CHEM 120 Exam #1 Questions With Complete Solutions

define matter correct answer: anything that has mass and takes up space what is not considered matter? correct answer: light, heat, electricity definite shape, definite volume correct answer: solid indefinite shape, definite volume correct answer: liquid indefinite shape, indefinite volume correct answer: gas pure substance correct answer: one substance; definite and constant composition; can't be separated into 2 kinds of matter by physical means; single kind of matter heterogeneous mixture correct answer: nonuniform in appearance; visibly different phases homogeneous mixture correct answer: visibly one distinct phase; uniform properties examples of pure substances correct answer: water, sugar, table salt examples of heterogeneous mixtures correct answer: trail mix, chocolate chip cookies, cereal and mix examples of homogeneous mixtures correct answer: chocolate milk, orange juice, salt water element v compound correct answer: can't be broken down into simpler substances by chemical or physical means -v- can be broken down into elements by chemical, but not physical means mixture v compound correct answer: physical combinations of substances -v- chemical combination of substances most abundant elements in the universe as a whole plus in earth's crust correct answer: hydrogen and oxygen two most abundant elements in the earth's crust correct answer: oxygen and silicon