Chemical Bonds
and Compounds
The properties of
compounds depend
on their atoms and
chemical bonds.
Key Concepts
SECTION
1
Elements combine to
form compounds.
Learn the difference between
elements and compounds.
Learn how to write and name
chemical compounds.
SECTION
2
Chemical bonds
hold compounds
together.
Learn about the different
types of chemical bonds.
SECTION
3
Substances’ properties
depend on their bonds.
Learn how bonds give
compounds certain properties.
Prepare and practice for
the FCAT
• Section Reviews, pp. 259,
268, 273
• Chapter Review, pp. 276–278
• FCAT Practice, p. 279
CLASSZONE.COM
• Florida Review: Content
Review and FCAT Practice
252 Unit 2: Chemical Interactions
How
Whatdo
canthese
theseskydivers
stay
together?
skydivers
do How is
this
similar
to they
the way
together
that
atoms
stay
together?
can’t do
apart?
Mixing It Up
Get some red and yellow
modeling compound.
Make three red and two
yellow balls, each about
the diameter of a nickel.
Blend one red and one
yellow ball together. Blend
one yellow and two red
balls together.
Observe and Think How different
do your combinations look from the
original? from each other?
The Shape of Things
Pour some salt onto dark paper. Look at the
grains through a hand lens. Try to observe a
single grain.
Observe and Think What
do you notice about the
salt grains? What do you
think might affect the way
the grains look?
Internet Activity: Bonding
Go to ClassZone.com and watch the animation
showing ionic and covalent bonding. Observe
the differences in the two types of bonding.
Observe and Think
What’s the difference
between an ionic and a
covalent bond? Explain
how covalent bonding
can have different
characteristics.
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Compounds Code: MDL023
Chapter 8: Chemical Bonds and Compounds 253
CHAPTER 8
CONCEPT REVIEW
VOCABULARY REVIEW
• Electrons occupy a cloud
around an atom‘s nucleus.
electron p. 225
element See Glossary.
• Atoms form ions by losing or
gaining electrons.
FLORIDA REVIEW
CLASSZONE.COM
Content Review and FCAT Practice
TAKING NOTES
MAIN IDEA AND
DETAIL NOTES
VOCABULARY
STRATEGY
Place each vocabulary
term at the center of
a description wheel
diagram. Write some
words describing it on
the spokes.
MAIN IDEAS
Atoms combine
in predictable
numbers.
DETAIL NOTES
• Each compound has a specific ratio
of atoms.
• A ratio is a comparison between two
quantities.
Writing chemical
formulas
• Find symbols on the periodic table.
• Note ratio of atoms with subscripts.
wr
the itten
to
r
a
sy ight
mb of
ol
Make a two-column chart.
Write the main ideas, such
as those in the blue headings, in the column on the
left. Write details about
each of those main ideas
in the column on the right.
indicates
number of
atoms per
molecule
SUBSCRIPT
low
be ol
y
htl mb
slig e sy
th
254 Unit 2: Chemical Interactions