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  • kcse form 2 mathematics questions

K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.6

25/11/2020

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KCSE Chemistry 2018 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 Kenya, sodium carbonate is extracted from trona at Lake Magacli.
(i) Give the formula of trona. 
(ii) Name the process of extracting sodium carbonate from trona. 
(b) The flow chart in Figure 5 summarises the steps involved in the production of sodium carbonate.
Use it to answer the questions that follow.
Picture
​(i) Name the process illustrated in Figure 5. 
(ii) Identify the starting raw materials required in the production of sodium carbonate. 
(iii) Write equations for the two reactions that occur in the carbonator. 
(iv) Name two substances that are recycled. 
(v) Identify:
Solid X; 
Process W. 
(vi) Write an equation for the reaction that produces solution Z. 
(vii) Apart from softening hard water, state two other uses of sodium carbonate.
 
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.5

25/11/2020

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KCSE Chemistry 2018 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 in Figure 4 was used to prepare hydrogen chloride gas which was passed over heated iron powder.
Picture
(i) Give a pair of reagents that will produce hydrogen chloride gas in flask A. 
(ii) Name the substance in flask B. 
(iii) State the observation made in the combustion tube. 
(iv) Write an equation for the reaction in the combustion tube. 
(v) Describe a chemical test for hydrogen chloride gas. 
(b) (1) Identify the gas that burns at the jet. 
(ii) Explain why the gas in (b) (I) is burned.
(c) Give reasons why excess hydrogen chloride gas is dissolved using the funnel arrangement. 
(d) State what will be observed when the reaction in the combustion tube is complete.
(e) Another experiment was carried out where hydrogen chloride gas was bubbled through methylbenzene and water in separate beakers. The resulting solutions were tested with blue litmus papers and marble chips.
(i) Write the observations made in the following table.
Picture
​(ii) Explain the observations in (e) (i). 
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.4

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


​An experiment was carried out to prepare crystals of magnesium sulphate. Excess magnesium powder was added to 100 cm3 of dilute sulphuric (VI) acid in a beaker and warmed until no further reaction took place. The mixture was filtered and the filtrate evaporated to saturation, then left to cool for crystals to form.
(a) (i) Write an equation for the reaction. 
(ii) Explain why excess magnesium powder was used. 
(iii) State how completion of the reaction was determined. 
(iv) What is meant by a saturated solution? 
(v) Explain why the filtrate was not evaporated to dryness. 
(b) When bleaching powder, CaOCl2, is treated with dilute nitric(V) acid, chlorine gas is released. This reaction can be used to determine the chlorine content of various samples of bleaching powders and liquids.
(i) Write an equation for the reaction of nitric(V) acid with bleaching powder.
(ii) Calculate the volume of chlorine produced when 10g of CaOCl2 is treated with excess nitric (v) acid. (Ca = 40.0; 0 = 16.0; Cl = 35.5; 1 mole of gas occupies 22.4dm3 at s.t.p) 
(c) Apart from use of chlorine gas in bleaches and water treatment, state two other uses of chlorine gas.
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.3

25/11/2020

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KCSE Chemistry 2018 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 Table I by indicating the observations, type of permanent or temporary change and name of new compound formed.
Picture
(b) Use the set-up in Figure 3 to answer the questions that follow. The flask was covered with a cloth that had been soaked in ice-cold water.
Picture
(i)State the observation made on the coloured water. Explain.
(ii) Name the gas law illustrated in Figure 3. 
(c)Use the standard electrode potentials in Table 2 to answer the questions that follow.
Picture
​(i)Write the half-cell representation for the element whose electrode potential is for hydrogen. 
(ii) Arrange the elements in order of reducing power, starting with the weakest reducing agent. 
(iii) I Select two half cells which combine to give a cell with the least e.m.f. 
II Calculate the e.m.f of the half cells identified in (iii) I. 
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.2

