1. How does increasing the surface area of a dry imbibant generally affect imbibition?
A.
It increases the rate of imbibition
B.
It stops imbibition completely
C.
It changes imbibition into osmosis
D.
It has no effect on imbibition
Correct Answer:
It increases the rate of imbibition
Explanation:
A larger surface area provides more contact between the imbibant and water, so water is absorbed more rapidly.
2. Which material will usually imbibe water faster when equal masses are used?
A.
A large whole seed
B.
A crushed seed
C.
A sealed seed
D.
A seed coated with wax
Correct Answer:
A crushed seed
Explanation:
Crushing increases the exposed surface area of the seed, allowing more contact with water and faster imbibition.
3. Why does powdered gum absorb water faster than a lump of gum?
A.
Powdered gum has a greater surface area
B.
Powdered gum has no imbibitional attraction
C.
A lump of gum contains more air
D.
Powdered gum cannot absorb water
Correct Answer:
Powdered gum has a greater surface area
Explanation:
The powder exposes more surface to water than the lump, increasing the rate of imbibition.
4. If a dry sponge is cut into several small pieces, what happens to its total exposed surface area?
A.
It generally increases
B.
It becomes zero
C.
It always decreases
D.
It remains exposed only on one side
Correct Answer:
It generally increases
Explanation:
Cutting the sponge creates additional surfaces, increasing contact with water and promoting faster imbibition.
5. Which seed is expected to imbibe water more quickly under the same conditions?
A.
An intact seed
B.
A seed split into smaller pieces
C.
A seed covered with waterproof material
D.
A seed kept away from water
Correct Answer:
A seed split into smaller pieces
Explanation:
Splitting the seed increases its exposed surface area, allowing water to contact more imbibitional surfaces.
6. In an experiment on imbibition, why is a powdered sample likely to gain water faster than a solid block of the same material?
A.
The powdered sample has more surface area exposed
B.
The powdered sample has less contact with water
C.
The solid block cannot contain imbibants
D.
The powdered sample has no attraction for water
Correct Answer:
The powdered sample has more surface area exposed
Explanation:
Greater exposed surface area permits more water molecules to interact with the imbibant at the same time.
7. Which change would most directly increase the surface area of an imbibant?
A.
Grinding it into smaller particles
B.
Covering it with wax
C.
Joining particles into one large lump
D.
Placing it in a dry container
Correct Answer:
Grinding it into smaller particles
Explanation:
Grinding breaks the material into smaller particles and increases the total surface area available for water absorption.
8. Two equal masses of dry seeds are placed in water. One sample is whole and the other is crushed. Which sample will usually show faster imbibition?
A.
The whole-seed sample
B.
The crushed-seed sample
C.
Both will always imbibe at exactly the same rate
D.
Neither sample can imbibe water
Correct Answer:
The crushed-seed sample
Explanation:
Crushed seeds have a larger exposed surface area, so water can contact and enter the imbibitional material more quickly.
9. What is the main reason that increasing the surface area speeds up imbibition?
A.
More imbibant surface comes into contact with water
B.
It removes all water from the surroundings
C.
It prevents the imbibant from swelling
D.
It changes the imbibant into a liquid
Correct Answer:
More imbibant surface comes into contact with water
Explanation:
Increased contact area allows water to be attracted and absorbed over a larger surface, increasing the rate of imbibition.
10. Which arrangement of the same dry material will generally absorb water fastest because of surface area?
A.
A single compact block
B.
Several small pieces
C.
A sealed container of the material
D.
A block covered with oil
Correct Answer:
Several small pieces
Explanation:
Several small pieces expose more total surface area than one compact block, resulting in faster imbibition.
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