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22. Which of the following phenomena shows that diffusion
has occurred?
1.
Mothballs become smaller when exposed to air.
2.
Balloons deflate and become smaller.
3.
The aroma of coffee spreads through the air.
4.
A puddle of water disappears on hot days
Answers
Answer:
2. Balloons deflate and become smaller.
3. The aroma of coffee spreads through the air.
Explanation:
Explanation for correct options:
2. Balloons deflate and become smaller.
Due to the property of diffusion in gases an exaggerated air balloon deflates. Diffusion property in gases is veritably fast. The molecules in a balloon are under advanced pressure and their concentration is advanced (packed more nearly together) hence the diffusion from outside to outside takes place, but by the veritably nature of diffusion outside to inside takes place very fast, when gouged with a leg making the balloon to deflate.
3. The aroma of coffee spreads through the air.
Aroma of coffee spreads through the air because of process of diffusion. In diffusion, coffee patches move from the coffee mug(an area of high concentration) to the rest of the area(an area of low concentration).
Explanation for incorrect options:
1. Mothballs become smaller when exposed to air.
Sublimation is a chemical process where a solid turns into a gas without going through a liquid stage. For example, the moth balls get lower in size when kept exposed to air for a many days. This happens because of sublimation.
4. A puddle of water disappears on hot days.
Evaporation happens when a liquid is hotted. For example, as the sun heats water in a puddle of water, the puddle sluggishly shrinks. The water seems to vanish, but it actually moves into the air as a gas called water vapor.
Therefore, option 2 and 3 are correct.
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All of the given phenomena show that diffusion has occurred.
Mothballs become smaller when exposed to air because the naphthalene molecules in the mothballs diffuse into the air.
This diffusion causes the mothballs to lose mass and become smaller over time.
Balloons deflate and become smaller due to the diffusion of gas molecules through the walls of the balloon.
The gas molecules move from an area of high concentration (inside the balloon) to an area of low concentration (outside the balloon), causing the balloon to deflate.
The aroma of coffee spreads through the air due to diffusion.
The volatile compounds that give coffee its aroma diffuse into the air and spread out from the source.
A puddle of water disappears on hot days due to evaporation, which is a type of diffusion.
The water molecules in the puddle gain enough energy from the heat to escape into the air, diffusing from an area of high concentration (the puddle) to an area of low concentration (the surrounding air).
All of the given phenomena show that diffusion has occurred.
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