Question

A single 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

Answer 1

1. Anything that cannot be subdivided into simpler substances by chemical means is an element.

2. Suspension, it's a mixture of solid particles suspended in a liquid. Compound is not a mixture by the way.

3. Iodine, it is an element.

4. Atoms of the same element.