One way to extract metals from land contaminated with metal compounds is phytoextraction - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2019 - Paper 1
Question 3
One way to extract metals from land contaminated with metal compounds is phytoextraction.
When plants grow they absorb metal ions through their roots.
The plants are... show full transcript
Worked Solution & Example Answer:One way to extract metals from land contaminated with metal compounds is phytoextraction - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2019 - Paper 1
Step 1
(i) Calculate the percentage by mass of nickel compounds in the ash.
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Answer
To calculate the percentage by mass of nickel compounds in the ash, you can use the formula:
extPercentagebymass=(mass of ashmass of nickel compounds)×100
Given that the mass of nickel compounds is 142.0 g and the mass of the ash is 1000 g (1 kg), substituting these values into the formula gives:
extPercentagebymass=(1000142.0)×100=14.2%.
Therefore, the percentage by mass of nickel compounds in the ash is 14.2%.
Step 2
(ii) State an advantage of extracting nickel by phytoextraction rather than from its ore.
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An advantage of extracting nickel by phytoextraction is that it is an environmentally friendly process. Phytoextraction uses plants to absorb nickel from contaminated soil, which reduces the need for mining activities that can harm the environment. Furthermore, this method can help rehabilitate contaminated land and is often more cost-effective compared to traditional extraction methods.
Step 3
(b)(i) Write the balanced equation for this reaction.
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The balanced equation for the reaction of nickel sulfide (NiS) when heated in air to form nickel oxide (NiO) and sulfur dioxide (SO2) is:
