Quick Review …
Matter is something that has mass and
takes up space.
 It is made up of atoms which are tiny
pieces of matter made up of protons,
neutrons and electrons.
 Atoms are divided up into different types
(elements) based on the number of
protons it has.


Element: A substance that CANNOT be
broken down into simpler substances by
chemical means, it is made up entirely
of one type of atom
We can find all the different elements
on the periodic table.
Molecule: A substance that has two or
more atoms joined together by a
chemical bond

Examples: Hydrogen gas H2, Oxygen
gas O2, Water H2O, Methane CH4
Compound: A substance made up of
atoms of two or more different elements
joined by chemical bonds

Examples: Carbon dioxide CO2,
Glucose C6H12O6
What’s the difference between a
molecule and compound?
What’s the difference between a
molecule and compound?
 Compounds have to have at least two
different elements bonded together
whereas molecules could be the same
element bonded together.
Are all compounds
molecules?
Are all compounds molecules?
 Yes, compounds have two or more
atoms joined together which is what is
required to be a molecule
Are all molecules compounds?
Are all molecules compounds?

No, molecules could have the same
atoms bonded together and to be a
compound they have to be different
Which of these are molecules?
Which of these are compounds?
Mixtures: A combination of two or more
substances that are not chemically
combined
Homogeneous Mixture – is the same
throughout
Examples: apply juice, tea, sugar water
Homogenous Mixture
Homogenous Mixture
Homogenous Mixture
Homogenous Mixture

Salt water
Heterogeneous Mixture – not uniform
throughout, has different parts that you
can see
Examples: soil samples, orange juice with
pulp, chicken noodle soup
Heterogeneous Mixture
Heterogeneous Mixture
Heterogeneous Mixture
Heterogeneous Mixture
Brain storm with your shoulder buddy two
more examples of each type of mixture.
Solutions: A type of homogenous mixture
*Kool-aid is a solution of water, sugar
and kool-aid mix
There are two parts to a
solution…
1) Solvent – material in which the solute is
dissolved
*For kool-aid water is the solvent
2)
Solute – the substance that is
dissolved in the solvent
*For kool-aid, sugar and kool-aid mix
are the solutes
Practice with the chart on your paper…