WS#9
MIXTURES
Name
Directions: HIGHLIGHT your answers to the questions in the reading before writing them down.
1. How many substances need to come
together to form a mixture?
A MIXTURE is a combination of two or more substances that are
combined physically but not chemically. When two or more
materials are put together, they form a mixture if they do not
change chemically to form a new substance.
2. Do these substances physically combine or
chemically combine?
For example, cheese, pepperoni and
tomato sauce do not react when they
are combined to make a pizza. They
keep their original identities and
properties. Ao a pizza is a mixture.
Unlike elements or compounds, mixtures are not
pure substances. Mixtures contain more than one
type of substance. Each substance in a mixture has
the same chemical makeup it had before the
mixture was formed.
Unlike pure substances, mixtures do not have
definite properties. Granite from different parts
of the world could contain different minerals in
different ratios. Pizzas made by different people
could have different toppings. Mixtures do not
have definite properties because they do not have
a defined chemical makeup.
TRAIL MIX
FRUIT
SALAD
GATORADE
PILE OF NUTS
AND BOLTS
PAINT
CHOCOLATE
CHIP COOKIE
3. Are mixtures pure substances?
(yes, no)
4. What does it mean “mixtures do not have definite
properties”?
5. Granite is a rock that is formed from cooled magma
underground. How is granite a mixture?
6. A mixture can be made up of many different
elements physically thrown together. Can you think
of an example of this? (Be creative)
WS#9
Mixtures can be classified as
homogeneous or heterogeneous. A
homogenous mixture is uniform
throughout and you cannot see the
individual parts. The substances in a
heterogeneous mixture are not
distributed evenly. You can see the
substances separate from each other.
HOMOGENEOUS
• uniform throughout
• cannot see the parts
HETEROGENEOUS
• can see the different substances
DIRECTIONS: Classify each mixture as homogeneous or heterogeneous.
HOMOGENOUS
MIXTURE
- substances are distributed evenly
throughout
- only 1 phase of matter observed.
- cannot see individual parts
chocolate chip ice cream
blood
lucky charms cereal
gasoline
Kool-aid
vinegar (C3HCOOH + H2O)
soil
sand and water (sand + H2O )
sugar water
(H2O + C12H22O11)
brass metal (Cu + Zn)
nail polish
chocolate milk
air (N2 + C2O + H2O + O2)
orange juice with pulp
oil and water (oil + H2O)
- substances are not distributed evenly
- can see the different substances
X
pizza
jello
HETEROGENOUS
X