Starter quiz
- Which element is more reactive, magnesium or copper?
- Both are equally reactive
- Copper
- Magnesium ✓
- Neither is reactive
-
- Which type of data is best represented by a bar chart?
- Continuous data
- Discrete data ✓
- Variable data
- Textual data
-
- What is a hypothesis in an experiment?
- A conclusion drawn from results
- An observation made during the experiment
- A prediction with an explanation ✓
- A proven theory
-
- What is an independent variable in an experiment?
- The variable that is changed ✓
- The variable that is measured
- The variable that stays constant
- The variable that is dependent on other factors
-
- What is a dependent variable in an experiment?
- The variable that is changed
- The variable that is measured ✓
- The variable that stays constant
- The variable that affects the results
-
- Why is it important to control variables in an experiment?
- To ensure the results are reliable and valid ✓
- To increase the number of variables
- To make the experiment faster
- To introduce random factors
-
Exit quiz
- What occurs during a displacement reaction?
- A more reactive element replaces a less reactive one ✓
- A less reactive element replaces a more reactive one
- No reaction occurs
- The reaction involves no change in the elements
-
- What do exothermic reactions release?
- 'energy' ✓
- What does an exothermic reaction typically result in?
- Decrease in temperature
- Increase in temperature ✓
- No temperature change
- Decrease in pressure
-
- How do you calculate the energy change in a reaction?
- Subtract initial mass from final mass
- Subtract initial temperature from final temperature ✓
- Subtract initial volume from final volume
- Subtract mass from volume
-
- Which substance would be displaced if zinc is added to copper sulfate solution?
- Copper ✓
- Sulfur
- Zinc
- No reaction would occur
-
- What is the correct symbol equation for the displacement reaction of zinc with copper sulfate?
- Zn + CuSO₄ → ZnCu + SO₄
- Zn + CuSO₄ → ZnCuSO₄
- Zn + CuSO₄ → ZnSO₄ + Cu ✓
-
Worksheet
Presentation
Video
Lesson Details
Key learning points
- 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.
Common misconception
Pupils often measure the final temperature of the reaction mixture rather than the highest temperature.
Encourage pupils to keep monitoring the temperature until it starts to decrease; that way they will know they have seen the highest temperature.
Keywords
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.