Which statement explains why br2 is a liquid at stp and i2 is a solid at stp? (1) molecules of br2 are polar, and molecules of i2 are nonpolar.
(2) molecules of i2 are polar, and molecules of br2 are nonpolar.
(3) molecules of br2 have stronger intermolecular forces than molecules of i2.
(4) molecules of i2 have stronger intermolecular forces than molecules of br2.

Option (4) is the correct answer.

Explanation:

In solids, there is strong force of attraction between the molecules. Whereas in liquids the force of attraction between the molecules is slightly less as compared to solids.

Thus, we can conclude that is a liquid at STP and is a solid at STP because molecules of have stronger intermolecular forces than molecules of .

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the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.