Name _________________________________________ Date ________________ Class_____________
Spring Break Packet: Determining Oxidation Numbers
I. Fill in the following (blank lines) from your notes
1. Neutral elements are always __________
2. In a compound:
Group 1 metals _____
Ex: Li2O
Group 2 metals _____
Ex: MgCl2
CaH2
3. In a compound,
Hydrogen: usually ____________
Ex: HCl
Except when combined with Group I or II metals: _________
Oxygen: usually ____________
ex: KH
Ex: Na2O
Except, sometimes when combined with Group I or Group II elements, can be ______
Peroxide form of oxygen
Ex: Na2O2
4. Total of Oxidation states when multiplied by the number of each element will add up to the
______________ on the compound
II. For each of the following, determine the oxidation number for each element:
1. P
2. Br2
3.Cu+2
4. NaHCO3
5. CsH
6. Na2O
7. Na2O2
8. HSO4-
9. BeO
10. P2O5
Name _________________________________________ Date ________________
Class_____________
Answer the questions below referring to the above diagram.
1.
Which is more easily oxidized, metal, aluminum, or lead? Explain how you know.
2.
What is the balanced equation showing the spontaneous reaction that occurs?
3.
What is the direction of electron flow in the wire?
4.
What is the direction of positive ion flow in the salt bridge?
5.
Which electrode is decreasing in size?
6.
Which electrode is increasing in size?
7.
What is happening to the concentration of aluminum ions?
8.
What is happening to the concentration of lead ions?
9.
Which is the anode?
10.
Which is the cathode?
11.
What is the positive electrode?
12.
What is the negative electrode?
13.
What would need to change for this to become an electrolytic battery?