1 The alkanes are generally unreactive. Their reactions include combustion, substitution and cracking.
(a) The complete combustion of an alkane gives carbon dioxide and water.
(i) 10 cm3
of butane is mixed with 100 cm3
of oxygen, which is an excess. The mixture
is ignited. What is the volume of unreacted oxygen left and what is the volume of
carbon dioxide formed?
C4H10(g) + 6 O (g) 2 2
1 4CO2(g) + 5H2O(l)
cm3 Volume of oxygen left =
Volume of carbon dioxide formed = cm3

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.

ok whats the question if not i cannot you i need question and need a thing to answer

the answer is symmetrical : )