Q: What are groups of atoms that behave as a single unit called? Choices: - protons - particles - ions - molecules A:
molecules

Q: What muscle is imperative to breathing in helping the air move in and out of the lungs? Choices: - uterus - spleen - kidneys - diaphragm A:
diaphragm

Q: Continuous-flow reactors are chemical reaction vessels in which the what are mixed and allowed to react as they flow along a tube? Choices: - reactives - generators - propellants - reactants A:
reactants