Calculate the
relative atomic mass of an element whose isotopic masses and relative
abundances are given below. (3 marks)
 |
Relative Abundance Isotopic Mass
31 65
69 63
2. The pH values of solutions A, B, C, D are
given below
A – 9.8
B - 2.0
C - 5.2
D - 12.0
State the possible solution that
corresponds to
(i) Hydrochloric
acid
(ii) Ethanoic
acid
(iii) Sodium
Hydroxide
3. Calculate the volume of CO2.
Which would be produced by heating 80g of Copper (II) Carbonate at room temperature. Cu = 63.5, C = 12, O = 16
Molar gas volume at R.T.P. = 24.0dm3 (3 marks)
4. Element M displaces P from a
solution containing ions of P. The heated oxide of M is reduced by hydrogen but
the heated oxide of P is not reduced. O liberates hydrogen from cold water.
(a) Give
the decreasing of reactivity of the elements. (2 marks)
(b) Write
down a general chemical equation for the reaction between M and P. (1
mark)
5. A student decided to separate powdered Calcium Carbonate from
powdered Calcium Chloride by shaking
the mixture, with water and then filtering. Explain whether this procedure
would succeed. (3 marks)
6. Elements A and B have atomic numbers 12
and 6 respectively.
(a) Write
the electron arrangement for each of them. (4 marks)
A
B
(b) What
is the state of B at room temperature? Explain (2 marks)
7. Why is water not used to put off oil
fires? (2 marks)
8.
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