Apure substance that can't be broken down into simpler substances by chemical or physical means.
a. chemical
b. atom
c. element
d. mineral

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled