Chemistry 9701/21 — October/November 2019
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Chemical Bonding · Hydrocarbons · Chemical Energetics · Analytical Techniques · Electrochemistry · Group 17 · +7 more
Chlorine can be prepared using the following reaction.
Explain why is described as an oxidising agent in this reaction.
Refer to oxidation numbers in your answer.
State what you would observe during this reaction.
The halogens chlorine, bromine and iodine are all volatile elements.
State and explain the trend in volatility down Group 17.
Chlorine undergoes disproportionation during many chemical reactions.
Write an equation for the reaction of chlorine with cold aqueous sodium hydroxide, .
Explain why it is a disproportionation reaction.
equation
explanation
One of the products of the reaction of chlorine with hot aqueous sodium hydroxide differs from those in (c)(i).
Identify the compound that is formed in this reaction that is different from that formed in the reaction in (c)(i).
State and explain the use of chlorine in water purification.
Under certain conditions, chlorine undergoes a free-radical substitution reaction with ethane.
State the conditions required to initiate this reaction.
Write the overall equation for this free-radical substitution reaction.
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