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  • kcse form 2 mathematics questions

K.C.S.E Chemistry Q & A - MODEL 1995PP1QN09

5/10/2020

Comments

 
K.C.S.E Chemistry Q & A - MODEL 1995PP1QN09

​​Study the set – up below and answer the question that follows.
Picture
​​State and explain the observations that would be made when the circuit is completed.

​K.N.E.C Marking Scheme
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KCSE Chemistry Q & A - MODEL 1996.PP1.QN.25

3/10/2020

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KCSE Chemistry 1996 Topical Questions and Answers

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


A polymer has the following structure:
A polymer has the following structure:
A sample of this polymer if found to have a molecular mass of 5194.  Determine the number of monomers on the polymer (H=1.0, C= 12.0, N = 14.0)
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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.7

28/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


(a) The diagram below shows a set-up that can be used to obtain nitrogen gas in an experiment.

The diagram below shows a set-up that can be used to obtain nitrogen gas in an experiment

(i)    Name liquid L    (1mk)

(ii)    What observation would be made in tube K after heating for some time?    (1mk)

(iii)    Write an equation for the reaction that took place in tube K.       (1 mk)

(iv)    If 320 cm3 of ammonia gas reacted completely with the copper?

Calculate:    

    I    Volume of nitrogen gas produced.    (1mk)

    II    the mass of copper oxide that reacted    (3mks)

    (Cu = 63.5, O=16.O, one mole of gas occupies 24 liters at room temperature and pressure)

(v)    At the end of experiment the PH of the water in the beaker was found to be about  ______________________

        Explain        (2mks)

(b)    In another experiment a gas jar containing ammonia was inverted over a burning splint.  What observation would be made?    (1mk)

(c)    Why is it advisable to obtain nitrogen from air instead ammonia?    (1mk)

expected response
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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.5

28/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The flow charts below show an analysis of a mixture R that contains two salts. Study the analysis and answer the questions that follow.

The flow charts below show an analysis of a mixture R that contains two salts. Study the analysis and answer the questions that follow.Picture

(a)

(i) What condition is necessary for the process in step I to take place?(1mk)

(ii) Draw a labeled diagram for the set-up that could be used to separate the mixture formed in step II (2mks)

(iii) Write ionic equation for the reaction between the cation in filtrate X and aqueous ammonia. (1mk)

(iv) What observation would indicate the presence of NO2 (g) in step I (v) State how water vapour, in step I could be identified. (1mk)

(b)

What conclusion can be drawn from step iV only Explain

(i)    What conclusion can be drawn from step IV only? Explain?     (2mks)

(ii)    Write the formula of an anion present in the residue U.  Explain?      (2mks)

(iii)    Suggest the identity of the cation present in solution z.    (1mk)

(c)    Name the two salts present in the mixture R.    (2mks)

expected response
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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.6

28/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


(a) The table below gives information about the major constituents of crude oil. Study it and answer the questions that follow.

Picture

(i)    Which one of the constituents or crude oil has molecules with the highest number of carbon atoms? (2mks)

(ii)    Name the process you would use to separate a mixture of petrol and diesel and explain how the separation takes place.    (2mks)

(iii)    Explain why the constituent of crude oil and write its formula    (1mk)

(iv)    Name one gas that is likely to be a constituent of crude oil and write its formula.     (1mk)

(b)    What condition could cause a poisonous gas to be formed when Kerosene is burnt? Explain    (2mks)

(c)    Give one use of bitumen    (1mk)

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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.4

27/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The flow chart below outlines some of the process involved during extraction of copper from copper pyrites. Study it and answer the questions that follow.

The flow chart below outlines some of the process involved during extraction of copper from copper pyrites. Study it and answer the questions that follow.

    (i)    Name gas K        (1mk)
    (ii)    Write an equation for the reaction that takes place in the 1st roasting furnace.    (1mk)
    (iii)    Write the formula of the cation present in slag M            (1mk)
    (iv)    Identify gas p        (1mk)
    (v)    What name is given to the reaction that takes place in chamber N? Give a reason for the answer.    (1mk)

(b)    The copper obtained from chamber N is not pure.  Draw a labeled diagram to show the set up you would use to refine the copper by electrolysis. (3mks)

(c)    Given that the mass of copper obtained from above extraction was 210kg, determine the percentage purity of the ore(copper pyrites) if 810kg of it was fed to the 1st  roasting furnace. 

        (Cu = 63.5, Fe = 56.0, s=32.0)      (3mks)

(d)    Give two effects that this process could have on the environment (2mks)

expected response
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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.3

27/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


In an experiment to determine the heat of combustion of methanol, CH2OH a student used a set up like the one shown in the diagram below.

In an experiment to determine the heat of combustion of methanol, CH2OH a student used a set up like the one shown in the diagram below.

