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2.1 Kinetic particle model of matter

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Question 49
a.

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

  1. .........................................................................................................................................

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

[2]
b.

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.

............................................................................................................................................

............................................................................................................................................

[2]
c.

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\text{volume}volume = ............................................................

[3]
d.

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.

............................................................................................................................................

[1]
Markscheme

2.1 Kinetic particle model of matter Questions

  1. IGCSE
  2. /Physics
  3. /2.1 Kinetic particle model of matter

321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.

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