the reagent and conditions necessary for Step (VI).
Reagent:
Conditions
(b) (i) Name the following structure.
Picture
(ii) Draw the structure of an isomer of pentene.
ANSWERS
​(a) (i) I The potassium permanganate is decolorized or changes from purple to colourless. 
II C is a ethanoic acid (carboxylic acid)
Add sodium carbonate, you will see effervescence, test gas evolved with lime water, it will form a white precipitate.
(ii) I Polyethene
II Substance D - sodium ethoxide 
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.5

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


(a) Other than their location in the atom, name two other differences between an electron and a proton.
(b) the table below gives the number of electrons ,protons and neutrons in particles A,B, C , D, E, F and G
Picture
​(i) Which particle is likely to be a halogen? 
(ii) what is the mass number of E
(iii) write the formula of the compound formed when E combines with G 
iv) Name the type of bond formed in (iii) above.
(v) How does the radii of C and E compare ? Give reason. 
(vi) Draw a dot (.) and cross(x) diagram for the compound formed between
(vii) Why would particle B not react with particle D?
ANSWERS
(a)- electron has I mass while proton has mass of one mass unit. 1840
- proton is positively charged while electron is negatively charged.
Picture
(iv)Ionic bond or electrostatic
(v)E has a smaller atomic radius than C 
E has more protons than C : nuclear attraction stronger.
Picture
(vii)Particle B is inert with a stable electronic configuration  will not react.

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K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.4

29/10/2020

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KCSE Chemistry 2011 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 excess calcium metal was added to 50 cm3 of 2 M aqueous copper (II) nitrate in a beaker, a brown solid and bubbles of gas were observed.
(i) "Write two equations for the reactions which occurred in the beaker.
(ii) Explain why it is not advisable to use sodium metal for this reaction.
​(b) Calculate the mass of calcium metal which reacted with copper (II) nitrate solution. (Relative atomic mass of Ca = 40) 
(c) The resulting mixture in (a) above was filtered and sodium hydroxide added to the filtrate dropwise until in excess. What observations were made? 
(d) (i) Starting with calcium oxide, describe how a solid sample of calcium carbonate can be prepared.
(ii) Name one use of calcium carbonate
ANSWERS
Picture
​(c)A white precipitate is formed which is insoluble in excess. 
(d) (I) Add dilute nitric (V) acid to calcium oxide to form the soluble salt calcium nitrate. Add sodium  carbonate (another soluble salt) to form insoluble.
Calcium Carbonate and sodium nitrate . Filter out  the calcium carbonate, wash it  with distilled water to remove traces of sodium nitrate and dry between filter papers 
(ii) Manufacture of cement
Manufacture of sodium carbonate. 

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K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.3

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


(a) Ethanol can be manufactured from ethene and steam as shown in the equation below:
Picture
Temperature and pressure will affect the position of equilibrium of the above reaction. Name the other factor that will affect the position of equilibrium of the above reaction. 
(b) The data in the table below was recorded when one mole of ethene was reacted with excess steam. The amount of ethanol in the equilibrium mixture was recorded under different conditions of temperature and pressure. Use the data to answer the questions that follow.
Picture
(i)State whether the reaction between ethene and steam is exothermic or endothermic.
Explain your answer. 
(ii) State and explain one advantage and one disadvantage of using extremely high pressure in this reaction.
I Advantage
II disadvantage
(c) In an experiment to determine the rate of reaction between calcium carbonate and dilute hydrochloric acid, 2g of calcium carbonate were reacted with excess 2 M hydrochloric acid, The volume of carbon (IV) oxide evolved was recorded at regular intervals of one minute for six minutes. The results are shown in the table below.
Picture
​(i) plot a graph of time in minutes on the horizontal axis against volume of carbon (IV) oxide on the vertical axis.
(ii) determine the rate of reaction at 4 minutes
ANSWERS
​(a) Increase or change in amount of reagent either reactants or products. 
(Concentration). 
(b) (i) Exothermic  increase in temperature from 250 - 350  at constant pressure  the amount of ethanol formed at equilibrium decreases. 
(ii) I Advantage - it would increase the yield of ethanol ; since increase in pressure will favour side with less moles i.e. the products. 
II Disadvantage - it would mean investment in equipment to withstand the high pressure and would be expensive.
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.2

