What is the chemical reaction in which a substance break up on heating to form two or more simpler substances, which can be either elements or compounds?

The reaction between hydrogen and chlorine to form

The heating of an electric iron is

Which is the chemical reaction in which a more reactive element displaces a less reactive element from its compound?

Respiration of living beings is

Of these which one can neither be created nor be destroyed?

A reddish brown metal is

The new substance which obtained by any chemical reaction is known as

For a balanced equation the sign can be replaced by the = sign is

Iron and sulphur have combined to form a compound called