Year 9 - Science
Chemical reactions: neutralisation
Acids and bases
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers acids, alkalis, and their neutralisation reactions, the pH scale, and the reactions of acids with metals and alkalis. It also examines the chemical properties of metal and non-metal oxides. Emphasis is on evaluating risks, using appropriate techniques, and making observations.
Lesson Summary
You will learn to describe what happens during a neutralisation reaction and write word and symbol equations to represent different neutralisation reactions.
Key Notes
- Neutralisation reaction general equation is: base + acid → metal salt + water.
- Sodium hydroxide has the formula NaOH(aq) and hydrochloric acid has the formula HCl(aq).
- In a neutralisation reaction, the metal salt formed is named after the metal (from the base) and acid used.
- Common bases include metal oxides and hydroxides.
- (s), (l), (g) and (aq) in chemical equations identify the state of each substance as solid, liquid, gas or in solution.
Vocabulary To Learn
- neutralisation: When a chemical reaction takes place between an acid and base to produce a neutral solution of a metal salt and water.
- metal salt: A compound formed when an acid reacts with a base.
- aqueous solution (aq): Formed when a substance is dissolved in water.
Common Mistakes To Avoid
- Pupils often do not understand what neutralisation is i.e. exactly the correct quantities of components from the acid and base combined to form water.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Neutralisation reaction general equation is: base + acid → metal salt + water. Sodium hydroxide has the formula NaOH(aq) and hydrochloric acid has the formula HCl(aq).
2. Define this scientific word and use it in context. 'neutralisation'
When a chemical reaction takes place between an acid and base to produce a neutral solution of a metal salt and water. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often do not understand what neutralisation is i.e. exactly the correct quantities of components from the acid and base combined to form water. Correction: It is worth emphasising that water is formed and it is this which is neutral as it contains the hydrogen and oxygen atoms from the acid and base.
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