State the proportion of nitrogen present in clean, dry air.
State where the hydrogen for the Haber process comes from.
Complete the dot-and-cross diagram in Fig. 3.1 for a molecule of ammonia. Show only the electrons in the outer shell.
Write the chemical equation for the reaction in the Haber process, then give the usual reaction conditions. Include units where they are needed.
Suggest which element below is most likely to act as the catalyst. Circle your choice. calcium, lead, platinum, sodium, sulfur
State the oxidation number of nitrogen in $\text{NH}_3$. State the oxidation number of nitrogen in NO.
Use your answer to (ii) to explain whether the nitrogen in ammonia is oxidised or reduced.
Complete Table 3.1 with the words increases, decreases or no change.
A lower temperature makes the rate of the forward reaction fall. Explain, using collision theory, why the reaction rate is slower at the lower temperature.
Balance the symbol equation for this reaction. $\ldots\ldots\text{NO} + \ldots\ldots\text{O}_2 + \ldots\ldots\text{H}_2\text{O} \rightarrow \ldots\ldots\text{HNO}_3$