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 table?
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Answer
Group 7 of the periodic table is known as the halogens. The halogens include elements such as fluorine, chlorine, bromine, iodine, and astatine.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction between chlorine and sodium is:
Chlorine + Sodium → 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. These atoms can be of the same element, like in the case of chlorine gas (Cl₂), or different elements, forming compounds. Molecules are the smallest units of a substance that retain its chemical properties.
Step 4
Explain how sodium conducts electricity.
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Answer
Sodium conducts electricity due to the presence of free-moving electrons. In metals like sodium, the outer electrons are not tightly bound to individual atoms and can move freely throughout the structure. When an electric field is applied, these electrons flow towards the positive terminal, allowing electric current 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 is NaCl, which represents the ratio of sodium ions (Na⁺) to chloride ions (Cl⁻) in the compound.
