A rigid, sealed glass bottle containing air is placed inside a freezer. After several hours, the temperature of the air inside the bottle has decreased.
Which row in the table states what has happened to the average speed of the air molecules and the pressure of the air inside the bottle?
| Average speed of molecules | Pressure of the air | |
|---|---|---|
| A | decreases | decreases |
| B | decreases | increases |
| C | increases | decreases |
| D | increases | increases |
Average speed decreases; pressure decreases
Average speed decreases; pressure increases
Average speed increases; pressure decreases
Average speed increases; pressure increases
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.