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 H₂O, which represents water.
Step 2
Substance C can be formed by burning an element in oxygen.
Write the word equation for this reaction.
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Answer
The word equation for the formation of substance C is:
hydrogen + oxygen → water.
Step 3
Consider substances A, B, and D.
Give the letters of the two substances that can be formed by burning an element in oxygen.
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Answer
The two substances that can be formed by burning an element in oxygen are substances B and D.
Step 4
Explain what has caused this change.
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Answer
The increase in the amount of oxygen in the atmosphere is primarily due to the process of photosynthesis. Through photosynthesis, plants convert carbon dioxide and water into glucose and oxygen, significantly contributing to the levels of oxygen in the atmosphere over time.