Volume of water     =     500cm3

Final temperature of water    =    27.00C

Initial temperature of water     =   20.00C

Final mass of lamp + methanol    =    22.11g

Initial mass of lamp+ methanol    =    22.98g

Density of water      =     1.0g cm3

a)    Write an equation for the combustion of methanol

b)      Calculate:

    (i)    The number of moles of methanol used in this experiment 

            (C = 12; O = 16; H = 1)

    (ii)    The heat of combustion per mole of methanol.       (1mk)

    (iii)    The heat of combustion per mole of methanol        (2mks)

(c)    Explain why the value of the molar heat of combustion for methanol obtained in this experiment is different from the theoretical value.

(d)    On the axis below draw an energy level diagram for the combustion of methanol.

expected response
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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.2

27/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


a) In an experiment hydrogen chloride gas was prepared and reacted with aluminium turnings to form a solid q and gas R as shown in the diagram


Picture

(i) Name: Liquid P :

Solid Q (1mk) :

Gas R (1mk)

(ii) Name another substance that could serve the same purpose as the concentrated sulphuric acid. (1mk)

(iii) Explain the following observation. When blue litmus paper was dipped into the water in the beaker at the end of the experiment it turned red. Explain why solid Q collects farther away from the heated aluminium (2mks)

(b)

(i) Write an equation for the reaction that takes place between ammonia gas and hydrogen gas (1mk)

(ii) Calculate the mass of the product that would be formed when 2000cm3 of hydrogen chloride gas reacts completely with excess ammonia gas (H=1, O; N= 14.0, C1 = 35.5, one mole of gas occupied 24 litres at room temperature and pressure.) (3mks)

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K.C.S.E Chemistry Q & A - MODEL 1995.PP2.QN.1

27/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The table below gives information on four elements by letters K, L, M and N. Study it and answer the questions that follow. The letters do not represent the actual symbols of the elements.

Picture

a) Which two elements have two similar properties? Explain (2mks)
b) What is most likely formula of oxide of L? (1mk)
c) Which element is a non-metal? Explain (1 mk)
d) Which one of elements is the strongest reducing agent? Explain (2mks)
e) Explain why ionic radius of N is less than that of M (2mks)
f) Explain why the ionic radius of L is bigger than its atomic radius (2mks)

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K.C.S.E Chemistry Q & A - MODEL 1995.PP1.QN.29

26/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


During the production of hydrogen iodide, hydrogen reacts with iodine according to the equation:
Picture

Explain how the following would affect the yield of hydrogen iodide:

a) Increase in temperature

b) Increase in pressure. (2mks)

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K.C.S.E Chemistry Q & A - MODEL 1995.PP1.QN.28

26/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


A compound C4H10O_ is oxidized by excess acidified potassium permanganate to form another compound C4H8O2. The same compound C4H10O reacts with potassium to produce hydrogen gas. 

a) Draw the structural formula and name the compound CaH10O (1mk) 

b) Write an equation for the reaction between potassium and compound C4H10O.

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K.C.S.E Chemistry Q & A - MODEL 1995.PP1.QN.30

26/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


a) 100gm of radioactive 233 Pa was reduced to 12.5g after 81 days.

        91

        Determine the half-life of Pa. (2mks)

b) 233 Pa decays by beta emission.

    What is the mass number and 91 Atomic number of the element formed? (1mk)

Expected Response
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K.C.S.E Chemistry Q & A - MODEL 1995.PP1.QN.25

25/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Describe how the following reagents can be used to prepare lead sulphate solid potassium sulphate, solid lead carbonate, dilute nitric acid and distilled water.

Expected Response
Dissolve the potassium sulphate (1/2) in water, dissolve (1/2) the lead carbonate in the nitric acid, mix the two solutions (1/2) and filter (1/2) off the lead sulphate precipitate//Dissolve lead carbonate in nitric acid add solid pbSO4 and filter off (max1 ½)//Dissolve this in HNO3 and add solid pbCO3 and filter off the precipitate.

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K.C.S.E Chemistry Q & A - MODEL 1995.PP1.QN.27

25/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Give a reason why calcium hydroxide solution is used to detect the presence of carbon dioxide gas while sodium hydroxide in NOT?

Expected Response

Ca (OH)2(aq) forms white precipitate (1/2) with CO2 Can be observed NaOH(1/2)(aq) does not form a precipitate. (1mk)


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K.C.S.E Chemistry Q & A - MODEL 1995.PP1.QN.23

25/9/2020

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KCSE Chemistry 1995 Topical Questions and Answers


All Questions Feature Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Explain the following observation. A chloride dissolves in water to form an electrolyte while the same chloride dissolves in methylbenzene to for a non – electrolyte. (1mk)

Expected Response
The chloride form ions in water which conduct electric current. NO ions are formed in methylbenzene /chloride exists in methylbenzene as molecules. (2mks)

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    chemistry topical questions and answers for kcse exams

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