(Multiple Choice, 30 pts)

A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?

A. He is incorrect, because water can dissolve ionic solids.
B. The test proves nothing, because water dissolves all solids.
C. He is correct, because polar liquids cannot dissolve ionic solids.
D. The test proves nothing, because it only shows that the solid is a compound.

(I know water is polar, so I think its a?)

a.

Explanation:

Ionic compounds like salt (sodium chloride) can easily dissolve in water as water is a polar molecules. Ionic compounds have an either full positive charge or a full negative charge which means that either the hydrogen or the oxygen on the water will bond to it.

Covalent compounds only have partial charges which makes it way harder to bonds. Objects such as oil, CnH2n+2, are covalent. Since oil is not soluble in water, the final answer is A.

The answer is A

Explanation:

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explanation:

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