4. Chlorine is an element in group 7 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2023 - Paper 2
Question 4
4. Chlorine is an element in group 7 of the periodic table.
(a) What name is given to group 7 of the periodic table?
A alkali metals
B halogens
C noble gases
D tra... show full transcript
Worked Solution & Example Answer:4. Chlorine is an element in group 7 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2023 - Paper 2
Step 1
What name is given to group 7 of the periodic table?
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Answer
Group 7 of the periodic table is known as the halogens. This group contains elements that are highly reactive nonmetals.
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:
Sodium + Chlorine → Sodium Chloride
Step 3
Describe what is meant by the term molecule.
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Answer
A molecule is defined as a group of two or more atoms that are chemically bonded together. In the case of chlorine (Cl₂), each molecule consists of two chlorine atoms bonded covalently.
Step 4
Explain how sodium conducts electricity.
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Answer
Sodium conducts electricity because it has free-moving electrons. When a voltage is applied, these electrons can move through the metal, allowing it to conduct electrical current.
Step 5
Use this information to state the formula of sodium chloride.
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Answer
The formula of sodium chloride is NaCl, which signifies that it is made up of one sodium ion (Na⁺) and one chloride ion (Cl⁻).
