20.2 Oxidation Numbers
Key Objectives
20.2.1 STATE the general rule for assigning
oxidation numbers.
20.2.2 DEFINE oxidation and reduction in
terms of a change in oxidation number.
CHEMISTRY
Y
&YOU
Q: Why does a sparkler have such a bright light? If you have ever seen or held
a sparkler, then you know that sparklers give off very bright light. They are
like handheld fireworks. Sparklers contain powdered metals. As the sparklers burn, a chemical reaction changes the metals. In this lesson, you will
learn about how oxidation and reduction in reactions like these are defined
in terms of a change in oxidation number.
Additional Resources
Reading and Study Workbook, Lesson 20.2
Available Online or on Digital Media:
• Teaching Resources, Lesson 20.2
Assigning Oxidation Numbers
What is the general rule for assigning oxidation numbers?
Key Questions
What is the general rule for
assigning oxidation numbers?
How are oxidation and
reduction defined in terms of a
change in oxidation number?
Vocabulary
toxidation number
An oxidation number is a positive or negative number assigned to an atom to
As a general rule, a bonded
indicate its degree of oxidation or reduction.
atom’s oxidation number is the charge that it would have if the electrons in
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