Resources

Question 1

State factors that affect the contribution of a greenhouse gas to global warming?

Answer 1

The atmospheric concentration of the gas, it’s ability to absorb infrared radiation and it’s residence time.

Question 2

What are the methods of CCS (carbon capture storage)?

Answer 2

Storage as carbonates. Stored in the oceans in oil wells. Storage in geological formations.

Question 3

Suggest ways in using a catalyst makes a process more sustainable?

Answer 3

It means that less energy would be needed, therefore less CO2 will be emitted into the atmosphere. The catalyst is not used up in the reaction. Catalysts can generate specific products meaning that process will have a higher atom economy.

Question 4

Why is there still concerns about ozone depletion?

Answer 4

As CFC’s have long residence in the atmosphere and CFC’s are still being used.

Question 5

Suggest why the petroleum industry processes hexane into cyclohexane?

Answer 5

It burns more efficiently.

Question 6

Suggest, with the aid of an equation, how NO is formed within an aeroplane engine?

Answer 6

N2 + O2 —-> 2NO

Question 7

Ozone in the stratosphere is broken down to make O2 and O.

Describe and explain how the concentration of ozone in the stratosphere is maintained?

Answer 7

O + O2 —-> O3

The rate of formation is the same as the rate of decomposition.

Question 8

State le Chatelier’s principle?

Answer 8

The position of equilibrium will shift so as to minimise the effect of any change in conditions.

Question 9

When C12H26 is cracked, a variety of alkanes and alkenes are formed with different chain lengths.
Explain why a variety of alkanes and alkenes are formed with different chain lengths?

Answer 9

As carbon-carbon bonds can break anywhere.