Question 1.
given fe2o3, how many atoms are present in one molecule?
a. 1 atom of fe2o3
b. three sets of these molecules: 1 atom of fe, and 2 o's
c. 1 f, 2 e's, 3 o's
d. 2 fe's, 3 o's
question 2.
when wildfires make washington air smoky, we use air purifiers in homes to separate the smoke from the air we breathe.
you can read more about these methods here:
do you think activated carbon filters use physical or chemical means (or both) to separate the impurities from the air? explain your ideas.

Explanation:

D. 2 Fe's, 3 O's

An atom is the smallest indivisible particle of a substance. Most notations of elements in actual sense depicts the combining atoms.

In Fe₂O₃, the subscript gives the idea of the number of combining atoms and their combining ratios. Here, weh have 2 atoms of Fe and 3 atoms of Oxygen.

Activated carbon filters use chemical means to seperate impurities from air:

Chemical reactions occurs when compounds are formed. Activated carbon filters are made up of activated carbons in which impurities have been removed and the pores of the carbon structure have become widened. This leaves the carbon with much surface area for chemical reaction to occur between impurities and the carbon in form of chemical adsorption. One important thing to note is that, in chemical change, it is difficult to resolve the reactants after the product is formed. In physical change, simple seperation techniques are used to seperate the reactants out.

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