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AQA GCSE · Question 07.6 · Cell Biology
The student calculated the percentage change in mass of each potato piece.
For one potato piece:
• the starting mass was 2.5 g
• the end mass was 2.7 g.
Calculate the percentage increase in mass of the potato piece.
Use the equation:
percentage increase in mass = (increase in mass / starting mass) × 100
The student calculated the percentage change in mass of each potato piece.
For one potato piece:
• the starting mass was 2.5 g
• the end mass was 2.7 g.
Calculate the percentage increase in mass of the potato piece.
Use the equation:
percentage increase in mass = (increase in mass / starting mass) × 100
How to approach this question
1. First, calculate the "increase in mass". Subtract the starting mass from the end mass.
2. Substitute the "increase in mass" and the "starting mass" into the given equation.
3. Divide the increase in mass by the starting mass.
4. Multiply the result by 100 to get the percentage.
Full Answer
**Step 1: Calculate the increase in mass.**
The formula requires the "increase in mass".
Increase in mass = End mass - Starting mass
Increase in mass = 2.7 g - 2.5 g = 0.2 g
**Step 2: Use the given equation to find the percentage increase.**
Percentage increase = (increase in mass / starting mass) × 100
Percentage increase = (0.2 / 2.5) × 100
**Step 3: Complete the calculation.**
0.2 ÷ 2.5 = 0.08
0.08 × 100 = 8
The percentage increase in mass is 8%.
Common mistakes
✗ Dividing by the end mass instead of the starting mass.\n✗ Forgetting to multiply by 100.\n✗ Making a calculation error when subtracting or dividing.
Practice the full AQA GCSE Biology Foundation Tier Paper 1
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