State the sources and effects of the following gases:
Water vapour

State the sources and effects of the following gases: Methane

State the sources and effects of the following gases: Carbon dioxide

State the main sources and effects of carbon monoxide

State the three effects of heat on matter.

State some sources of hydrogen.

What are the main sources of water?

Select the chemical changes from the following list of changes - Vaporisation of water into water vapour

State one safety precaution for each of the following: in handling a radioactive source,

Write true or false for the following statements: A vapour is a gaseous state of a liquid below its boiling point.

State one observation for the following : Bromine vapours are passed into a solution of ethyne in carbon tetrachloride.