Daily Quiz

1
Daily Quiz
2
Daily Quiz

• 1. What type of reaction is this?
• Ca Br2 ? CaBr2
• a. Synthesis
• b. Decomposition
• c. Combustion
• d. Single replacement
• e. Double replacement

3
Daily Quiz

• 2. To be happy, an atom needs all of the
  following except
• Equal numbers of and - charges
• Equal numbers of neutrons and protons
• Electron shells are exactly full

4
Daily Quiz

• 3. When calcium ionizes, its charge becomes
• 1
• 2
• -2
• -1
• 0

5
Daily Quiz

• 4. When sodium gives an electron to chlorine,
  chlorine is
• oxidized
• reduced
• HINT Remember the lion!

6
Today we will

• Review the homework
• Look at the rules for determining oxidation number

7
Homework
Questions 1-3 on page 640
8
Homework

• 1. Identify each of the following changes as
  either oxidation or reduction. Recall that e- is
  the symbol for an electron.
• I2 2e- ? 2I-

9
Homework

• 1. Identify each of the following changes as
  either oxidation or reduction. Recall that e- is
  the symbol for an electron.
• I2 2e- ? 2I-
• reduction

10
Homework
1. Identify each of the following changes as
either oxidation or reduction. Recall that e- is
the symbol for an electron. b. K ? K e-
11
Homework
1. Identify each of the following changes as
either oxidation or reduction. Recall that e- is
the symbol for an electron. b. K ? K
e- oxidation
12
Homework
1. Identify each of the following changes as
either oxidation or reduction. Recall that e- is
the symbol for an electron. c. Fe2 ? Fe3
e-
13
Homework
1. Identify each of the following changes as
either oxidation or reduction. Recall that e- is
the symbol for an electron. c. Fe2 ? Fe3
e- oxidation
14
Homework
1. Identify each of the following changes as
either oxidation or reduction. Recall that e- is
the symbol for an electron. d. Ag e- ? Ag
15
Homework
1. Identify each of the following changes as
either oxidation or reduction. Recall that e- is
the symbol for an electron. d. Ag e- ?
Ag reduction
16
Homework
2. Identify what is oxidized and what is reduced
in the following processes. a. 2Br- Cl2 ? Br2
2Cl-
17
Homework
2. Identify what is oxidized and what is reduced
in the following processes. a. 2Br- Cl2 ? Br2
2Cl- ox red
18
Homework
2. Identify what is oxidized and what is reduced
in the following processes. b. 2Ce 3Cu2 ? 3Cu
2Ce3
19
Homework
2. Identify what is oxidized and what is reduced
in the following processes. b. 2Ce 3Cu2 ? 3Cu
2Ce3 red ox
20
Homework

• 2. Identify what is oxidized and what is reduced
  in the following processes.
• 2Zn O2 ? 2ZnO

21
Homework

• 2. Identify what is oxidized and what is reduced
  in the following processes.
• 2Zn O2 ? 2ZnO
• ox red

22
Homework

• 3. Identify the oxidizing agent and the reducing
  agent in each of the following reactions.
• Mg I2 ? Mg I2

23
Homework
3. Identify the oxidizing agent and the reducing
agent in each of the following reactions. a. Mg
I2 ? Mg I2 red ox
24
Homework

• 3. Identify the oxidizing agent and the reducing
  agent in each of the following reactions.
• 2Na 2H ? 2Na H2

25
Homework
3. Identify the oxidizing agent and the reducing
agent in each of the following reactions. b. 2Na
2H ? 2Na H2 red ox
26
Homework

• 3. Identify the oxidizing agent and the reducing
  agent in each of the following reactions.
• H2S Cl2 ? S 2HCl

27
Homework
3. Identify the oxidizing agent and the reducing
agent in each of the following reactions. c. H2S
Cl2 ? S 2HCl red ox
28
Determining Oxidation Numbers
There are nine rules. You do not have to memorize
them. But you do have to use them.
29
Determining Oxidation Numbers
KClO3
30
Determining Oxidation Numbers
KClO3 O is always -2 (rule 5) K is 1 (rule
7) The sum is zero (rule 8)
31
Determining Oxidation Numbers
KClO3 NK NCl 3(NO) 0 O is always -2 (rule
5) K is 1 (rule 7) The sum is zero (rule 8)
32
Determining Oxidation Numbers
KClO3 1 NCl 3(-2) 0 O is always
-2 (rule 5) K is 1 (rule 7) The sum is zero
(rule 8)
33
Determining Oxidation Numbers
KClO3 NCl 5 O is always -2 (rule 5) K is 1
(rule 7) The sum is zero (rule 8)
34
Determining Oxidation Numbers
SO32- O is always -2 (rule 5) The sum is -2
(rule 9)
35
Determining Oxidation Numbers
SO32- NS 3(NO) -2 O is always -2 (rule
5) The sum is -2 (rule 9)
36
Determining Oxidation Numbers
SO32- NS - 6 -2 O is always -2 (rule 5) The
sum is -2 (rule 9)
37
Determining Oxidation Numbers
SO32- NS 4 O is always -2 (rule 5) The sum is
-2 (rule 9)
38
Try a few on your own
Due at the end of the period Problems 4-9 on
pages 642-643 Homework Problems 10-11 on page
643