Y10 CH CHAPTER1 CHECK

Match the following.

• freezing

• solid → liquid

• boiling

• liquid → solid

• melting

• liquid → gas

• condensation

• gas → liquid

• sublimation

• solid → gas

Which intersection represents fluidity?

• A

• B

• C

• D

Which intersection represents a fixed volume?

• A

• B

• C

• D

Put the states in order of increasing attraction between particles.

• Gas

• Liquid

• Solid

The figure is a heating curve for a pure substance. What is the melting point of the substance? Enter the value only, without units.

What happens to temperature during a state change?

• The temperature increases during a state change.
• The temperature remains constant during a state change.
• The temperature decreases during a state change.
• The temperature fluctuates during a state change.

What happens to the particles at 17 °C?

• The particles vibrate more strongly while staying in fixed positions.

• The particles gain kinetic energy and become completely free of all intermolecular forces.

• The particles lose energy and become fixed in position in a regular arrangement.

• The particles gain kinetic energy and move faster, overcoming some intermolecular forces.

The substance receives a constant amount of energy over time. Which of the statements is true about the substance?

• The latent heat of fusions and the latent heat of vaporisation are the same.

• The latent heat of fusion is greater than the latent heat of vaporisation.

• The latent heat of vaporisation is less than the latent heat of fusion.

• The latent heat of vaporisation is greater than the latent heat of fusion.

The figure shows the cooling curve of a substance. What is the state of the substance at room temperature (20°C)?

• S

• L

• G

Which of the following statements explains why two solids do not mix when placed on top of each other?

• Solids have fixed volumes

• Solids are not fluids

• Particles of solids have too much kinetic energy

• Particles of solids cannot be compressed