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

3. Chemical Reactions

Naming Ionic Compounds

General Chemistry

3. Chemical Reactions

Naming Ionic Compounds

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Multiple Choice

Which of the following formulas represents chromium(III) oxide?

Cr3O2

Cr2O3

CrO

CrO3

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Verified step by step guidance

Step 1: Identify the oxidation state of chromium in chromium(III) oxide. The Roman numeral III indicates that chromium has a +3 charge (Cr^{3+}).

Step 2: Determine the charge on the oxide ion. Oxygen typically forms an oxide ion with a charge of -2 (O^{2-}).

Step 3: Use the crisscross method to balance the charges between chromium and oxide ions. Since chromium is +3 and oxide is -2, the formula must balance the total positive and negative charges.

Step 4: Cross the charges to become subscripts for the other ion: chromium's charge (3) becomes the subscript for oxygen, and oxygen's charge (2) becomes the subscript for chromium, giving the formula Cr_{2}O_{3}.

Step 5: Verify that the total positive charge equals the total negative charge: 2 chromium ions × +3 = +6 and 3 oxide ions × -2 = -6, so the compound is electrically neutral.