A pH or acid-base indicator is a compound that changes color depending ... property of a substance and that a color change can also be used as evidence that a chemical reaction has occurred. Students ...

Red cabbage contains a chemical called anthocyanin. This pigment is a natural acid-base indicator. It is blue in neutral substances, like plain water. When an acid like lemon juice gets in the water, ...

Learn what pH means and how it is measured in this KS3 chemistry guide from BBC Bitesize. Neutralisation reactions Acids ... the name of the acid and metal. Acids and bases Acids, bases and ...

Types of chemical reactions - OCR Gateway Oxidation is the gain of oxygen and reduction is the loss of oxygen. Neutralisation is the reaction between an acid and a base. Acids react with metals ...