A student lists the numbers of fish, snails, and frogs in an aquarium. Which TWO terms describe this type of data? O A. Qualitative
O B. Quantitative
C. Continuous
O D. Discrete

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

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

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?