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SUMMATIVE ASSESSMENT FIRST TERM STPM 2013
CHEMISTRY 962/1 One hour and a half hours
2 Section A [15 marks] Answer all questions in this section. 12
C atoms are isotopes of carbon. Which of the following is the same
for the isotopes? A B C D 2
Stability Nuclear charge Nucleon number Relative isotopic mass
100 120 140 160
Which of the following unknown organic compound will release a spectrum as the one shown above? A B C D 3
C4H8 C8H16 C10H20 C10H22
Vanadium has the electronic configuration of 1s22s22p63s23p63d34s2. Which ion does not exist? A
The energy-level diagram for a hydrogen atom shows several electronic transitions with frequencies f1, f2, f3, f4 and f5.
Energy n=∞ n=4 n=3 f4
Which of the following statements is / are true of the above diagram? I II III IV A B C D 5
I and II I and IV II and III III and IV
Based on the band theory, the conductivity of metal is due to delocalized electrons in the conduction band. How many electrons are found in the conduction band of a 10.0 g magnesium metal strip? [Relative atomic mass of Mg is 24.0; Avogadro constant is 6.02 x 1023 mol-1] A
f1 represents the convergence limit of the Lyman series. f1, f2 and f3 represent lines in the Lyman series. f4 and f5 are used to calculate the difference between the energy levels of n = 3 and n = 4. The electronic transition of f3 gives a line spectrum that corresponds to the region of visible light.
2.51 x 1023
5.02 x 1023
C 2.51 x 1024
Which of the following has van der Waals forces? A B C D
Which species is drawn with the correct shape? O [ I — I — I ]-
The diagram above shows the body-centred cubic structure of a unit cell. How many atoms are there in the unit cell above? A 9
The Boltzmann distribution curves at temperature T1 and T2 are shown below.
Fraction of molecules T2 T1 Energy
Ea At temperature T1, I II III IV
the activation energy is lower. more molecules have lower energy. the total number of molecules remain constant. the maximum point of the curve is displaced to the right.
I and II
I and IV
II and III
III and IV
A phase diagram of water is shown below. C
Pressure / Pa
Temperature / K
273.16 What can you deduced from the phase diagram? A B C D 11
An increase in pressure will decrease the freezing point of water. An increase in pressure will decrease the boiling point of water. Ice sublimes at a pressure higher than 611 Pa. Water exists as liquid at a pressure of 611 Pa and temperature of 298K.
The kinetic data for the reaction A + 2B → C at a certain temperature is shown in the following table. Experiment 1 2 3
Initial cencentration [A]o [B]o a b 2a b a 2b
Initial rate of reaction r 4r r
What is the rate of the reaction? A 12
A 2.0 dm3 stoppered flask at T oC contains 0.50 mol of SO2, 0.010 mol of O2 and 4.6 mol of SO3 at equilibrium. Calculate Kc for the following equilibrium at T oC. 2SO2 (g) + O2 (g) A B C D
5.9 x 10-5 dm3 mol-1 9.2 x 102 dm3 mol-1 8.5 x 103 dm3 mol-1 1.7 x 104 dm3 mol-1
Which underlined molecule reacts as a Lewis base? A B C D
The solubility product, Ksp of magnesium hydroxide in pure water at 25 oC is 2.0 x 10-11 mol3 dm-9. What is the solubility of magnesium hydroxide when an excess of solid magnesium hydroxide is shaken in 1 dm3 of 0.1 mol dm-3 sodium hydroxide? A B C D