Year 9 - Science
Chemical reactions: acid and metal carbonate
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 when a metal carbonate reacts with an acid and write chemical equations to describe these reactions.
Key Notes
- A group of one carbon atom and three oxygen atoms bonded together is called a carbonate group.
- Metal carbonate + acid → salt + water + carbon dioxide
- The test for carbon dioxide gas is to bubble it through limewater as it turns the solution cloudy (milky).
- Rain water is usually a little acidic and when it is more acidic than normal it is called acid rain.
- Acid rain reacts with marble to produce a salt, water and carbon dioxide, using up some of the marble.
Vocabulary To Learn
- chemical weathering: when rocks are broken down by a chemical change, for example reactions with acid rain
- limewater: a colourless solution which is used to test for carbon dioxide. It turns cloudy/milky white when carbon dioxide is bubbled through it
- chemical test: when a chemical reaction is carried out to determine the presence of a substance
- acid rain: rainwater that is more acidic than usual due to air pollution, usually caused by sulfur dioxide and nitrogen oxides
Common Mistakes To Avoid
- Pupils think that acids 'eat away' materials and disappear. They observe reactions and see the loss of a reactant, but do not recognise the formation of a new soluble product.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
A group of one carbon atom and three oxygen atoms bonded together is called a carbonate group. Metal carbonate + acid → salt + water + carbon dioxide.
2. Define this scientific word and use it in context. 'chemical weathering'
when rocks are broken down by a chemical change, for example reactions with acid rain. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils think that acids 'eat away' materials and disappear. They observe reactions and see the loss of a reactant, but do not recognise the formation of a new soluble product. Correction: Ensure that pupils understand the concept of solubility and use the words soluble and dissolve when describing the production of metal salts during these reactions.
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