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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

When is a Roman numeral most likely needed in the name of an ionic compound?

When the nonmetal is present in excess

When the metal is from Group 1 or Group 2 of the periodic table

When the compound contains a polyatomic ion

When the metal can form more than one possible positive charge (oxidation state)

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Verified step by step guidance

Understand that Roman numerals in the names of ionic compounds indicate the oxidation state (charge) of the metal cation in the compound.

Recognize that metals from Group 1 and Group 2 of the periodic table have fixed charges (+1 and +2 respectively), so Roman numerals are not needed for these metals.

Know that nonmetals do not use Roman numerals in naming ionic compounds because they typically form anions with a fixed charge.

Identify that polyatomic ions have fixed charges and their names do not require Roman numerals either.

Conclude that Roman numerals are necessary when the metal can have more than one possible positive charge (oxidation state), to specify which charge is present in the compound.