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Hydrogen reacts with chlorine to form hydrogen chloride - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Question 4
Hydrogen reacts with chlorine to form hydrogen chloride. The symbol – is used to show a covalent bond. The electronic configuration of hydrogen is 1. The electroni... show full transcript
Worked Solution & Example Answer:Hydrogen reacts with chlorine to form hydrogen chloride - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Step 1
Step 2
Draw the dot-and-cross diagram for the molecule of hydrogen chloride.
Answer
To draw the dot-and-cross diagram:
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Represent the hydrogen atom (H) with one electron as a dot: •
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Represent the chlorine atom (Cl) with seven outer electrons, using dots for its own electrons and crosses for the electron contributed from hydrogen:
H: • Cl: ••••••✗
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Indicate the shared pair by connecting them with a line:
H: • – Cl: ••••••✗
This diagram represents hydrogen chloride (HCl) with the shared pair of electrons shown as a line.