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CHEM 120 Exam #1 – Questions and Answers
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CHEM 120 Exam #1 – Questions and Answers
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CHEM 120 Exam #1 – Questions and Answersdefine matter - -anything that has mass and takes up space
-what is not considered matter? - -light, heat, electricity
-definite shape, definite volume - -solid
-indefinite shape, definite volume - -liquid
-indefinite shape, indefinite volume - -gas
-pure substance - -one substance; definite and constant composition; can't
be separated into 2 kinds of matter by physical means; single kind of matter
-heterogeneous mixture - -nonuniform in appearance; visibly different
phases
-homogeneous mixture - -visibly one distinct phase; uniform properties
-examples of pure substances - -water, sugar, table salt
-examples of heterogeneous mixtures - -trail mix, chocolate chip cookies,
cereal and mix
-examples of homogeneous mixtures - -chocolate milk, orange juice, salt
water
-element v compound - -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 - -physical combinations of substances -v- chemical
combination of substances
-most abundant elements in the universe as a whole plus in earth's crust - -
hydrogen and oxygen
-two most abundant elements in the earth's crust - -oxygen and silicon
-Ag - -silver
-Al - -aluminum
-Ar - -argon
, -Au - -gold
-B - -boron
-Ba - -barium
-Be - -beryllium
-Br - -bromine
-C - -carbon
-Ca - -calcium
-Cl - -chlorine
-Cu - -copper
-F - -fluorine
-Fe - -iron
-H - -hydrogen
-He - -helium
-Hg - -mercury
-I - -iodine
-K - -potassium
-Pt - -platinum
-U - -uranium
-Li - -lithium
-Mg - -magnesium
-N - -nitrogen
-S - -sulfur
-Zn - -zinc
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