Consider the balanced equation for the following reaction: 8O2(g) + C5H12(l) → 5CO2(g) + 6H2O(l)
If 2 grams of O2(g) reacts with an 20g of C5H12(l) and 25cm3 of CO2(g) is formed, determine the percent yield of O2(g).

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.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.