Subjects
| Sections | |||
|---|---|---|---|
| Molarity | 23 mins | 0 completed | Learn Summary |
| Normality & Equivalent Weight | 24 mins | 0 completed | Learn Summary |
| Solution Stoichiometry | 22 mins | 0 completed | Learn |
| Solubility Rules | 7 mins | 0 completed | Learn Summary |
| Net Ionic Equations | 21 mins | 0 completed | Learn Summary |
| Electrolytes | 19 mins | 0 completed | Learn Summary |
| Balancing Redox Reactions | 22 mins | 0 completed | Learn |
| Activity Series | 19 mins | 0 completed | Learn |
| End of Chapter 4 Problems | 46 mins | 0 completed | Learn |
| Additional Practice |
|---|
| Redox Reactions |
| Calculate Oxidation Number |
| Additional Guides |
|---|
| Dilution |
| Net Ionic Equation |
| Oxidation Reduction (Redox) Reactions |
| Oxidation Number |
| Types of Chemical Reactions |
What is the oxidation number of the chromium atom in Na2CrO4 ?
A) +7
B) +6
C) -2
D) +2
We’re being asked to determine the oxidation state of Cr in Na2CrO4
The rules for oxidation states are as follows:
A. General Rules:
1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.) O.S. = 0
2. For an ion (Li+, Al3+, etc.) O.S. = charge
Enter your friends' email addresses to invite them:
Join thousands of students and gain free access to 46 hours of Chemistry videos that follow the topics your textbook covers.