Daily Quiz. 1.What type of reaction is this? Ca + Br 2 → CaBr 2 a.Synthesis b.Decomposition...
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Transcript of Daily Quiz. 1.What type of reaction is this? Ca + Br 2 → CaBr 2 a.Synthesis b.Decomposition...
Daily Quiz
Daily Quiz1. What type of reaction is this?
Ca + Br2 → CaBr2
a. Synthesis
b. Decomposition
c. Combustion
d. Single replacement
e. Double replacement
Daily Quiz2. To be “happy,” an atom needs all of the following excepta.Equal numbers of + and - charges
b.Equal numbers of neutrons and protons
c.Electron shells are exactly full
Daily Quiz3. When calcium ionizes, its charge becomesa.+1
b.+2
c. -2
d. -1
e. 0
Daily Quiz4. When sodium gives an electron to chlorine, chlorine isa.oxidized
b.reduced
HINT: Remember the lion!
Today we will•Review the homework
•Look at the rules for determining oxidation number
HomeworkQuestions 1-3 on page 640
Homework1. Identify each of the following changes as either oxidation or reduction. Recall that e- is the symbol for an electron.
a.I2 + 2e- → 2I-
Homework1. Identify each of the following changes as either oxidation or reduction. Recall that e- is the symbol for an electron.
a.I2 + 2e- → 2I-
reduction
Homework1. Identify each of the following changes as either oxidation or reduction. Recall that e- is the symbol for an electron.
b. K → K+ + e-
Homework1. 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
Homework1. Identify each of the following changes as either oxidation or reduction. Recall that e- is the symbol for an electron.
c. Fe2+ → Fe3+ + e-
Homework1. 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
Homework1. Identify each of the following changes as either oxidation or reduction. Recall that e- is the symbol for an electron.
d. Ag+ + e- → Ag
Homework1. Identify each of the following changes as either oxidation or reduction. Recall that e- is the symbol for an electron.
d. Ag+ + e- → Agreduction
Homework2. Identify what is oxidized and what is reduced in the following processes.
a. 2Br- + Cl2 → Br2 + 2Cl-
Homework2. Identify what is oxidized and what is reduced in the following processes.
a. 2Br- + Cl2 → Br2 + 2Cl-
ox red
Homework2. Identify what is oxidized and what is reduced in the following processes.
b. 2Ce + 3Cu2+ → 3Cu + 2Ce3+
Homework2. Identify what is oxidized and what is reduced in the following processes.
b. 2Ce + 3Cu2+ → 3Cu + 2Ce3+
red ox
Homework2. Identify what is oxidized and what is reduced in the following processes.
c.2Zn + O2 → 2ZnO
Homework2. Identify what is oxidized and what is reduced in the following processes.
c.2Zn + O2 → 2ZnO
ox red
Homework3. Identify the oxidizing agent and the reducing agent in each of the following reactions.
a.Mg + I2 → Mg I2
Homework3. Identify the oxidizing agent and the reducing agent in each of the following reactions.
a. Mg + I2 → Mg I2
red ox
Homework3. Identify the oxidizing agent and the reducing agent in each of the following reactions.
b.2Na + 2H+ → 2Na+ + H2
Homework3. Identify the oxidizing agent and the reducing agent in each of the following reactions.
b. 2Na + 2H+ → 2Na+ + H2 red ox
Homework3. Identify the oxidizing agent and the reducing agent in each of the following reactions.
c.H2S + Cl2 → S + 2HCl
Homework3. 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
KClO3NK + 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
KClO3NCl = +5
O is always -2 (rule 5)K is +1 (rule 7)The sum is zero (rule 8)
Determining Oxidation Numbers
SO32-
O is always -2 (rule 5)The sum is -2 (rule 9)
Determining Oxidation Numbers
SO32-
NS + 3(NO) = -2
O is always -2 (rule 5)The sum is -2 (rule 9)
Determining Oxidation Numbers
SO32-
NS - 6 = -2
O is always -2 (rule 5)The sum is -2 (rule 9)
Determining Oxidation Numbers
SO32-
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