Practice!

Sample Problem

 is an atom of element A

 is an atom of element B

 is an atom of element C

Using the above information, answer the following questions:

i.  is most specifically described as

Element AB2

Molecule A2B

Compound AB2

Atom AB2

None of the above

ii.  can be described as (check all that apply)

Element A2C3

Molecule A2C3

Compound A2C3

Atom A2C3

None of the above

Solution

Count the number of atoms corresponding to the substance.

The first substance is AB2 and the second substance is A2C3. Note the distinction that compounds consist of two or more atoms of different elements bonded together while molecules consist of a bond between any two atoms.