Water, acidified with sulfuric acid, is decomposed by electrolysis. The water is decomposed to produce hydrogen and oxygen. (i) A sample of hydrogen is mixed with air and ignited. State what would happen. (ii) Throughout the experiment the volume of hydrogen and the volume of oxygen are measured at two-minute intervals. The results are shown in Figure 2. Figure 2 time in minutes volume of hydrogen in cm³ volume of oxygen in cm³ 0 0 0 2 4 2 4 8 4 6 12 6 8 16 8 10 18 8

GCSE Edexcel Chemistry Combined Science Rates of reaction: Water, acidified with sulfuric a

Water, acidified with sulfuric acid, is decomposed by electrolysis - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Question 2

Water, acidified with sulfuric acid, is decomposed by electrolysis. The water is decomposed to produce hydrogen and oxygen. (i) A sample of hydrogen is mixed with a... show full transcript

Worked Solution & Example Answer:Water, acidified with sulfuric acid, is decomposed by electrolysis - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Step 1

State what would happen.

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Answer

When a sample of hydrogen mixed with air is ignited, it will react explosively. The hydrogen will combust, resulting in the formation of water and releasing energy in the form of heat and light.

Step 2

Describe, using the data in Figure 2, what the results show about the volumes of hydrogen and oxygen produced in this experiment.

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Answer

The data in Figure 2 indicates that the volume of hydrogen produced is always twice that of the volume of oxygen produced at each time interval. For example:

After 2 minutes, 4 cm³ of hydrogen was produced along with 2 cm³ of oxygen.
After 4 minutes, 8 cm³ of hydrogen was produced, and 4 cm³ of oxygen followed the same pattern. This consistent 2:1 ratio confirms that for every volume of oxygen produced, there are two volumes of hydrogen, demonstrating the stoichiometric relationship in the reaction between water and its components during electrolysis.

Water, acidified with sulfuric acid, is decomposed by electrolysis - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Worked Solution & Example Answer:Water, acidified with sulfuric acid, is decomposed by electrolysis - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

State what would happen.

Describe, using the data in Figure 2, what the results show about the volumes of hydrogen and oxygen produced in this experiment.

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