Figure 8 shows one molecule of each of four different substances, A, B, C and D - Edexcel - GCSE Chemistry - Question 6 - 2018 - Paper 1
Question 6
Figure 8 shows one molecule of each of four different substances, A, B, C and D.
(a) State the formula of a molecule of substance B.
(b) (i) Substance C can be for... show full transcript
Worked Solution & Example Answer:Figure 8 shows one molecule of each of four different substances, A, B, C and D - Edexcel - GCSE Chemistry - Question 6 - 2018 - Paper 1
Step 1
State the formula of a molecule of substance B.
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Answer
The formula of substance B is SO₂.
Step 2
Substance C can be formed by burning an element in oxygen.
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Answer
The word equation for this reaction is:
hydrogen + oxygen → water.
Step 3
Consider substances A, B, and D.
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Answer
The two substances that can be formed by burning an element in oxygen are B and D.
Step 4
Explain what has caused this change.
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Answer
The amount of oxygen in the atmosphere has increased due to the process of photosynthesis, where plants release oxygen as a byproduct of converting carbon dioxide and sunlight into energy.
