Atoms, elements and compounds - Simple molecules and covalent bonds (3)

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1.

Consider the following molecules: methane (CH4), carbon dioxide (CO2), and water (H2O). Explain, in terms of structure and bonding, why water has a significantly higher boiling point than methane and carbon dioxide.

2.

State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations. Explain why this sharing of electrons results in greater stability for the atoms involved.

3.

Explain, in terms of structure and bonding, why simple molecular compounds generally have low melting and boiling points. Your answer should consider the nature of the forces between the molecules.