When lighting a Bunsen burner, the air-hole should be
An example of an alkali is
lemon juice limewater salt water vinegar
A method used to get pure water from sea water is called
condensation distillation evaporation filtration
When a piece of marble or limestone is heated strongly, the gas given off is
carbon dioxide hydrogen oxygen sulphur dioxide
A gas which causes acid rain is
hydrogen methane nitrogen sulphur dioxide
The pH of vinegar is about
3 7 10 13
An example of a metal is
carbon iodine sulphur zinc
The most reactive metal in the list below is
calcium gold iron mercury
An example of a compound is
air graphite hydrogen water
The commonest gas in air is
carbon dioxide hydrogen nitrogen oxygen