Lesson 11 –
Pure Substance or Mixture
You will examine eight different substances
to determine if they are pure substances or
mixtures.
Lesson 11 –
How can you determine the difference
between pure substances and mixtures?
Lesson 11
If I compare substances then I can tell mixtures
from pure substances because ____________.
Lesson 11 –
Answer the following questions using
complete sentences.
1. What is your definition of a pure substance?
2. Give two examples of pure substances.
3. Explain why you think each of the substances is
pure.
4. If you were given an unknown sample of matter,
how could you tell whether it was a pure substance
or a mixture?
Lesson 11
.
Lesson 11
.
Identifying Pure Substances or Mixtures
Sample
A
B
C
D
E
F
G
H
Pure Substance
or Mixture?
How did you reach your conclusion?
Lesson 11 –
Answer the following questions using
complete sentences.
1. How can the properties of pure
substances be used to discover whether a
sample is a mixture?
2. Were the samples all well mixed?
3. How did the extent of mixing affect your
investigation?
Lesson 11 –
Review your definition of a pure substance
from the getting started activity. If it is
different from the definition agreed upon by
the class, write down the new definition.
Lesson 11 –
• A pure substance has definite physical and
chemical properties.
• A mixture is made of two or more
substances with each substance keeping
its’ own properties.
• Solutions are mixtures.
• Compounds are not mixtures.
Lesson 11 –
51. pure substance - matter that has definite
chemical and physical properties; either an element or
a compound
52. mixture - two or more elements or compounds
that are mixed together but are not chemically
combined; differ in physical and chemical properties.
53. heterogeneous - different (poorly mixed)
54. homogeneous - same (well-mixed)
55. solution - a homogeneous mixture of a solvent
and a solute
56. material - the substance from which
something is made