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


Figure 2 is a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of elements.
Picture
(a) (i) Select elements which belong to the same chemical family.
(ii) Write the formulae of ions for elements in the same period.
(b) The hrst ionisation energies of two elements K and M at random are 577 kJ/mol and 494 kJ/mol 
(i) Write equations for the 1ˢᵗ ionisation energies for elements K and M and indicate their energies.
(iii) Write the formula of the compound formed when L and I react.
(iv) Give one use of elemcnt V.
(c) (i) State anothcr group that G can be placcd in Figure 1. Explain. 
(ii) How do the reactivity of elements J and K compare? Explain. 
(d) (i) Elements L and M form chlorides.
​Complete the following table by writing the formulae of each chloride and state the nature of the solutions.
Picture
​(ii) The chloride of element M vapourises easily while its oxide has a high melting point. Explain.
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.1

25/11/2020

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KCSE Chemistry 2018 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 in figure I shows some natural and industrial processes. Study it and answer the questions that follows
Picture
​(a) Identify the processes labelled: 
A...................
B...................
C...................
D...................
(b) State the reagents and conditions required for processes B and D.
(i) Process B:
Reagent................
Conditions ............ 
(ii) Process D:
Reagent................
Conditions ............ 
(iii) Describe how process D is carried out.
(iv) State two additives used to improve the quality of soap.
(c) State the reagents required in steps F and G.
(iii) Draw the structure of terylene.
(d) (i) Name the polymer formed in step C.
(ii) State one disadvantage of the polymer formed in (d) (i).
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.28

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


Distinguish between empirical and molecular formula of a compound.
ANSWERS
  • Empirical formula shows the simplest whole number ratio of the moles of atoms of different elements in a compound while the molecular formula shows the actual number of atoms of various elements present in one molecule of the compound.

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.27

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


(NH4)2HPO4 is a fertilizer used by farmers to boost their crop production.
(a) Calculate the mass of phosphorus in a 20 kg packet 14.0; H = 1.0; P = 31.0; 0 16.0)
(b) State one advantage of this fertilizer, (NH4)2HPO4 over urea CO(NH2)2
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.26

25/11/2020

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KCSE Chemistry 2018 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 commercial indicators are preferred to flower exacts as acid-base indicators.
ANSWERS
  • The composition of commercial indicators remains constant. hence gives consistent results.
  • The composition of flower extracts change with time giving inconsistent results.

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.25

25/11/2020

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KCSE Chemistry 2018 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 a solution of sodium chloride Conducts electricity while that of sugar does not.
ANSWERS
  • A solution of sodium chloride contains ions which are free to conduct electricity while that of sugar contains molecules hence cannot conduct electricity.

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.24

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


 (a) Name two ores of iron. 
(b) Describe how the amount of iron in a sample of iron(III) oxide can be determined. 
ANSWERS
(a) Haematite;
 Magnetite;
 Siderite.
(b)  Weigh the iron (III) oxide together with a crucible;
 Heat the Iron(III) oxide and coke to a constant mass;
 Cool and re-weigh residue and crucible
 The difference in mass is weight of the iron.

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.23

25/11/2020

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KCSE Chemistry 2018 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 it is important to put off a non-luminous flame immediately after use.
ANSWERS
  • A non -luminous flame is invisible, hence it should be put off to avoid being accidentally burned.

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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.22

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


 You are provided with the following: thermometer, boiling tube, beaker, Bunsen burner, pure substance X whose boiling point is about 80°C, water and any other apparatus that may be required. Draw a labelled diagram of the set-up that can be used to determine the melting point of X. 
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.21

25/11/2020

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KCSE Chemistry 2018 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 set-up in Figure 6 and answer the questions that follow.
Picture
(a) Name the substance that was collected in tube p. 
(b) Write an equation for the reaction which occurs in tube Q in the first few minutes of the experiment. 
(c) Give a suitable Conclusion for the experiment in the set-up. 
ANSWERS
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K.C.S.E Chemistry Q & A-MODEL 2018.PP1.Q N.20

25/11/2020

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KCSE Chemistry 2018 Topical Questions and Answers

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


(a) Zinc reacts with hydrochloric acid according to the following equation.
Picture
​Identify the reducing agent. Give a reason for the answer. 
(b) Iron sheets are dipped in molten zinc to prevent rusting. Name  this process. 
ANSWERS
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