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Covalent bonding

Covalent bonding

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Question 12

Hydrogen chloride is formed in the reaction between hydrogen and chlorine. The equation for the reaction is:

H2+Cl2→2HCl \text{H}_2 + \text{Cl}_2 \rightarrow 2\text{HCl} H2​+Cl2​→2HCl
a.

Each molecule in this equation contains the same type of bonding. Name this type of chemical bonding.

[1]
b.

The covalent bonds inside a chlorine molecule are strong. Explain why the boiling point of chlorine is low.

[2]
c.

Explain how the two chlorine atoms in a chlorine molecule (Cl2\text{Cl}_2Cl2​) are held together.

[2]
d.

In a dot-and-cross diagram showing only the outer-shell electrons of a hydrogen chloride (HCl\text{HCl}HCl) molecule:

  1. State the number of shared electrons between the hydrogen and chlorine atoms.
  2. State the number of non-bonding (unshared) outer-shell electrons on the chlorine atom.
[2]
e.

Hydrogen chloride gas (HCl\text{HCl}HCl) dissolves in water to form solution A. Hydrogen chloride gas dissolves in methylbenzene to form solution B. A student adds a piece of magnesium ribbon to each solution. Explain why effervescence is observed with solution A but not with solution B.

[4]
Markscheme

Covalent bonding Questions

  1. IGCSE
  2. /Chemistry
  3. /Covalent bonding

15 exam-style questions on Edexcel IGCSE Chemistry Covalent bonding. Each one has a worked solution and a mark scheme showing where the marks go.

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