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combination of two or more substances that are not chemically combined

physical change

each chemical keeps its identity

can be separated easily

separated by magnets, distillation/heat, and a centrifuge

appearance and properties are the same

component that is larger is a solvent

smaller amounts are solutes

grams of solute per milliliter

dilute solution - small amount of solute

concentrated solution has more

solubility increases, as temperature increases.

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a pure substance composed of two or more elements

properties are different from the elements that make it

different materials exist after the reaction

compounds are chemical changes

characteristic properties are melting point, boiling point, density, and color

chemical property examples include heat and light

every compound has a unique set of properties

identify properties by measuring and observing

broken down by heat or electricity

elements are always present in a fixed ratio

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a pure substance that can not be separated into simpler substances

pure substance - basic particles are identical

classified into 3 groups

metals, nonmetals, and metalloids

metals are tend to be shiny solids

conduct heat and electricity well

do not conduct heat or electric current very well

most nonmetals are gases

solid nonmetals have a dull appearance

some properties of metals and some of nonmetals

electric conductivity of metalloids can vary