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2.1 Kinetic particle model of matter

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Question 16
a.

There are three common states of matter: solid, liquid, and gas.

Match each state of matter to the correct description of its particle arrangement and motion:

  • Solid
  • Liquid
  • Gas

Descriptions:

  • Arrangement X: Particles are widely spaced and free to move randomly at high speeds.
  • Arrangement Y: Particles are closely packed in a regular, ordered lattice and vibrate about fixed positions.
  • Arrangement Z: Particles are close together but randomly arranged, and can slide/move past one another.
[3]
b.

A student spills a small amount of rubbing alcohol (ethanol) onto the back of their hand.

The student notices that their skin feels cold as the ethanol evaporates. Explain, in terms of particles and energy, why the evaporating ethanol produces a cooling effect on the skin.

[3]
c.

A glass vial containing a small amount of liquid ethanol is sealed tightly with a rubber bung. The vial is left on a sunny windowsill on a hot afternoon. After some time, the rubber bung pops out of the vial.

Suggest, in terms of particles, why the rubber bung pops out.

[3]
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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