1What is the atmosphere? Which gases make it up, and in what proportions?
2What are isotopes? Write the isotopes of hydrogen.
3Why is hydrogen called the 'water producer'?
4How is hydrogen gas prepared in the laboratory? Describe it with a chemical equation.
5Why is impure zinc used instead of pure zinc, and dilute acid instead of concentrated acid, when preparing hydrogen?
6The end of the thistle funnel must be under the acid, but the end of the delivery tube must not be. Why?
7How is hydrogen gas tested?
8Why can hydrogen be collected over water, and why is its jar kept upside down?
9Write any four physical properties of hydrogen.
10What is a reduction reaction? Give one example with an equation.
11Write any four uses of hydrogen gas.