WAEC Chemistry 2022 Paper

Concept:When temperature is constant, a gas follows Boyle's law: $P V = \text{constant}$.Explanation:Compressing the syringe decreases the volume of the trapped air.Since temperature does not change, the process is isothermal.For an isothermal process, $P_1 V_1 = P_2 V_2$.As volume $V$ decreases, pressure $P$ must increase so that the product $P V$ stays constant.This occurs because the air molecules collide with the syringe walls more frequently.Answer:B. pressure increases