Asingle atom of oxygen cannot be subdivided into simpler substances by any physical or chemical means. therefore, it is:
select one:
a. a molecule
b. a compound
c. a mixture
d. an element

which mixture has the largest particle size?
select one:
a. solution
b. colloid
c. compound
d. suspension

which substance cannot be decomposed into simpler substance(s)?
select one:
a. iodine
b. alcohol
c. methane
d. ethanol

which of the following is not an example of a compound? a substance comprised of:
a. atoms of the same element
b. atoms of two different elements