States of Matter (particle theory, diffusion, gas pressure)

In steam, the distance between the molecules is __________ distance between the molecules in liquid water.

Please fill in the blank with the correct answer!

• smaller than

• the same as

• larger than

• not change

The following statements about the arrangement of particles:

1. The particles are arranged in regular rows

2. The particles are arranged randomly

3. The particles can only vibrate

4. The particles can move freely

Which statements describe the particles in gases?

• 1 and 4

• 2 and 3

• 1 and 3

• 2 and 4

Heating a liquid causes it to become a vapor. What happens to the molecules of the liquid during the process?

• molecules become bigger and move further apart

• molecules become bigger

• molecules move further apart

• nothing happens

The phase change is shown below:

In which changes do the particles move further apart?

• R and S

• R and U

• S and T

• T and U

An inflated balloon is placed in a refrigerator. Which statement describes the movement of the gas particles in the balloon?

• The particles move more slowly and become closer together.

• The particles move faster and become closer together.

• The particles move more slowly and become further apart.

• The particles move faster and become further apart.

Small crystals of purple KMnO₄ and orange K₂Cr₂O₇ were placed at the centers of separate Petri dishes filled with agar jelly. They were left to stand under the same physical conditions. After some time, the color of each substance had spread out as shown.

The lengths of the arrows indicate the relative distances traveled by particles of each substance. Which process causes this to happen?

• Brownian motion

• Condensation

• Diffusion

• Filtration

If you put some pollen grains into a drop of water on a microscope slide, they float. When you look through the microscope, you will see that the pollen grains are moving about. They jiggle about in random directions. You will see the same effect if you sprinkle some dust on the water. What is the process of the occasion above?

• Diffusion

• Brownian Motion

• Molecular Motion

• Collision Motion

When you make tea, particles from the tea leaves diffuse into the water. You can make the tea stronger and darker by adding more tea leaves. On this occasion, which factor speed up diffusion?

• State of matter

• Temperature

• Mass of the particle

• Size of the particle

Two gas jars are set up as shown. The lid is removed and the gas jars are left to stand. after some time, the contents of both gas jars are brown. Which process causes this to happen?

• Condensation

• Diffusion

• Evaporation

• Filtration

Fill in the blank: Diffusion is when particles move from an area of ______ concentration to an area of _________ concentration.

• low, high

• high, high

• high, low

• low, low