When determining the mass of product used or reactant consumed, the number of moles must be determined before comparing two substances because Question 10 options: A) atoms have the same mass but moles are different for each substance. B) masses are the same for different substances. C) different substances have different masses due to their atomic make-up. D) moles react.

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water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

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.

gas and precipitate r the correct answers