Science revision

Acid - A compound that has a pH value lower than 7

Alkali - A compund that has a pH value higher than 7

Compound - A substance consisting of two or more substances chemically combined together.

Ion - A particle that has a positive or negative electrical charge.

Atom - The smallest part of an element which can enter into chemical reactions.

Neutralisation - A reaction between an acid and a base which forms a…