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CHEMISTRY
WORK SET
FORM 2

SEPTEMBER, 2022

1
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State the type of bonds broken on melting each of the following substances:
(i) MgF2(s)

(ii) CO2(s)

(iii) SiO2(s)

(iv) Fe(s)

b
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MgCl2, NaCl, AlCl3
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(ii) Briefly explain why HCl is not 100% covalent
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A solid substance, X, melts easily when heated
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Predict the following for X
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Electrical conductivity
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(i) What is hydrogen bonding?
(ii) State two unique properties of hydrogen atom that account for the strong interactive force
between water molecules
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(iv) Rationalize the differences in the boiling points of the following pair of substances:
(i) HF (20OC) and H2O (100OC)
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2
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Consider the reaction: HCl (g) + NaNO2 (s) → NO2 (l) + NaCl (s)

b
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2NaCl (s) + H2O (l) → 2HCl ( g) + Na2O(s)
507kJ
NO (g) + NO2 (g) +Na2O (s) → 2NaNO2(s)
-427kJ
NO (g) + NO2 (g) → N2O (g) + O2 (g)
-43kJ
2HNO2 (l) → N2O (g) + O2 (g) + H2O (l)
34kJ

1

c
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Explain how ΔH remains unchanged when a catalyst is added to the reaction
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d
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e
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(i) State Dalton’s law of partial pressure
(ii) What refinement had to be made in Dalton’s atomic theory to account for Gay Lussac’s
results on combining volume?
(iii) Distinguish between vapor and gas
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0g of Calcium trioxocarbonate (IV)
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Two identical balloons labeled A and B are respectively filled with equal amount of
hydrogen gas at 250C and 0oC under constant pressure
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A hypothetical gas Q deviates significantly from ideal behavior
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(ii) Under what conditions can gas Q assume ideal behavior? Give reasons for your answer
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d
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Give reasons for
your answer
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Describe how to prepare one of the gases named in d(i)

2

4
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A group of students performed an experiment involving a reaction between zinc and
hydrochloric acid to investigate one of the factors that affects reaction rate
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5g of zinc granules to excess hydrochloric acid and measured the mass of zinc
used per unit time
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(i) Give the balanced equation for the reaction taking place
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(iii) Give a reason why the students must use the same amount of zinc granules in both
experiments
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(vi) State two advantages of using a catalyst instead of high temperature in chemical reactions
b
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Why?
c
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(ii) Explain any two general conditions that can give rise to zero-order rates
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(α) By what factor does the rate increases when the concentration of both reactants are doubled
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035M/S, [ A] =2M and [B]=3M
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The following table shows the electronegativities of elements A, B and C
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4
B
3
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6
i
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polar covalent bond
ii
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(γ) non – polar covalent bond

NOTE: ALL ANSWERS SHOULD BE TYPED AND PRINTED
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3



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