Question

Which factor has the greatest effect on the melting point of a crystalline solid

Answer 1

Inter-molecular forces. The greater the attraction between particles the more energy required to break the forces or "melt" them.

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Answer 2

The answer is: the type of bonding among the particles.

For example, calcium oxide (CaO) has ionic bonds between calcium cations (Ca²⁺) and oxygen anions (O²⁻).

Because it has strong ionic bonds, it has high melting point (around 2600°C).

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

Amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point