Solutes and Solvents Quick Check

Question

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Question
A mother finds her daughter’s mug of hot cocoa on a table an hour after she had been drinking it. As the mother pours out the cocoa, she sees brown solids in the bottom of the mug. How can this be explained?(1 point)
Responses

The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went down.
The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went down.

The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went up.
The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went up.

This would only happen if too much cocoa powder was added in the first place, because the solubility should not change.
This would only happen if too much cocoa powder was added in the first place, because the solubility should not change.

All dissolved substances will come out of solution over time. If the mother waits long enough, then all of the powder will appear at the bottom of the mug.
All dissolved substances will come out of solution over time. If the mother waits long enough, then all of the powder will appear at the bottom of the mug.
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Answer 1

The correct answer is:

The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went down.

Explanation: When the hot cocoa was initially made, the cocoa powder was dissolved in hot water. However, as the drink cooled, the solubility of the cocoa decreased, meaning that not all of the cocoa could remain dissolved in the cooler liquid. This caused some of the cocoa to settle at the bottom of the mug.