2.3: What are pure substances and how are they classified?
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Transcript of 2.3: What are pure substances and how are they classified?
2.3: What are pure substances and how are they classified? Both
devices use properties to separate mixtures of matter into
A.A dip net is a traditional Aboriginal tool designed to separate
big fish from smaller fish or water. B.A device used to analyze
& identify the types of matter in a sample from a crime scene.
Both devices use properties to separate mixtures of matter into
their parts! Pure substances are elements & compounds
Matter is usually classified by its physical & chemical
properties. Early scientists grouped matter on how they could break
it apart. Matter that could be seperated into parts using
differences in physical properties was classified as a mixture.
Matter that is not a mixture is a pure substance. Classifying
Matter Pure Substances Pure Substance matter that contains only one
type of particle, so it cannot be sepeated into parts physically.
Examples:table sugar (sucrose), oxygen, pure water, copper,
aluminum. Each part of a pure substance has the same properties
however, the kinds of particles of one pure substance is different
from the particles of other pure substances. Pure Substances
Compounds & Elements There are two types of pure
substances
Compounds a pure substance made up of two or more elements that are
chemically combined.They can be broken down into elements again by
chemical reactions. Element a pure substance made up of one type of
particle that cannot be broken down into simpler parts by chemical
means. Compounds can be broken down & Elements cant!
Energy can be used to un-combine the compound into the two
individual elements again. The elements cannot be un-combined any
further. The Classification of Matter Answers Elements include
metals & non-metals
One way elements can be classified is to group them into two
categories: Metals elements that are commonly solid at room
temperature, shiny, malleable, ductile, & good conductors
Non-Metals elements that can be solid, liquid, or gas at room
temperature, dull, brittle, not ductile, & poor conductors
Classifying metals & non-metals Examples of metals &
non-metals Answers: