SHC 6 M

Question 1

Answer 1

The bubbles get bigger
• Molecules of gas in constant motion
• Molecules widely spaced and moving randomly
• Molecules impact on surface of bubble/liquid molecules
• Average of impacts produces gas pressure
• Pressure is due to rate at which gas particles collide with liquid molecules/bubble surface
• Liquid pressure decreases as bubble rises
• P1V1 = P2V2
• If pressure decreases, volume of bubble will increase/volume of bubble must increase to give a decrease in pressure
• As volume increases, rate at which particles collide with surface of bubble decreases
(6)

Question 2

Answer 2

Question 3

Explain, with the aid of a circuit diagram, the method a student could use to investigate how the resistance of a single lamp changes with the potential difference across the lamp.

Answer 3