MYP Physics 2.1 States and Properties of Matter, Kinetic Theory Questionbank

In the observation of Brownian motion, how does the size of the visible particles (such as smoke or pollen) generally compare to the size of the molecules (such as air or water) causing the motion?

True or False: Brownian motion occurs because visible particles like pollen have their own internal energy source that makes them move randomly.

When you touch a cold object, you feel a sensation of 'coldness'. According to kinetic theory, what is occurring at the particle level during this interaction?

If the temperature of a fluid is increased during a Brownian motion experiment, what change would be observed in the movement of the visible smoke particles?

In the kinetic theory of gases, the motion of particles is described as 'random'. What does this imply about the individual particles?

The visible particles are much smaller than the invisible molecules

The visible particles are much larger than the invisible molecules

Visible particles only move when hit by particles larger than themselves

Both particles are exactly the same size

True

False

Cold particles from the object travel into your skin

Fast-moving particles in your skin collide with slower object particles, transferring energy away from your skin

The particles in your skin stop moving entirely upon contact

The particles in the object expand and push against your skin

The particles would begin to move in perfectly straight lines

The random jittering would stop completely

The movement would become more rapid and violent

The particles would move more slowly due to increased fluid density

They follow a predictable, repeating circular path

They all move at exactly the same speed in the same direction

They move in all directions with a range of different speeds

They only move when the container itself is moved