Deduce the percentage of carbon dioxide in this biogas sample.
Complete the chemical equation for this reaction: $\text{CO}_2 + \ldots \text{H}_2 \rightarrow \text{CH}_4 + \ldots \text{H}_2\text{O}$
Methane and ethane belong to the same homologous series. What does the term homologous series mean?
Draw a dot-and-cross diagram to show the electron arrangement in a molecule of methane, $\text{CH}_4$. Show only outer shell electrons.
Helium and hydrogen can both be used to fill balloons. Suggest one advantage of using helium rather than hydrogen to fill balloons.
On the structure shown, draw a circle around a functional group that reacts with aqueous bromine.
How many different kinds of atoms are in compound C?
Describe how ethanol can be separated from the rest of the fermentation mixture by fractional distillation. In your answer describe how to carry out the fractional distillation and explain how ethanol is separated from the rest of the fermentation mixture using fractional distillation.