Year 10 - Science
Energy changes: neutralisation 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 perform a practical to measure the temperature change in a neutralisation reaction, record results, analyse data, and conclude if the reaction is exothermic or endothermic.
Key Notes
- Neutralisation reactions involve an acid reacting with a base to form salt and water.
- Exothermic reactions release energy to the surroundings, often through heating.
- Methods must be detailed and replicable for reliable data collection.
- The initial and final temperatures of the reaction mixture need to be recorded to calculate energy change.
- Line graphs can illustrate relationships between continuous variables in experiments.
Vocabulary To Learn
- neutralisation: Neutralisation is when a chemical reaction takes place between an acid and base to produce a neutral solution of a salt and water.
- exothermic: An exothermic reaction is a type of reaction in which energy is transferred from the reactants to the surroundings e.g. combustion.
- method: A method describes how an experiment is carried out; it is a step-by-step procedure.
- line graph: A line graph involves two continuous variables being plotted to show if a relationship exists between them. Any trends in the data are shown with the addition of a line of best fit.
- conclusion: A conclusion sums up what has been found out during an investigation. It always refers to both the independent and dependent variables.
Common Mistakes To Avoid
- Pupils can assume that any decrease in temperature occurring when excess reactant is added to an exothermic reaction is because the reaction has become endothermic.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Neutralisation reactions involve an acid reacting with a base to form salt and water. Exothermic reactions release energy to the surroundings, often through heating.
2. Define this scientific word and use it in context. 'neutralisation'
Neutralisation is when a chemical reaction takes place between an acid and base to produce a neutral solution of a salt and water. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils can assume that any decrease in temperature occurring when excess reactant is added to an exothermic reaction is because the reaction has become endothermic. Correction: Explain that once the limiting reactant has been used up the exothermic reaction is complete. The addition of excess reactant will only act to cool down the reaction mixture.
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