Matter
Chemistry
Atoms, ____________________,
Compounds, Mixtures
● Matter is anything that has
___________ and takes up
___________
○ Anything you can ________ is composed
of matter
○ Some things you can’t see are matter (___)
○ Sound, light, forces, ___________ are not
matter
Atoms
● Atom: extremely small ___________ that is a
building block of matter
○ _____ matter is composed of ___________
○ A ______ atom has mass and takes up space
○ So small that it can’t be seen with a regular
light microscope
○ Electron microscopes are used to “see”
atoms
Atomic Structure
Elements
● Atoms are composed of three particles:
○ ___________: ___________-charged
particles in the nucleus
○ Neutrons: ________ particles in the nucleus
○ ___________: negatively-charged particles
that move ___________ the nucleus in the
electron cloud
● An element is a ________ substance that
consists of just ________ type of atom
○ An element can’t be broken down into
___________ substances
○ We currently know of ____ different elements
○ Only ____ are found in significant quantities
in nature. The rest are man-made in labs.
Atoms and Elements
● Elements are different from each other
because their ___________ are different.
● Each type of atom contains a different number
of ___________.
○ For example, each hydrogen atom contains
___ proton. Each helium atom contains __
protons. Each lithium atom contains ___
protons.
Elements and Compounds
Mixtures
● A compound is a pure substance made of
______ or more elements that are chemically
combined (____________)
○ Compounds can only be broken down into
simpler substances (____________) by
chemical changes
● A mixture is a physical combination of two or
more substances that ___________ their own
properties and are physically blended together
○ Mixtures ______ be broken down into
simpler substances by ____________
methods like filtration, separation and
evaporation
Types of Mixtures
Types of Mixtures
● A ____________geneous mixture is a
type of mixture in which the individual
substances are _____ evenly mixed
○ Two samples of the same mixture
can have ____________ amounts of
the substances.
○ Examples: bag of _____, fruit salad,
supreme pizza
● A homogeneous mixture is a type of mixture
that is ____________ throughout.
○ The substances are ____________ mixed
and cannot be separately seen
○ Two samples of the same mixture will have
the __________ amount of the substances.
○ Examples: air, steel, apple juice