1Write any four physical properties and any four uses of nitrogen gas.
2Describe, with a labelled diagram, how nitrogen is prepared in the laboratory.
3Why is the mixture dissolved in water before it is heated when preparing nitrogen?
4How can you confirm that the gas in a jar is nitrogen?
5Why is a burning splinter going out not enough to show a gas is nitrogen?
6Why is nitrogen collected by the water displacement method?
7Write the conditions and the balanced equation for making ammonia from nitrogen and hydrogen.
8Why are food packets and electric bulbs filled with nitrogen?
9What happens when burning calcium is placed in nitrogen? Write the equation.