Chlorine is an element in group 7 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2023 - Paper 2
Question 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 transi... show full transcript
Worked Solution & Example Answer: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.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction between chlorine and 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 bonded together. These atoms can be of the same element, as in the case of chlorine (Cl₂), or different elements, forming compounds. Molecules are the smallest units of a chemical 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 metallic sodium, the metal atoms release some of their electrons, creating a sea of delocalized electrons that can move freely throughout the metal. This movement of electrons allows electric current to flow when a voltage is applied.
Step 5
Use this information to state the formula of sodium chloride.
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Answer
The formula of sodium chloride is NaCl, indicating that it is composed of one sodium ion (Na⁺) and one chloride ion (Cl⁻).
