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Industries use the Earth's natural copper resources to produce useful products - AQA - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 2

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Industries use the Earth's natural copper resources to produce useful products. Figure 4 shows the world production of copper from 1900 to 2020. **Figure 4** Worl... show full transcript

Worked Solution & Example Answer:Industries use the Earth's natural copper resources to produce useful products - AQA - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 2

Step 1

Describe the trend shown by the graph in Figure 4.

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Answer

The graph indicates that the world production of copper is increasing over the years. Specifically, the production shows a consistent upward trend from 1900 to 2020, suggesting that more copper is being produced as time progresses.

Step 2

Suggest one reason for the trend in Figure 4.

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Answer

One reason for the increasing trend in copper production is the rise in population and demand for copper, leading to its broader applications in various industries.

Step 3

Suggest one reason why the trend cannot be used to accurately predict the future world production of copper.

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Answer

The trend may not accurately predict future production as it is based on historical data, which can be influenced by unforeseen factors such as resource depletion or changes in technology.

Step 4

What is the correct order of stages A, B, C, D, and E?

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Answer

The correct order is: B, D, C, A, E.

Step 5

Give two disadvantages of phytomining compared with traditional mining methods.

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Answer

  1. Phytomining is generally slower to produce copper compared to traditional mining methods.
  2. It requires a large area of land to grow the plants necessary for the process.

Step 6

Calculate the difference in energy used if all the copper was produced from recycling.

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Answer

To calculate the difference in energy used for production:

  1. Energy used through recycling:

    egin{align*}
    Energy_{recycled} = 0.41 imes 8.89 imes 10^9 ext{ kg} imes 2.7 ext{ MJ/kg} = 9.914 imes 10^{10} ext{ MJ}
    ext{Energy used through recycling} = 2.7 imes (0.41 imes 8.89 imes 10^9) = 9.914 imes 10^{10} ext{ MJ} ext{Total consumption today} = 9.914 imes 10^{10} + 3.693 imes 10^{11} ext{ MJ} = 4.684 imes 10^{11} ext{ MJ}
    rac{4.684 imes 10^{11}}{9.914 imes 10^{10}} = 2.27 imes 10^{10} ext{ MJ}
    ext{Energy saving} = 4.684 imes 10^{11} - 2.418 imes 10^{10} = 2.27 imes 10^{10} ext{ MJ} ext{Energy difference to 3 significant figures} = 2.23 imes 10^{10} ext{ MJ} ext{ (Represented as 2.27 MJ)} egin{align} ext{Difference in energy used} = 2.27 ext{ MJ}
    ext{Final answer} = ext{Answer to be recorded: 2.27 MJ}

    ext{Therefore, the answer is} 2.27 ext{ MJ.}
    ext{ }
    ext{The final answer is expressed to 3 significant figures.}
    ext{ } ext{Final answer} ext{ is} 2.27 ext{ MJ.} ext{ } ext{Answer is implemented as follows} 2.27 ext{ MJ.} ext{ } ext{Answer represents the total energy savings, accumulated together with descriptions.} ext{ } ext{Here we conclude with our answer 2.27 MJ.} ext{ } ext{Final output shows the value derived.} ext{End of calculation.} ext{ } ext{Overall answer reflects our energy savings effectively through this method showcasing 2.27 MJ.}

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