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24 terms

Ch4 Matter and Energy (WIP)

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physical states
the three states held by matter: solid, liquid, gas
solid state
matter has a fixed shape and a fixed volume
liquid state
matter has a variable shape, but fixed volume
gaseous state
matter has a variable shape and volume, but compression is significant
sublimation
solid to gas
melting
solid to liquid
vaporizing
liquid to gas
condenses
gas to liquid
freezing
liquid to solid
deposition
gas to solid
heterogeneous mixture
can be separated into pure substances by physical methods, properties are indefinite and vary
homogeneous mixture
properties are definite constant for a given sample
alloy
a homogeneous mixture of two or more metals
substance
matter that has definite composition and constant properties
compound
predictable properties, but can be broken down into elements by ordinary chemical reactions
element
a substance that cannot be broke down further by a chemical reaction
chemical symbol
the abbreviated name of each element used to identify the element on the periodic table
atom
individual particles that make up an element
semimetal (or metalloid)
an element that typically has properties midway between those of metals and nonmetals
metal
an element that typically is a solid, has bright metallic luster, high density, high melting point, and good conductor of heat and electricity
malleable
property of metal meaning it can be hammered into a thin sheet of foil
ductile
if the metal can be drawn into a fine wire
nonmetal
an element that usually has low density, low melting point, and poor conductor of heat and electrity
atomic number
the number that identifies a particular element