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Water, acidified with sulfuric acid, is decomposed by electrolysis - Edexcel - GCSE Chemistry - Question 3 - 2019 - Paper 1
Question 3
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 - Question 3 - 2019 - Paper 1
Step 1
A sample of hydrogen is mixed with air and ignited. State what would happen.
Answer
When a sample of hydrogen is mixed with air and ignited, an explosion occurs due to the rapid reaction of hydrogen with oxygen in the air. The result is a release of energy and the formation of water vapor. This can be described as a "pop" sound associated with the combustion process.
Step 2
Describe, using the data in Figure 2, what the results show about the volumes of hydrogen and of oxygen produced in this experiment.
Answer
The data in Figure 2 indicates that the volume of hydrogen produced increases by 2 cm³ for every 1 cm³ of oxygen produced. This ratio of hydrogen to oxygen is 2:1, reflecting the stoichiometric relationship in the electrolysis of water and subsequent reaction of hydrogen with oxygen. Moreover, as the reaction progresses, the volumes measured at each two-minute interval demonstrate a consistent increase in both gases, suggesting that hydrogen and oxygen are produced at constant rates throughout the experiment.