A gas syringe contains air at 25\ ^\circ\text{C}. The plunger is pushed in from 60 \ \text{cm}^3 to 40 \ \text{cm}^3. Which statement best explains, in terms of particles, why the pressure of the gas increases?

Particles become larger and hit the walls harder.

Particles move slower and stay near the walls.

Particles are closer together and collide with the walls more often.

Particles change into liquid and stick to the walls.

SC-382

Particle model of matter

Lower Sec Science · Secondary 1 · Hard · Particle model of matter

A gas syringe contains air at

25\ ^\circ\text{C}

. The plunger is pushed in from

60 \ \text{cm}^3

40 \ \text{cm}^3

. Which statement best explains, in terms of particles, why the pressure of the gas increases?

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