3. 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
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 ch... show full transcript
Worked Solution & Example Answer:3. 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 or fume hood to ensure adequate ventilation.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction between chlorine and hydrogen is:
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 in the acidic solution of hydrogen chloride, it turns red.
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 for a molecule of hydrogen chloride (HCl) shows hydrogen (H) with one outer shell electron and chlorine (Cl) with seven outer shell electrons. The diagram can be represented as follows:
H Cl
• ××××××
Here, the dot represents the electron from hydrogen and the crosses represent 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.
