Simple Molecular Substances and Intermolecular Forces Flashcards

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What is a simple molecular substance?

A simple molecular substance is made of small molecules with covalent bonds between the atoms.

Strong covalent bonds hold the atoms together in one molecule.

Weak intermolecular forces act between different molecules.

They have low melting and boiling points because only weak intermolecular forces must be overcome.

Many simple molecular substances are gases or liquids at room temperature, and some are low-melting solids.

When one melts or boils, the molecules stay whole but the weak forces between them break.

No. They do not conduct electricity because they have no free electrons or ions to carry charge.

Larger molecules have stronger intermolecular forces, so they have higher boiling points.

Intermolecular means 'between molecules' and describes the weak forces between separate molecules.

Oxygen (O2), water (H2O) and carbon dioxide (CO2) are examples of simple molecular substances.