1)Some strips of the metals, iron, Fe, zinc, Zn, and silver, Ag, were placed in separate beakers, each containing 1.0 M nickel(II) sulfate, NiSO₄, solution in water at 25 °C. What is expected to occur over time?
A. Ni will be deposited in all of the beakers.
B. Ni will not be deposited in any of the beakers.
C. A reaction will occur only in the beaker containing Ag.
D. A reaction will occur only in the beakers containing Fe and Zn.

Solution

2)An aqueous solution of ethanol, CH₃CH₂OH, left exposed to the air, will undergo a redox reaction with oxygen, O₂, to form ethanoic acid, CH₃CH₂OH. The half-equation for the oxidation reaction is

Solution

Solution

4) Soda water is made by dissolving pressurised carbon dioxide, CO₂, in water. A bottle of soda water was placed on an electronic balance. The cap was removed and placed next to the bottle on the electronic balance. The graph below shows the change in mass as the CO₂ escapes. The experiment was conducted at standard laboratory conditions (SLC)

Assuming CO₂ was the only gas given off, the volume of CO₂ that was released is closest to
A. 14 L
B. 25 L
C. 36 L
D. 44 L

Solution

5) A certain fuel contains 91% octane, C₈H₁₈, by mass with the remainder being ethanol, C₂H₅OH. When 2.50 kg of this fuel is completely burnt at 25 °C and 100 kPa, the amount of energy produced, in megajoules, would be
A. 78
B. 114
C. 116
D. 121

Solution