Brownian motion, diffusion

1. Which key term describes the random movement of particles?

• a) Distillation

• b) Osmosis

• c) Brownian Motion

• d) Absolute zero �

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In which state can the particles only vibrate ?

• Solid

• Liquid

• Gas

• Plasma

In which two states are the particles randomly arranged ?

• Solid and gas

• Liquid and solid

• Liquid and gas

• Gas and solid

Which two states don't have a fixed shape ?

• Gas and liquid

• Liquid and solid

• Solid and gas

• None of the above

How does the rate of diffusion change with an increase in temperature?

• a) Faster
• b) Slower
• c) Unaffected
• d) Impossible to tell

How does the rate of diffusion change with a decreases in temperature?

• a) Faster
• b) Slower
• c) Unaffected
• d) Impossible to tell

Ammonia gas is reacted with hydrogen chloride gas using the apparatus shown. Solid ammonium chloride is produced

• Ammonia solution is a base and hydrogen chloride solution is an acid.

• Ammonia molecules diffuse more slowly than hydrogen chloride molecules.

• Hydrogen chloride has a greater molecular mass than ammonia.

• Hydrogen chloride moves by Brownian motion.

Tags

NGSS.MS-PS1-2

Hydrogen chloride gas, HCl, reacts with ammonia gas, NH₃, to form solid ammonium chloride. The apparatus is set up as shown. After a few minutes, solid ammonium chloride forms where the two gases meet.

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A bottle of aqueous ammonia is placed on a table in a corner of the laboratory. The stopper is removed and after a few minutes all the students in the room can smell the ammonia. Which process occurs?

• demonstration

• diffusion

• dissolving

• distillation