6. (a) Describe the test to show that a gas is chlorine - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 1
Question 6
6. (a) Describe the test to show that a gas is chlorine.
(b) Bromine reacts with hydrogen to form hydrogen bromide.
Hydrogen bromide dissolves in water to form a... show full transcript
Worked Solution & Example Answer:6. (a) Describe the test to show that a gas is chlorine - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 1
Step 1
Describe the test to show that a gas is chlorine.
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Answer
To test for chlorine gas, you can use a piece of damp litmus paper. Chlorine gas will bleach the litmus paper, turning it white, indicating the presence of chlorine.
Step 2
State the name of the solution formed.
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Answer
The name of the solution formed is hydrobromic acid.
Step 3
Predict the colour and state of astatine at room temperature.
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Answer
At room temperature, astatine is predicted to be a grey-black solid.
Step 4
Explain the observations shown in the table.
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Answer
The initial colours of the aqueous solutions indicate the specific halogen present. When mixed, bromine and chlorine are both effective in producing a brown solution due to the formation of bromine's brown colour dominating. Iodine remains brown since its colour does not change significantly in a mixture as it interacts with the other halogens, which leads to no visible colour change.
Step 5
Write the balanced equation for this reaction.
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Answer
The balanced equation for the reaction of fluorine with iron is:
