Sec 1 Science Particulate Nature of Matter topical questions

Describe the arrangement and movement of particles in a solid.

State the meaning of diffusion.

Name the change of state when a liquid becomes a gas throughout the liquid, and the change when a solid becomes a liquid.

A steel bridge has small gaps between sections. State why the gaps are there.

State what happens to the mass of a sealed metal bar when it is heated and expands.

Compare the arrangement and movement of particles in a liquid and in a gas.

A perfume bottle is opened at the front of a room. Explain why a student at the back smells it after a short time, and why the smell arrives sooner if the room is warmer.

A capped bottle of air is warmed. The bottle does not burst. Explain what happens to the particles, the volume of the air if it could expand, and the mass of the air.

Explain melting using the particle model. State whether a new substance is formed.

A student draws gas particles touching each other in neat rows. State two corrections.

An open beaker of water is boiled until half the water has gone. The mass of the beaker and water has decreased. A student says, “Boiling destroyed some mass, so the particle model is wrong.” Evaluate the claim.

Explain why diffusion of the same perfume is faster in air than in water, using the particle model.

A liquid has a mass of 120 g and a volume of 100 cm³. It is heated, expands to 110 cm³, and none of it escapes.

1. (a)State the mass after heating.[1]
2. (b)Calculate the density before heating and after heating.[2]
3. (c)State why the density changes, using the particles.[1]

Explain the difference between boiling and evaporation from the surface, using where the change happens.

Give one observation the particle model explains well, and one way the drawn model is limited.