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- 1. Multiple Choice
Diffusion is the natural movement of molecules from:
Areas of low concentration to areas of high concentration
Areas of high concentration to areas of low concentration
Cold to hot environments
Gaseous to liquid environments
- 2. Multiple Choice
Which of the following describes molecules moving down a concentration gradient?
Sugar settling at the bottom of a water glass
A cell with lots of water in it absorbing even more water
A bottle of soda in which bubbles of carbon dioxide are evenly distributed
Warm air moving from a radiator to fill up a room
- 3. Multiple Choice
Which of the following describes a state of equilibrium?
A group of molecules that have stopped moving completely
A room whose temperature is consistent throughout
Carbon dioxide bubbles escaping from a soda bottle when it's opened
A tree's roots absorbing nutrients from the soil
- 4. Multiple Choice
When do molecules stop moving or vibrating?
When equilibrium is reached
Never
When the temperature is below 0 degrees Celsius
When the substance they are part of becomes a solid
- 5. Multiple Choice
What causes diffusion?
The constant, random motion of molecules
Magnetic attraction between atoms
The nuclear forces that hold atoms together
The tendency of atoms to form chemical bonds with one another
- 6. Multiple Choice
From fastest to slowest rate of diffusion, which of the following is in the correct sequence?
Solids, liquids, gases
Liquids, gases, solids
Gases, liquids, solids
Gases, solids, liquids
- 7. Multiple Choice
Which of the following will diffuse the fastest?
A tablespoon of sugar in a glass of water
Heat through a solid piece of steel
A pinch of salt in a glass of water
The smell of bacon cooking throughout a room
- 8. Multiple Choice
Why is diffusion so important in biology?
It's the basic power source for most types of cells
It allows substances to move across cell membranes
It prevents toxins from entering our bodies
Without diffusion, cell division could not take place
- 9. Multiple Choice
What happens to the coffee particles when coffee is added to hot water?
They sink to the bottom of the cup
They spread out
They clump together
They freeze
- 10. Multiple Choice
What does a 'region with high concentration' mean?
An area with a SMALL number of particles
An area with a LARGE number of particles
An area with an UNEVEN number of particles
An area with no particles
- 11. Multiple Choice
Diffusion is the movement of particles from an area of _____ concentration to an area of ______ concentration
High, Low
Low, High
Low, Low
High, High
- 12. Multiple Choice
What does “area of high concentration” mean?
Spread out
Tightly packed together
Uncrowded
Spacious
- 13. Multiple Choice
An increase in temperature does what to diffusion?
Speeds it up
Slows it down
Nothing
Stops it all together
- 14. Multiple ChoiceWhat happens to particles when they are heated?They speed up and spread outThey slow down and compressThey stop movingThey move closer together and speed up
- 15. Multiple Choice
Which gases move into and out of the blood at the lungs by diffusion
Nitrogen and Oxygen
Oxygen and Carbon Dioxide
Nitrogen and Carbon Dioxide
Argon and Nitrogen
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