Chlorine is an element in group 7 of the periodic table - Edexcel - GCSE Chemistry - Question 6 - 2023 - Paper 2
Question 6
Chlorine is an element in group 7 of the periodic table.
(a) What name is given to group 7 of the periodic?
(b) Chlorine reacts with sodium to form sodium chloride.... show full transcript
Worked Solution & Example Answer:Chlorine is an element in group 7 of the periodic table - Edexcel - GCSE Chemistry - Question 6 - 2023 - Paper 2
Step 1
What name is given to group 7 of the periodic?
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Answer
Group 7 of the periodic table is known as the halogens.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction of chlorine with sodium to form sodium chloride is:
Chlorine + Sodium → Sodium Chloride.
Step 3
Describe what is meant by the term molecule.
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Answer
A molecule is a group of two or more atoms bonded together. These can be of the same or different elements. In the case of chlorine (Cl₂), it consists of two chlorine atoms that are chemically bonded.
Step 4
Explain how sodium conducts electricity.
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Answer
Sodium conducts electricity because it has free-moving electrons which can carry an electric charge. In solid sodium, these electrons are not free to move, but when sodium is melted or dissolved in water, the electrons can flow, allowing electricity to pass through.
Step 5
Use this information to state the formula of sodium chloride.
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Answer
The formula for sodium chloride, which consists of sodium ions (Na⁺) and chloride ions (Cl⁻), is NaCl.
