a) Water, acidified with a small amount of dilute sulfuric acid, can be decomposed by electrolysis using the apparatus shown - Edexcel - GCSE Chemistry - Question 4 - 2015 - Paper 1
Question 4
a) Water, acidified with a small amount of dilute sulfuric acid, can be decomposed by electrolysis using the apparatus shown.
(i) State the form of energy used to c... show full transcript
Worked Solution & Example Answer:a) Water, acidified with a small amount of dilute sulfuric acid, can be decomposed by electrolysis using the apparatus shown - Edexcel - GCSE Chemistry - Question 4 - 2015 - Paper 1
Step 1
i) State the form of energy used to carry out the electrolysis.
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Answer
The form of energy used to carry out the electrolysis is electrical energy. This can also be referred to as electric current.
Step 2
ii) Describe a test to show that this gas is hydrogen.
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Answer
To test for hydrogen gas, you can use a lighted splint. When a lighted splint is brought to the mouth of the test tube containing the gas, it will produce a 'squeaky pop' sound. This indicates the presence of hydrogen.
Step 3
b) Name a raw material that can be electrolysed to produce chlorine.
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Answer
A raw material that can be electrolysed to produce chlorine is sodium chloride solution, commonly known as brine.
