Question

chemistry 20
final exam 2025
name: ebteisam
gases

1. a balloon is filled with hot air and then sealed. afterwards, the balloon is placed in a cold room. the resulting temperature change would cause the balloon to

____ , and the pressure in the balloon would ____ .
the statement above is best completed by information in row

Explanation:

Step1: Apply Charles's Law

Charles's Law states that \(V\propto T\) (at constant pressure). When the balloon is placed in a cold room, \(T\) (temperature) decreases. Since \(V\) is proportional to \(T\), the volume \(V\) (so the balloon) will contract.

Step2: Apply Gay - Lussac's Law

Gay - Lussac's Law states that \(P\propto T\) (at constant volume). But here, the volume is not constant. However, we can also think in terms of the behavior of gas molecules. When the temperature decreases, the average kinetic energy of gas molecules decreases. The molecules hit the walls of the balloon less frequently and with less force. So the pressure inside the balloon decreases.

Answer:

contract, decrease