2. Atoms
An atom is the smallest, most basic particle from which
matter is created.
Just think:
A sheet of paper is about 10,000 atoms thick
There are 2,000,000,000,000,000,000,000 atoms of oxygen in
a single drop of water
There are about a billion billion atoms in the period at the
end of a sentence in your textbook
3. Molecules
A molecule is a group of 2
or more atoms that are held
together by chemical bonds
A chemical bond is the
force that holds two
atoms together
Molecules can contain the
same or different atoms (as
long as there are 2 or more)
4. Pure Substances
A pure substance is made of only one type of matter and has
a definite set of properties.
Every sample of pure substance is the same, no matter what
form it is in
Pure substance can be either :
Elements
Compounds
5. Elements
An element is a pure substance that is made from one type of
atom (by one or more atoms.)
Elements cannot be broken down into other substance by
chemical or physical means
Elements have their own specific physical and chemical
properties
Examples: Carbon (C), Oxygen (O), Hydrogen (H)
6. Compounds
A compound is a pure substance that is made of 2 or more
elements that are chemically combined in a set ratio
Compounds can be represented by a chemical formula
Compounds have properties that are different from the
elements that make them
CH3COCH3
C8H10N4O2 H 2O
Caffeine CHCl3 Acetone CH3CH2OH Water
Chloroform (Nail Polish Remover) Ethanol
7. Mixtures
A mixture is made of two or more substances that are
together in the same place but not chemically combined.
Each individual substances keep their separate properties
Ex.: beach sand, lemonade
There are 2 types of mixtures:
Heterogeneous Mixtures - you can see the different parts
Homogeneous Mixtures - these are so evenly mixed that
you can’t see the different parts (ex. solution)
8. Concept Map
Types of
Matter
Solution, Element, Mixture, Atoms, Homogeneous Mixture, Pure
Substance, Heterogeneous Mixture, Compound
