Page 364 - SUBSEC October 2017_Neat

- 5 -

Item 17 refers to the data in the table,
Item 15 refers to the diagram below obtained for the reaction between
which shows a Born-Haber Cycle for molecules X and Y at 500 K. The
NaCl. stoichiometric equation for the reaction is

2X (g) + Y (g) → X Y (g)
2
2
2

Experiment Initial concentration/ Inital rate/
Number mol dm -3 mol dm s
-3 -1
X Y
1 0.01 0.02 2.4 x 10 -6
2 0.02 0.02 4.8 x 10 -6
3 0.01 0.01 1.2 x 10 -6

17. The correct orders of reaction with respect
to X and Y are

X Y
(A) 0 2
(B) 2 0

(C) 1 0
(D) 1 1

Item 18 refers to the following data for
the reaction between propanone, iodine
15. What is the lattice energy of sodium and hydrogen ions.
chloride?
CH COCH + H + I → ICH COCH + 2H + I
+
+
(A) -727 kJ mol -1 3 3 2 2 3 2
(B) -95 kJ mol -1 Expt. Concentration/mol dm -3 Rate/ mol
(C) +663 kJ mol -1 no CH COCH H + I dm s
-3 -1
(D) +727 kJ mol 3 3 2
-1
1 0.1 0.1 0.1 0.04
2 0.2 0.1 0.1 0.08
16. The general form of a rate equation is 3 0.1 0.2 0.1 0.08
given by: Rate = k [A] [B] b 4 0.1 0.2 0.2 0.08
a

The rate constant, k, is defined as the The rate of reaction is given by
rate of reaction when the concentration Rate = k[CH COCH ] [H ] [I ] z
x
+ y
of each reactant (in mol dm ) is 3 3 2
-3
18. The values of x, y and z are
(A) 0
(B) 1/2 (A) x = 1, y = 1, z = 1
(C) 1 (B) x = 0, y = 1, z = 1
(D) 2 (C) x = 1, y = 1, z = 0

(D) x = 0, y = 0, z = 1

GO ON TO THE NEXT PAGE
02112010/CAPE/SPEC/2017