Chlorine, bromine and iodine are elements in group 7 of the periodic table - Edexcel - GCSE Chemistry: Combined Science - Question 3 - 2020 - Paper 1
Question 3
Chlorine, bromine and iodine are elements in group 7 of the periodic table.
(a) Chlorine is toxic.
State one safety precaution that should be taken when using chlor... show full transcript
Worked Solution & Example Answer:Chlorine, bromine and iodine are elements in group 7 of the periodic table - Edexcel - GCSE Chemistry: Combined Science - Question 3 - 2020 - Paper 1
Step 1
State one safety precaution that should be taken when using chlorine in the laboratory.
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Answer
A safety precaution that should be taken when using chlorine is to use a fume cupboard to ensure adequate ventilation and prevent inhalation of toxic fumes.
Step 2
Write the word equation for this reaction.
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Answer
Hydrogen + Chlorine → Hydrogen Chloride
Step 3
State what is seen when blue litmus paper is placed into this solution.
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Answer
When blue litmus paper is placed into the solution, it turns red, indicating the presence of an acid.
Step 4
Complete the dot and cross diagram of a molecule of hydrogen chloride. Show outer shell electrons only.
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Answer
The dot and cross diagram of a molecule of hydrogen chloride (HCl) should depict a chlorine atom with 6 'x' electrons in its outer shell and a hydrogen atom with 1 '•' electron in its outer shell. The diagram would show:
H Cl
• x x x x x x
where '•' represents the electron from hydrogen and 'x' represents the electrons from chlorine.
Step 5
Name the type of bonding in a molecule of hydrogen chloride.
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Answer
The type of bonding in a molecule of hydrogen chloride is covalent bonding.
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