Transcript Wednesday, September 5

Daily Quiz
Daily Quiz
1.
What type of reaction is this?
Ca + Br2 → CaBr2
a.
b.
c.
d.
e.
Synthesis
Decomposition
Combustion
Single replacement
Double replacement
Daily Quiz
2. To be “happy,” an atom needs all of
the following except
a. Equal numbers of + and - charges
b. Equal numbers of neutrons and protons
c. Electron shells are exactly full
Daily Quiz
3. When calcium ionizes, its charge
becomes
a. +1
b. +2
c. -2
d. -1
e. 0
Daily Quiz
4. When sodium gives an electron to
chlorine, chlorine is
a. oxidized
b. reduced
HINT: Remember the lion!
Today we will
•Review the homework
•Look at the rules for determining
oxidation number
Homework
Questions 1-3 on page 640
Homework
1. Identify each of the following changes
as either oxidation or reduction. Recall
that e- is the symbol for an electron.
a. I2 +
2e
→
2I
Homework
1. Identify each of the following changes
as either oxidation or reduction. Recall
that e- is the symbol for an electron.
2e
a. I2 +
→
reduction
2I
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
Homework
1. Identify each of the following changes
as either oxidation or reduction. Recall
that e- is the symbol for an electron.
+
K
b. K →
+
oxidation
e
Homework
1. Identify each of the following changes
as either oxidation or reduction. Recall
that e- is the symbol for an electron.
c.
2+
Fe →
3+
Fe
+
e
Homework
1. Identify each of the following changes
as either oxidation or reduction. Recall
that e- is the symbol for an electron.
c.
2+
Fe →
3+
Fe
oxidation
+
e
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
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
Homework
2. Identify what is oxidized and what is
reduced in the following processes.
a.
2Br
+ Cl2 → Br2 +
2Cl
Homework
2. Identify what is oxidized and what is
reduced in the following processes.
a.
2Br
2Cl
+ Cl2 → Br2 +
ox red
Homework
2. Identify what is oxidized and what is
reduced in the following processes.
b. 2Ce +
2+
3Cu →
3Cu +
3+
2Ce
Homework
2. Identify what is oxidized and what is
reduced in the following processes.
b. 2Ce +
2+
3Cu →
3Cu +
red
3+
2Ce
ox
Homework
2. Identify what is oxidized and what is
reduced in the following processes.
c. 2Zn + O2 → 2ZnO
Homework
2. Identify what is oxidized and what is
reduced in the following processes.
c. 2Zn + O2 → 2ZnO
ox red
Homework
3. Identify the oxidizing agent and the
reducing agent in each of the following
reactions.
a. Mg + I2 → Mg I2
Homework
3. Identify the oxidizing agent and the
reducing agent in each of the following
reactions.
a. Mg + I2 → Mg I2
red ox
Homework
3. Identify the oxidizing agent and the
reducing agent in each of the following
reactions.
b. 2Na +
+
2H →
+
2Na
+ H2
Homework
3. Identify the oxidizing agent and the
reducing agent in each of the following
reactions.
+
2H →
b. 2Na +
red ox
+
2Na
+ H2
Homework
3. Identify the oxidizing agent and the
reducing agent in each of the following
reactions.
c. H2S + Cl2 → S + 2HCl
Homework
3. Identify the oxidizing agent and the
reducing agent in each of the following
reactions.
c. H2S + Cl2 → S + 2HCl
red ox
Determining Oxidation Numbers
There are nine rules.
You do not have to memorize them.
But you do have to use them.
Determining Oxidation Numbers
KClO3
Determining Oxidation Numbers
KClO3
O is always -2 (rule 5)
K is +1 (rule 7)
The sum is zero (rule 8)
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)
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)
Determining Oxidation Numbers
KClO3
NCl = +5
O is always -2 (rule 5)
K is +1 (rule 7)
The sum is zero (rule 8)
Determining Oxidation Numbers
SO3
2-
O is always -2 (rule 5)
The sum is -2 (rule 9)
Determining Oxidation Numbers
SO3
2-
NS + 3(NO) = -2
O is always -2 (rule 5)
The sum is -2 (rule 9)
Determining Oxidation Numbers
SO3
2-
NS - 6 = -2
O is always -2 (rule 5)
The sum is -2 (rule 9)
Determining Oxidation Numbers
SO3
2-
NS = +4
O is always -2 (rule 5)
The sum is -2 (rule 9)
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