Calculate a value for the bond energy of the C-F bond, using suitable bond energies from the Data Booklet and the equation below. $\text{CH}_2=\text{CH}_2\text{(g)} + \text{HF(g)} \rightarrow \text{CH}_3\text{CH}_2\text{F(g)} \qquad \Delta H^{\circ} = -73\,\text{kJ mol}^{-1}$
Another halogenoalkane used both as a refrigerant and as an aerosol propellant is dichlorodifluoromethane, $\text{CCl}_2\text{F}_2$. State two reasons why compounds such as $\text{CH}_3\text{CH}_2\text{F}$ and $\text{CCl}_2\text{F}_2$ have been chosen for use as aerosol propellants and refrigerants.
Using relevant Data Booklet information and your response to (a), suggest why $\text{CCl}_2\text{F}_2$ is responsible for damage to the ozone layer in the stratosphere, whereas $\text{CH}_3\text{CH}_2\text{F}$ is not.
What does the term enhanced greenhouse effect refer to?
Water vapour is the most abundant greenhouse gas. Which greenhouse gas is second in abundance?
A greenhouse gas found in very small quantities in the atmosphere is sulfur hexafluoride, $\text{SF}_6$, which is used in high voltage electrical switchgear. What is the shape of the $\text{SF}_6$ molecule?