A sealed rigid metal canister contains a constant volume of gas.
When the canister is placed in a freezer, the gas cools down and its pressure decreases.
Which row in the table correctly explains this decrease in pressure in terms of the behavior of the gas molecules?
| Number of gas molecules in canister | Average force of each collision with the wall | Number of collisions per second with the wall | |
|---|---|---|---|
| A | decreased | decreased | increased |
| B | unchanged | unchanged | decreased |
| C | unchanged | decreased | decreased |
| D | unchanged | decreased | increased |
Row A
Row B
Row C
Row D
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.