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

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 compounds requires a Roman numeral in its name?

MgO

K_2SO_4

NaCl

FeCl_2

Previous problemNext problem

Verified step by step guidance

Understand that Roman numerals in chemical names are used to indicate the oxidation state of transition metals or elements that can have multiple oxidation states.

Identify which elements in the given compounds are metals that commonly exhibit variable oxidation states. For example, Mg (magnesium), K (potassium), and Na (sodium) are alkali or alkaline earth metals with fixed oxidation states, so they do not require Roman numerals.

Recognize that Fe (iron) is a transition metal that can have multiple oxidation states, such as +2 and +3, so its compounds often require Roman numerals to specify the oxidation state.

Look at the compound FeCl_2: since iron can have more than one oxidation state, the name must include a Roman numeral to indicate the specific charge on iron in this compound.

Conclude that among the given options, only FeCl_2 requires a Roman numeral in its name because it contains a transition metal with variable oxidation states.