Simple molecular structures
3 marks · EasyDescribe the structure and properties of a substance with a simple molecular structure.
State the type of bonds within a simple molecule.
Describe the forces between the molecules.
Explain why these substances have low melting and boiling points.
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(a) Covalent bonds. · must show covalent bonds
(b) Weak intermolecular forces. · must show weak intermolecular forces
(c) These substances have low melting and boiling points because little energy is needed to overcome the weak intermolecular forces between the molecules. · must show linking weak forces to low energy required
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Marking points
B1 (a) · 1 mark · States that the bonds within the molecule are covalent.
B1 (b) · 1 mark · Describes the forces between molecules as weak intermolecular forces.
B1 (c) · 1 mark · Explains low melting/boiling points due to weak forces between molecules needing little energy to break.
Worked solution
a) The bonds within a simple molecule are covalent bonds.
b) The forces between molecules are weak intermolecular forces.
c) Substances with simple molecular structures have low melting and boiling points because the weak intermolecular forces require little energy to break.