Table of contents

Skip topic navigation

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

Previous problemNext problem

Struggling with General Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following is the correct chemical formula for copper(II) oxide?

CuO

Cu2O3

CuO2

Cu2O

Previous problemNext problem

Verified step by step guidance

Identify the oxidation state of copper in copper(II) oxide. The Roman numeral II indicates that copper has a +2 charge (Cu^{2+}).

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

Combine the ions in a ratio that results in a neutral compound. Since Cu^{2+} and O^{2-} have charges of equal magnitude but opposite sign, they combine in a 1:1 ratio.

Write the chemical formula by placing the symbols of copper and oxygen with their respective subscripts reflecting the ratio. Since the ratio is 1:1, the formula is CuO.

Verify that the total positive charge balances the total negative charge to confirm the formula is electrically neutral.