9. Fluorine, chlorine, bromine, iodine and astatine are elements in group 7 - Edexcel - GCSE Chemistry - Question 9 - 2019 - Paper 1
Question 9
9. Fluorine, chlorine, bromine, iodine and astatine are elements in group 7.
a) Describe the test to show that a gas is chlorine.
b) Bromine reacts with hydrogen t... show full transcript
Worked Solution & Example Answer:9. Fluorine, chlorine, bromine, iodine and astatine are elements in group 7 - Edexcel - GCSE Chemistry - Question 9 - 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, damp litmus paper can be used. When chlorine gas is bubbled through this paper, it first bleaches the paper white. Continued exposure will result in the paper turning red due to the acidic nature of the gas.
Step 2
State the name of the solution formed.
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Answer
The solution formed from hydrogen bromide dissolved in water is called hydrobromic acid.
Step 3
Predict the colour and state of astatine at room temperature.
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Answer
The predicted colour of astatine is dark gray or black, and its state is solid at room temperature.
