Deres
utrum
wotassium
common
ials
solubilj
gunds in water
common exceptions
contain
none
ionics
barium
calcium
sodium
magnesium
aluminum
manganese
zinc
chromium
none
ne
office depot
19 activity
4. how many moles of iron (1) oxide, feo, will be produced if two moles of iron are reacted with
an excess of oxygen?
2fe + 02 - 2 feo mule
a. 1 mole of feo
b. 2 moles of feo
c. 3 moles of feo
d. 4 moles of feo

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.