Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

6. Chemical Quantities & Aqueous Reactions

Calculate Oxidation Numbers

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Calculate Oxidation Numbers

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Multiple Choice

What is the oxidation number of manganese in MnO2?

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Verified step by step guidance

Understand that the oxidation number is a concept used to describe the degree of oxidation of an atom in a chemical compound. It is often used to determine how electrons are distributed among atoms in a molecule.

Recognize that in MnO2, manganese (Mn) is combined with oxygen (O). Oxygen typically has an oxidation number of -2.

Set up an equation to find the oxidation number of manganese. Let the oxidation number of Mn be x. Since there are two oxygen atoms, their total contribution to the oxidation number is 2 * (-2) = -4.

Write the equation based on the fact that the sum of oxidation numbers in a neutral compound is zero: x + (-4) = 0.

Solve the equation for x to find the oxidation number of manganese: x = 4.