This type of drug slows down, reduces, or dulls bodily functions. a. stimulants b. depressants c. hallucinogens

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Helium decays to form lithium. which equation correctly describes this decay?

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures