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 chlori... 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
One safety precaution is to use a fume cupboard or fume hood to ensure proper ventilation and prevent inhalation of chlorine gas.
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
The litmus paper turns red/pink.
Step 4
Complete the dot and cross diagram of a molecule of hydrogen chloride. Show outer shell electrons only.
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Answer
In the diagram, represent the hydrogen atom (H) with one electron and the chlorine atom (Cl) with seven electrons. The diagram should show that they share a pair of electrons.
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.
