Question detail
A product uses 2000 kJ across its life cycle. Disposal uses 25% of this energy. Which option gives the disposal-stage energy use?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Life cycle assessment and recycling
Question
- A. 400 kJ
- B. 500 kJ
- C. 600 kJ
- D. 700 kJ
Answer
The correct option is 500 kJ. 25% of 2000 kJ is 0.25 ? 2000 = 500 kJ. 400, 600 and 700 kJ do not match the stated percentage, so they would misread the LCA disposal-stage data.
Explanation
The correct option is 500 kJ. 25% of 2000 kJ is 0.25 ? 2000 = 500 kJ. 400, 600 and 700 kJ do not match the stated percentage, so they would misread the LCA disposal-stage data. This keeps the answer anchored to AQA GCSE Chemistry Unit 4.10 Using resources and avoids confusing neighbouring resource, material, water-treatment, LCA, Haber process or fertiliser ideas.
Common mistake
Misunderstanding Decimal Use
Students often confuse the use of decimals with whole numbers when interpreting LCA data, leading to incorrect calculations.
Practice converting whole numbers to decimals and ensure to use appropriate decimal places based on the context of the data.
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