When copper reacts with sulphur, the product is
copper sulphate copper sulphide copper sulphite sulphur copperate
The pH value of a strong alkali could be
1 4 7 13
When an acid reacts with limestone, one of the products is
carbon dioxide hydrogen nitrogen oxygen
When an acid reacts with an alkali, one of the products is
an element a filtrate a salt a sublimate
Copper foil, hydrogen gas, liquid nitrogen and solid zinc are
all compounds all elements all mixtures some elements and some compounds
When sulphur reacts with air to give sulphur dioxide, the reaction can be described as
combustion condensation decomposition neutralisation