elements_compounds_mixtures-ypauhb.ppt

Essential Question:
How are elements,
compounds, and mixtures
related?
S8P1b. Describe the difference
between pure substances (elements
and compounds) and mixtures

Matter is anything that has mass and
takes up space (volume)
There are different types of Matter:
Pure Substances (elements and
compounds) and Mixtures
The composition (structure) of a
substance determines its Matter type.

Elements,
Compounds, and
Mixtures
Activating
Strategy
[see resources]
Elements, Compounds, and Mixtures Activating Strategy
Directions:
 Make copies of the Substance Pictures for groups of 2-3 in each class period
 Cut out the Substance Pictures and place them in baggies or envelopes for groups
 Groups will be asked to take the Substance Pictures and form three groups. A group
for Elements, Compounds, and Mixtures.
 Make sure students understand that this is an activating strategy so they may or may
not already know all the information. They are to make their best guess as long as
they can justify their grouping methods.
 Once finished, have groups share some of their thoughts with other groups about the
activity. You may or may not want to go over answers, but you need to discuss as a
class some of the differences they noticed in the Substances
 By the end of the lesson on Element, Compounds, and Mixtures, students should be
able to do this activity again.
Substance Pictures

While viewing the lesson, record your
notes on the Graphic Organizer
Provided by the teacher. [see resources]
Matter
Pure Substances Mixtures
Elements Compounds Heterogeneous
Mixture
Homogeneous
Mixture

Characteristics of
Pure Substances
• Fixed composition
• Distinct properties
• Cannot be separated into simpler substances
by physical methods
• Can only be changed in identity and
properties by chemical methods
• Properties do not vary one sample to another
sample

Types of
Pure Substances:
Elements
And
Compounds

Elements
•Made up of one type of atom
•Cannot be broken down by
physical and chemical methods
•Examples: Oxygen, Nitrogen, Carbon
Sample of the
Element Lead
Sample of the
Element Chlorine

Compounds
• Form when two or more
different elements join (bond)
together chemically
• Composition is identical in each sample
• Can be separated only by chemical methods
• Properties of a compound are totally
different than the properties of the elements
that form them
• Examples: Water, Carbon dioxide, Sugar
Animated images and notes from http://www.chem.purdue.edu/gchelp/atoms/elements.html

Elements and Compounds
Study Jams Video
http://studyjams.scholastic.com/studyjams/jams/sc
ience/matter/elements-and-compounds.htm

Mixtures
• Form when elements and/or compounds
are combined physically
• Properties of a mixture are related to its
components
• Composition varies from sample to sample
• Can be separated by physical methods
• Examples of Mixtures: Tea, Perfume, Air,
Salad, Beach sand, oil and vinegar salad
dressing, etc.

Mixtures
Mixture of
Different Elements
Mixture of Different
Compounds

Mixtures
Mixtures are often referred to
as homogeneous or
heterogeneous.

Mixtures
• Homogeneous mixtures (Solutions) have
a uniform distribution.
• For example: Tea, Perfume, Air

Mixtures
• Heterogeneous mixtures
do not have a uniform
distribution.
• Parts are often visible
• For example:
Salad, Beach Sand,
Oil and Vinegar dressing

Mixtures Study
Jams Video
http://studyjams.scholastic.com/studyja
ms/jams/science/matter/mixtures.htm

Distinguishing between Elements,
Compounds, and Mixtures

The diagram below shows how two
elements can be mixed together…Which is a Compound?
A Mixture?
Compound
Mixture
A.
B.
C.
D.
Distributed Summarizing

Match the Picture to the Description
Mixture of Molecules
Element Molecule
Compound of 3
Elements
Element/ Atoms
Mixture of Atoms
Compound of 2
Elements

Elements,
Compounds, and
Mixtures
Matching Pairs
Activity
[see resources]
Elements, Compounds, and Mixtures Matching Pairs Activity
Directions:
 Make copies of both the Substance Pictures and the Substance Descriptions for
groups of 2-3 in each class period
 Cut out the Substance Pictures and Substance Descriptions and place them in
baggies or envelopes for groups
 Groups will match the numbered Substance Pictures with their correct Substance
Description.
 When a group is finished, their work must be checked by the teacher.
Substance Pictures

Additional Review Activities
[see resources]
Vocabulary Matching Pairs Types of Matter Cube Review

Summarizing Strategy:
Elements, Compounds,
& Mixtures
Constructed Response
[see resources]
Elements, Compounds, and Mixtures Constructed Response
Use the list of substances below to answer the following question.
 Water
 Table salt (NaCl)
 Pure gold ring
 Pizza
 Air
 Carbon dioxide (dry ice)
 Nitrogen
a. Categorize each substance as an element, a compound, or a mixture.
b. Explain how each substance belongs in the category you chose.
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elements_compounds_mixtures-ypauhb.ppt

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