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

9. Quantum Mechanics

Bohr Model

General Chemistry

9. Quantum Mechanics

Bohr Model

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Multiple Choice

According to the Bohr model, which of the following statements is true about the energy levels of a hydrogen atom?

A hydrogen atom in the n = 2 state is at a lower energy than one in the n = 1 state.

The energy of a hydrogen atom is the same in all states.

A hydrogen atom in the n = 1 state is at a higher energy than one in the n = 3 state.

A hydrogen atom in the n = 3 state is at a higher energy than one in the n = 1 state.

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Verified step by step guidance

Understand the Bohr model: The Bohr model describes the hydrogen atom as having electrons in circular orbits around the nucleus, with each orbit corresponding to a specific energy level denoted by the principal quantum number n.

Recognize the energy level relationship: In the Bohr model, the energy of an electron in a hydrogen atom is quantized and depends on the principal quantum number n. The energy levels are given by the formula: E_n = -13.6 eV / n^2, where E_n is the energy of the level and n is the principal quantum number.

Analyze the energy level formula: Notice that as n increases, the magnitude of the energy (which is negative) decreases, meaning the energy becomes less negative and thus higher. Therefore, higher n values correspond to higher energy levels.

Evaluate the given statements: Compare the energy levels for different n values using the formula. For example, n = 1 has a lower energy (more negative) than n = 3, which means n = 3 is at a higher energy level than n = 1.

Identify the correct statement: Based on the analysis, the correct statement is that a hydrogen atom in the n = 3 state is at a higher energy than one in the n = 1 state, aligning with the energy level formula and the Bohr model's predictions.