Questions and Answers

- 1.
### What is the oxidation number on N in Li

_{3}N?Explanation

Rule

2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3.

Li is in group 1, N needs to be -3 to balance.Rate this question:

- 2.
### What is the oxidation number on N in N

_{2}O_{5}?Explanation

Rule

2g. Oxygen in a compound is -2.

Grand total oxygen equals -10. Nitrogen has to be +10 to balance, but there are two of them. Each one needs to be +5Rate this question:

- 3.
### What is the oxidation number on Hydrogen?

Explanation

Rule

2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3.Rate this question:

- 4.
### What is the oxidation number on N in HNO

_{3}?Explanation

Rule

2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3. (H= +1)

2g. Oxygen in a compound is -2.

Separate out the poly atomic NO3 and its charge is -1

Oxygen grand total is -6 so nitrogen needs to be +6 but the -1 charge brings it down to +5Rate this question:

- 5.
### What is the oxidation number for Cu in CuSO

_{4}?Explanation

SO4 is a polyatomic with a -2 charge. Cu must have a +2 to balanceRate this question:

- 6.
### What is the oxidation number for I

_{2}?Explanation

Rule

2a. Any uncombined, single atoms or diatomics are always zero.Rate this question:

- 7.
### What is the oxidation number for Mn in MnCl

_{2}?Explanation

Rule

2d. The most electronegative will have an oxidation number equal to its charge as an ion. (highest E.N. is in the upper right)Rate this question:

- 8.
### What is the oxidation number on Cr

^{4+}?Explanation

Rule

2b. The oxidation number of an ion is its charge.Rate this question:

- 9.
### What is the oxidation number on F in IF

_{7}?Explanation

Rule

2c. In a compound Fluorine is always -1.Rate this question:

- 10.
### The sum of all oxidation numbers must equal?

Explanation

Rule

3a. The sum of all oxidation numbers must equal zero.Rate this question:

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