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
- ... 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. This group contains elements like 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 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 bonded together. These atoms can be the same or different. For example, a chlorine molecule (Cl₂) consists of two chlorine atoms that are chemically bonded.
Step 4
Explain how sodium conducts electricity.
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Answer
Sodium conducts electricity due to the presence of free-moving electrons. When sodium is in its metallic state, these electrons can move freely through the metal, allowing electric current to pass. This free movement of electrons is a characteristic feature of all metals that enables them to conduct electricity efficiently.
Step 5
Use this information to state the formula of sodium chloride.
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Answer
The formula of sodium chloride is NaCl. This indicates that each sodium ion (Na⁺) pairs with one chloride ion (Cl⁻) to form the compound.
