Year 10 - Science
Energy changes: displacement practical
Energy changes in reactions
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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 bulk material properties related to bonding and intermolecular forces and explores bond breaking, bond making, activation energy, and reaction profiles. It focuses on selecting appropriate techniques, translating data, and presenting observations using various models.
Lesson Summary
You will learn to complete a practical to measure the temperature change in a displacement reaction, record results, analyse data, and write a conclusion.
Key Notes
- Displacement reactions involve a more reactive element replacing another in a compound.
- Exothermic reactions release energy to the surroundings, often through heating.
- The initial and final temperatures of the reaction mixture need to be recorded to calculate energy change.
- Hypotheses guide predictions about the effect of variables in experiments.
- Bar charts can visually represent collected results to help analyse data.
Vocabulary To Learn
- displacement: The more reactive element takes the place of a less reactive element in a compound.
- exothermic: Exothermic chemical reaction is a type of reaction in which energy is transferred from the reaction to the surroundings e.g. combustion.
- hypothesis: A prediction that is supported with an explanation.
- conclusion: Sums up what has been found out during the investigation. It always refers to both the independent and dependent variables.
- bar chart: A chart showing solid columns; to present data usually used when one variable is discrete.
Common Mistakes To Avoid
- Pupils often measure the final temperature of the reaction mixture rather than the highest temperature.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Displacement reactions involve a more reactive element replacing another in a compound. Exothermic reactions release energy to the surroundings, often through heating.
2. Define this scientific word and use it in context. 'displacement'
The more reactive element takes the place of a less reactive element in a compound. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often measure the final temperature of the reaction mixture rather than the highest temperature. Correction: Encourage pupils to keep monitoring the temperature until it starts to decrease; that way they will know they have seen the highest temperature.
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