2 A white powder was placed in the melting point apparatus shown in Figure 2. The oil in the apparatus had a high boiling point. The
chemist carrying out the test noted that the white powder started
to melt at 158°C and finished melting at 169°C.
a What was the melting range of the white powder? [1 mark]
b What does this information tell us about the white powder?
[1 mark]
c Why was oil, and not water, used in the apparatus? [1 mark]

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.