Kinetic Particle Model of Matter - IGCSE

138°C = ............K

• 411
• -411

• -135

• 135

106K = ..........°C

• -167
• -176

• 379

• -379

A sample of gas is sealed inside a container of fixed volume. The temperature of the gas is decreased. Which statement explains why the pressure of the gas decreases?

• The gas particles move more slowly and collide with the container walls less frequently and with less force.

• The gas particles move more slowly and collide with the container walls less frequently and with less force.

• The gas particles become smaller and occupy less space, reducing pressure.

• The gas condenses into a liquid and no longer exerts pressure on the container walls.

Which of the graphs below best shows the relationship between pressure and temperature?

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• 
• 
• 

Random motion or movement of particles caused by collisions between particles is called

• Quantum leap

• Brownian motion

• Centrifugal motion

• Newtonian motion

If the boiling point of dihydrogen monoxide (H₂O) on Mars is 273 K, what is its boiling point on Earth?

• 373°C

• 100 K

• 100°C

• 273 K

What is the term for the change of state from liquid to solid?

• Melting
• Evaporation
• Condensation
• Freezing

58°C = .......... K

Which statement correctly describes a gas?

• The particles are close together and can slide past each other.

• The particles are closely packed and vibrate in fixed positions.

• The particles are far apart and move quickly.

• The particles are not in contact and have high density.

What is the term for the change of state from liquid to solid?

• Melting
• Evaporation
• Condensation
• Freezing