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CHEMISTRY SSS 1
1.
(a)(i)
Distinguish between dative bond and covalent bond.
(ii)
Explain why sugar and common salt do not conduct electricity in the solid state
(iii)
State the type of intermolecular forces present in (a) hydrogen fluoride (b) argon
(iv)
Consider the compounds with the following structures: S – H ---- N and O – H ---- N
In which of the compounds is the hydrogen bond stronger? Give reason for your answer
2.
3.
Name the type of bond present in each of the following compounds.
(i)
carbon (IV) oxide
(ii)
calcium oxide
(iii)
methane
(iv)
ammonium chloride
(a)# Elements X and Y are represented as
40
X and
16
Y respectively.
(i) For each element write:
I.
the electronic configuration in using the s, p, d and f notation;
II.
the number of unpaired electrons present in the atom;
III.
the orbital in which the valence electrons are found;
IV.
the group and the period to which that the element belongs
(ii) State the type of bond that would be formed between X and Y. Explain your answer.
(b)# Chlorine can be represented as 35Cl and 35Cl.
(i) What name is given to these two types of chlorine atoms.
(ii) Explain why the two atoms are chemically alike.
(iii) Name another element that exhibits the same property.
CHEMISTRY SSS 2
1.(i) State TWO uses of electrolysis.
(ii) 5.6dm3 of oxygen gas was evolved at the anode during electrolysis of dilute copper (II)
tetraoxosulphate (VI) using platinum electrodes. What mass of copper is deposited at the cathode during
the process? [ Cu=64, Molar volume of gas at s.t.p = 22.4dm3, 1F = 96500C]
2.(a) Define the following terms;
(i) conductors
(ii) electrolytes
(b) (i) Outline an experiment to distinguish between an electrolyte and a non-electrolyte
(ii) Give ONE difference between strong and weak electrolytes.
(c) 1.20g of silver was deposited when 1.60 amperes of current were passed through silver trioxonitrate
(V) and copper (II) chloride solutions connected in series calculate the;
(i) mass of copper deposited during electrolysis.
(ii) time taken for the deposition of silver metal.
(d) (i) State TWO general properties of acids.
(ii)
3.
Name the organic acid found in: I. Sour milk
II. Lemon juice III. Vegetable/animal oils
Consider the following reaction equation: PCl3(g) + Cl2(g) ⇌
(i)
PCl5; ∆H = - 92.5 kJmol-1
State
I. two factors that affect both the rate of reaction and the equilibrium position;
II. one factor that affects only the rate of reaction but not the equilibrium position. Give a reason for
your answer.
(ii) Explain what would be the effect on the equilibrium concentration of Cl2(g) if;
added.
I. the total pressure is increased;
II. The temperature is increased
III. more PCl3(g) is