State two ways in which the molecular structure of a gas differs from the molecular structure of a liquid.

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2. .........................................................................................................................................

Compressibility is the ease with which a substance can be compressed.

State and explain, in terms of the forces between the molecules, how the compressibility of a gas differs from that of a liquid.

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Nitrogen gas stored in a cylinder is used to inflate an emergency life raft.

The nitrogen that fills the raft has a volume of 0.015 m³ at a pressure of 1.8 × 10⁷ Pa inside the cylinder.

The pressure of the nitrogen in the fully inflated raft is 1.5 × 10⁵ Pa and its temperature remains constant.

Calculate the volume occupied by the nitrogen in the raft.

$volume$ = ............................................................

If the raft is deployed in extremely cold water, the temperature of the nitrogen gas decreases.

State the effect of this temperature change on the nitrogen molecules.

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