A student compresses gas in a sealed syringe and observes an increase in pressure. The student concludes that the gas must have become hotter. Which evaluation is correct?
The conclusion is justified; reducing volume can increase collision rate only by increasing mean speed.
The conclusion is not justified; reducing volume always decreases collision rate while increasing mean speed.
The conclusion is justified; reducing volume always increases particle number while leaving mean speed unchanged.
The conclusion is not justified; reducing volume can increase collision rate without increasing mean speed.
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.