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 includes elements like fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), which are known for forming salts when they react with metals.
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:
Chlorine gas + Sodium → Sodium chloride
Step 3
Describe what is meant by the term molecule.
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Answer
A molecule is defined as two or more atoms that are chemically bonded together. Molecules can consist of the same type of atoms, as in diatomic gases like Cl₂, or different types of atoms, as in compounds like H₂O. Molecules are the smallest fundamental units of a chemical compound that can take part in a chemical reaction.
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, including sodium, the outer electrons can move freely, allowing electrical current to flow through the metal when a potential difference is applied. This property of having delocalized electrons is what enables sodium to conduct electricity efficiently.
Step 5
Use this information to state the formula of sodium chloride.
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Answer
The formula for sodium chloride is NaCl. This is derived from the fact that sodium (Na) forms a positive ion (Na⁺) and chlorine (Cl) forms a negative ion (Cl⁻) when they react to form the ionic compound sodium chloride.