29/10/2020

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KCSE Chemistry 2011 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 by a student to investigate the products formed when aqueous copper (II) chloride was electrolyzed using carbon electrodes.
Picture
(a) (i) Write the equation for the reaction that takes place at the cathode. 
(ii) Name and describe a chemical test for the product initially formed at the anode when a highly concentrated solution of copper (II) chloride is electrolysed. 
(iii) How would the mass of the anode change if the carbon anode was replaced
With copper metal? Explain. 
(b) 0.6 g of metal B were deposited when a current of 0.45A was passed through an electrolyte for 72 minutes. Determine the charge on the ion of metal B.
(Relative atomic mass of B = 59, 1 Faraday = 96 500 coulombs) 
(c) The electrode potentials for cadmium and zinc are given below:
Picture
​Explain why it is not advisable to store a solution of cadmium nitrate in a container made of zinc
ANSWERS
Picture
​(c)From the electrode potentials. zinc is more reactive than cadmium.( Therefore zinc will displace cadmium ions from solution hence the metal container will dissolve. 

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K.C.S.E Chemistry Q & A - MODEL 2011.PP2.QN.1

29/10/2020

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KCSE Chemistry 2011 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 some of the processes involved in large scale production of sulphuric (VI) acid. Use it to answer the questions that follow.
Picture
​a) Describe how oxygen is obtained from air on a large scale 
(b) (i) Name substance A.
(ii)Write an equation for the process that takes place in the absorption chamber. 
(c) Vanadium (V) oxide is a commonly used catalyst in the contact process.
(i) Name another catalyst which can be used for this process. 
(ii) Give two reasons why vanadium (V) oxide is the commonly used catalyst. 
(d) State and explain the observations made when concentrated sulphuric (VI) acid is added to crystals of copper (II) sulphate in a bearer. 
(e) The reaction of concentrated sulphuric (VI) acid with sodium chloride produces hydrogen chloride gas. State the property of concentrated sulphuric (VI) acid , illustrated in this reaction. 
(f) Name four uses of sulphuric (VI) acid
ANSWERS
Picture
  •  Manufacture fertilizers e.g. Super phosphate
  •  Production of rayon fibres
  •  Car batteries as electrolyte
  •  Sulphur detergents
  •  Cleaning of metals (Pickling)
  •  Paints 

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.31

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


What name is given to elements which appear in group (II) of the periodic table?
ANSWER
  • Alkaline earth metals.

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.30

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


A sample of river water is suspected to contain zinc and sulphate ions.
Describe how the presence of zinc ions and sulphate ions can be established.
ANSWERS
  • Add aqueous ammonia to fill M in excess.
  • A formation of white precipitate which dissolves in excess shows presence of zinc ions. 
  • Add aqueous acified Barium Nitrate
  • Formation of a white precipitate shows
  • Presence of sulphate ions

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.29

29/10/2020

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KCSE Chemistry 2011 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 following substances conduct an electric current.
(a) Magnesium metal. 
(b) Molten magnesium chloride.
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.28

29/10/2020

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KCSE Chemistry 2011 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 bonding between aluminium chloride and ammonia.
Picture
​(a) Name the types of bonds that exist in the molecule.
(b) How many electrons are used for bonding in the molecule?
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.27

29/10/2020

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KCSE Chemistry 2011 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 some processes involved in the extraction of zinc metal:
Picture
​a) Name oneore from which zinc is extracted. 
b) Write the equation of the reaction taking place in unit II 
c) Name two uses of zinc metal.
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.26

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


The data given below was recorded when Metal M was completely burnt in air. M is not the actual symbol of the metal. (RA.M; M = 56, O ==16) 
Mass of empty crucible and lid = I0.240g 
Mass of crucible, ;lid and metal M = 10.352g 
Mass crucible, lid and metal oxide = 10.400g
(a) Determine the mass of:
(i) Metal M 
(ii) oxygen. 
(b) Determine the empirical formula of the metal oxide.
ANSWERS
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.25

29/10/2020

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KCSE Chemistry 2011 Topical Questions and Answers

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


(a) State the Gay Lussac's Law.
(b) 10cm3 of a gaseous hydrocarbon, C2HX required 30cm3 of oxygen for complete combustion. If steam and 20cm3 of carbon (IV) oxide were produced, what is the value of X?
ANSWERS
Picture

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K.C.S.E Chemistry Q & A - MODEL 2011.PP1.QN.24

29/10/2020

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KCSE Chemistry 2011 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 number of electrons, protons and neutrons in substances X, Y and Z. Study it and answer the questions that follow.
Picture
​(a) Which letter represents an ion?  
(b) Which of the substances are isotopes? Give a reason.
ANSWERS
(a) Y
(b) Y and Z 
They have the same number of protons (8) but different atomic masses. 

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