Electrolysis occurs when solutions of some compounds are decomposed by passing direct electric current through them - Edexcel - GCSE Chemistry - Question 5 - 2012 - Paper 1
Question 5
Electrolysis occurs when solutions of some compounds are decomposed by passing direct electric current through them.
(a) Sodium chloride solution was electrolysed. ... show full transcript
Worked Solution & Example Answer:Electrolysis occurs when solutions of some compounds are decomposed by passing direct electric current through them - Edexcel - GCSE Chemistry - Question 5 - 2012 - Paper 1
Step 1
State a hazard associated with chlorine gas.
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Answer
Chlorine gas is toxic and can be harmful to health when inhaled.
Step 2
Describe a test that can be used to identify a sample of gas as chlorine.
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Answer
One method to identify chlorine gas is to use damp blue litmus paper. The litmus paper will turn red and then white, indicating the presence of chlorine due to the bleaching effect.
Step 3
State a use of chlorine.
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Answer
Chlorine is commonly used in water purification to eliminate harmful microorganisms.
Step 4
Complete and balance the equation for the overall reaction taking place when sodium chloride solution is electrolysed.
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