10. Sulfuric acid acts as a dehydrating agent. What does this mean?
A. It removes water from a
substance
B. It removes oxygen from a
Substanco
C. It removes carbon dioxide from a
substance
D. It removes chlorine from a
substance
11. Which of the following methods is NOT suitable way to measure the rate of a
chemical reaction?
A. Measuring the mass of a reaction mixture
B. Measuring the volume of gas given off
C. Measuring the light transmitted through a solution
D. Measuring the volume of liquid at the start of the reaction
12. In order to accelerate the rate of a chemical reaction, there are two things
which we can do. Pick the correct combination.
A. Decrease the chances of particle collision
Increase the energy the particles collide with
B. Increase the chances of particle collision
Increase the energy the particles collide with
C. Increase the chances of particle collision
Decrease the energy the particles collide with
D. Decrease the chances of particle collision
Decrease the energy the particles collide with
13. If 80 cm³ of gas was given off in a reaction in 20 seconds, what was the
average rate of reaction?
A. 4 cm/s
B. 1,600 cm³/s
C. 0.25 cm³/s
14.A solution of copper(II) sulphate is electrolysed using copper electrodes. How
much copper will be
deposited by a current of 2 ampere
flowing for 20-
minutes?
A. 0.8 grams
15. Look at this reaction.
CO+3H2 (s)
B. 0.4 grams
CH4 (9)+H2O(g) AH-206kJ mol
C. 0.5 grams
What would be the best conditions for increasing the yield of methane?
A. Low temperature; low pressure
B. Low temperature;
high pressure
C. high temperature;
high pressure
D. None
BUL