If an object mass is 50 g, and it's volume is 10 cubic cm, what is it's density

A balanced chemical equation must have the same number of which of these on both sides of the equation? A) atoms B) reactants C) molecules D) compounds

Why is useful to use moles to measure chemical quantities

What is the mass of NaCl required to make 140 grams of a 12% solution of NaCl in water? A. 12 grams B. 14 grams C. 17 grams D. 18 grams

What is the minimum number of kilojoules needed to change 40.0 grams of water at 100 degree celsius to steam at the same temperature and pressure?

Which nuclear emission has the greatest penetrating power? (1) alpha particle (3) gamma radiation (2) beta particle (4) positron

Do all organisms perform meiosis?

which one of these reactions is energy released? A all reactions B no reactions C endothermic reactions D exothermic reactions

Why do ionic compounds conduct electricity when dissolved in water but most covalent compounds do not?

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.