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20 terms

Mr. Nerboso - Chemistry Study Guide 1

STUDY
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matter
anything that has mass and takes up space (stuff)
pure substance
a single kind of matter that has a specific set of properties
(each different element is a pure substance)
chemistry
study of the properties of matter and how matter changes
properties
characteristics or traits of a substance that help to identify or classify it
physical properties
characteristic that can be observed/measured without changing a material chemically
examples: mass, volume, density, state, texture, color, hardness, melting point, boiling point
chemical properties
characteristic that can only be observed/measured during a chemical reaction
examples: reactivity, flammability, new substance, heat/light released, color change, odor change, smoke
physical change
changes the form or appearance of matter but does not make any new substances
chemical change
change in matter that produces one or more new substances
solid
state of matter that has a definite shape and volume
liquid
state of matter that has a definite volume but no definite shape
gas
state of matter that has no definite shape or volume
melting point
unique temperature that a substance starts to melt
boiling point
unique temperature that a substance starts to boil
heat energy
is a form of energy that moves from warmer objects to less warm objects
condensation
the change of state from a gas to a liquid
vaporization
the change of state from a liquid to a gas
sublimation
the change of state from a solid directly to a gas
melting
the change of state from a solid to a liquid
freezing
the change of state from a liquid to a solid
evaporation
when vaporization occurs only on the surface of a liquid