Question

Freezing point depression is:

A. When a substance freezes and then quickly drops in temperature.
B. When a substance drops in temperature until it freezes, then quickly rises in temperature but stays frozen.
C. When a substance does not need to be as cold as normal in order to freeze.
D. When a substance must be colder than normal in order to freeze.

Answer 1

Freezing point depression is when a substance must be colder than normal in order to freeze.

• Freezing point is that temperature where a liquid substance becomes a solid i.e. freezes.

• Freezing point depression is the process whereby the temperature at which a substance freezes is lowered.

Freezing point depression often occurs when a solute is added to a solvent. This reduces its freezing point. Since temperature is reduced, in other words, this means that the substance must become colder than normal for it to start freezing.

Hence, freezing point depression is when a substance must be colder than normal in order to freeze.

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Answer 2

D. When a substance must be colder than normal in order to freeze.

Explanation:

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