Year 8 - Science
Energy provided by food: practical
Diet and exercise
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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 the components of a healthy diet, energy requirements, and the effects of imbalances, exercise, asthma, and smoking on the body. It also focuses on planning scientific enquiries, applying mathematical concepts, performing calculations, and basic data analysis techniques.
Lesson Summary
You will learn to calculate the amount of energy provided by different foods by measuring a change in temperature.
Key Notes
- Different foods provide different amounts of energy.
- The amount of energy provided by different foods can be investigated and compared by burning them.
- Burning foods can heat water and the temperature change of the water measured.
- The mean temperature change can be calculated from repeat measurements.
- Energy provided by the food (J) = mass of water (g) × rise in temperature (°C) × 4.2.
Vocabulary To Learn
- temperature change: The difference in the starting and end temperature of a substance.
- mean: An average of several measurements, which is calculated by adding them up and dividing by the number of measurements.
- mass: The amount of matter in an object.
- variable: A variable is anything that can change or be changed in an investigation.
Common Mistakes To Avoid
- Control variables make it a fair test.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Different foods provide different amounts of energy. The amount of energy provided by different foods can be investigated and compared by burning them.
2. Define this scientific word and use it in context. 'temperature change'
The difference in the starting and end temperature of a substance. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Control variables make it a fair test. Correction: Control variables need to be kept the same to make the investigation valid.
More Lessons In This Unit
- Balanced diet Study Guide
- Food is a source of building materials and energy Study Guide
- Good and ill health Study Guide
- Imbalanced diet: obesity Study Guide
- Imbalanced diet: starvation and deficiency diseases Study Guide
- Recovery time after exercise Study Guide
- The effects of exercise on breathing and heart rate Study Guide
- The effects of exercise on the human body Study Guide
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