Table 4.3 Rules for Assigning an Oxidation Number (O.N.) Flashcards Preview

Chem 1410 - UNT > Table 4.3 Rules for Assigning an Oxidation Number (O.N.) > Flashcards

Flashcards in Table 4.3 Rules for Assigning an Oxidation Number (O.N.) Deck (20):
1

Which of the diatomics are not a gas?

Br I

2

General Rule #2: For a monatomic ion: O.N. = ______ (with the sign *before* the numeral)

Ion charge

3

What is the oxidation number of Arsenic in H3AsO4?

Solution:

* Sum of the oxidation numbers for H3AsO4= 0

* Oxidation numbers equation: (+1) * 3 + (x) * 1 + (-2) * 4 = 0

* Thus, x = 5 = oxidation number of Arsenic (As).

4

Determine the O.N. for HNO3.

* O.N. for H: +1

* O.N. for NO3: -1

* O.N. for N: +5

* O.N. for each O: -2 

 

5

Rules for Specific Atoms or Periodic Table Groups: #5: For oxygen: * O.N. = -1 in _____ ; O.N. = -2 in ____ other compounds (except with F); O.N. =+2 in ___.

Peroxides. All. F.

6

What are the N Cl H O F?

Diatomics that are a gas?

7

General Rule #3: A. The sum of O.N. values for the atoms in a molecule or formula unit of a compound equals ____. B. The sum of the O.N. values for the atoms in a polyatomic ion equals the _____________.

A. 0 B. Ion's charge.

8

Rules for Specific Atoms or Periodic Table Groups: #4: For fluorine: O.N. = -1 in ____ compounds

All

9

What are all the diatomics in the periodic table?

Br  I  N Cl H O F

10

Rules for Specific Atoms or Periodic Table Groups: #2. For Group 2A(2): O.N.=______________

The O.N.=+2 in all compounds

11

Rules for Specific Atoms or Periodic Table Groups: #6 For Group 7A(17): O.N. = -1 in combination with ______, ______ (except __) and other ______ lower in the group.

Metals. Nonmetals. O. Halogens.

12

Rules for Specific Atoms or Periodic Table Groups: #3. For hydrogen: * O.N. = ___ * O.N. = ___

O.N. = +1 in combination with nonmetals; O.N. = -1 in combination with metals and boron.

13

Determine the oxidation number (O.N.) of the element in the following species:

Zinc Chloride

Solution: 

* Sum of O.N. of ZnCl2 =0

* O.N. of Zn2+ ion = +2

* O.N. of Cl- ion = -1

14

Which of the diatomics are a gas?

N Cl H O F

15

Determine the oxidation number of each element in Cr2O7_2-.

* Sum of the oxidation numbers = -2

* The total O.N. for seven O atoms = -14

* Thus, x * 2 + (-14) = -2. 

* x = 6 = O.N. for each Cr.

16

Determine the O.N. for hydrogen phosphate ion.

O.N. for H: +1

O.N. for PO4: -3

O.N. for each O: -2

O.N. for P: +5

 

17

Rules for Specific Atoms or Periodic Table Groups: #1. For Group 1A(1): O.N. = ______________

The O.N. = +1 in all compounds

18

What is Br I N Cl H O F?

Diatomics in the periodic table.

19

What is Br I?

Diamtomics that are not a gas

20

General Rule #1: For an atom in its elemental form (Na, O2, Cl2, etc.): O.N. = ___

0