particles move freely because they are held by very weak forces

diamond and graphite

Viscosity is a property of liquids and gases.

stronger attractive forces --> higher viscosity

Which is the most viscous liquid?

Warming honey makes it more runny.

Why do water droplets have a round shape?

All gases are vapors.

intermolecular forces are negligible and gas molecules occupy a negligible volume

A real gas is a gas that behaves almost like an ideal gas in ordinary temperatures and pressures.

results from the particles colliding with the walls of their container

According to Boyle's Law, pressure and volume are inversely proportional.

If temperature increases, the volume also increases.

Bread rises in an oven.

$$O_2$$  

Living cells are composed of organic compounds.

water ( $$H_2O$$  )