GCSE CHEMISTRY CHEMICAL CHANGES EXAM REVISION
QUESTIONS WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
Oxidation - ANSWER- Loss of electrons
Reduction - ANSWER- Gain of electrons
Displacement reaction - ANSWER- When a more reactive element takes the place of a less
reactive element in a compound
Redox reaction - ANSWER- A reaction where both oxidation and reduction occur
Acid - ANSWER- Substance that produces hydrogen ions (H⁺) in water
Alkali - ANSWER- Substance that produces hydroxide ions (OH⁻) in water
Strong acid - ANSWER- An acid which is fully ionised (split into ions) in water
Weak acid - ANSWER- An acid in which only a few molecules are ionised
Dilute - ANSWER- A solution containing a small amount of dissolved solute
Concentrated - ANSWER- A solution containing a lot of dissolved solute
Neutralisation - ANSWER- Reaction between an acid and an alkali forming water.
QUESTIONS WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
Oxidation - ANSWER- Loss of electrons
Reduction - ANSWER- Gain of electrons
Displacement reaction - ANSWER- When a more reactive element takes the place of a less
reactive element in a compound
Redox reaction - ANSWER- A reaction where both oxidation and reduction occur
Acid - ANSWER- Substance that produces hydrogen ions (H⁺) in water
Alkali - ANSWER- Substance that produces hydroxide ions (OH⁻) in water
Strong acid - ANSWER- An acid which is fully ionised (split into ions) in water
Weak acid - ANSWER- An acid in which only a few molecules are ionised
Dilute - ANSWER- A solution containing a small amount of dissolved solute
Concentrated - ANSWER- A solution containing a lot of dissolved solute
Neutralisation - ANSWER- Reaction between an acid and an alkali forming water.
