Select THREE examples of pure substances.
a. air
b. a pizza
c. oxygen gas
d. a gold brick
e. a block of ice
f. a glass of salt water

it would be C, D, E

A is a mixture

B is a mixture

C is a pure substance because Oxygen gas by the chemical symbol O2, is strictly pure

D is pure substance because Gold is one of the basic elements found naturally in nature, and as such, in its pure form

E is a pure substance because Both ice and liquid water are the same substance. H2O Though ice water is a mixture of both solid and liquid it is a pure substance, based on the molecular structure of its components .

F is a mixture

Hope this helps! If so please Mark brainliest and rate/heart if it does help!

Select THREE examples of pure substances?

a gold brick , oxygen gas, a block of ice

Explanation:

The above mentioned names are all pure substances as they contain no contamination and does not give room to be contaminated

your answer is "the 1950's"

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this