Figure 9 shows the percentage of three gases, X, Y and Z, in the Earth's early atmosphere - Edexcel - GCSE Chemistry - Question 5 - 2023 - Paper 2
Question 5
Figure 9 shows the percentage of three gases, X, Y and Z, in the Earth's early atmosphere.
percentage of gas in Earth's early atmosphere
percentage of gas in Earth... show full transcript
Worked Solution & Example Answer:Figure 9 shows the percentage of three gases, X, Y and Z, in the Earth's early atmosphere - Edexcel - GCSE Chemistry - Question 5 - 2023 - Paper 2
Step 1
What is the name of gas Z?
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Answer
Gas Z is carbon dioxide. It is believed to be the gas with the highest percentage in the Earth's early atmosphere.
Step 2
State what piece of equipment the student could use to measure the pH of each liquid.
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Answer
The student could use a pH meter or pH indicator strips to accurately measure the pH of each liquid.
Step 3
Explain one improvement that the student could make to the method to make the results more valid.
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One improvement would be to ensure that the same volume of water and acid is used each time. This reduces variability in the experiment and helps to isolate the effect of pH on plant survival.
