Which arrow represents the change of state described
above?
OM
ON
P

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12