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

1. Intro to General Chemistry

Classification of Matter

General Chemistry

1. Intro to General Chemistry

Classification of Matter

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Multiple Choice

Which of the following is NOT an example of a molecule?

CO2

NaCl

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Verified step by step guidance

Step 1: Understand the definition of a molecule. A molecule is formed when two or more atoms are chemically bonded together. These atoms can be of the same element or different elements.

Step 2: Analyze each option to determine if it is a molecule. For example, $\mathrm{CO_2}$ consists of one carbon atom bonded to two oxygen atoms, so it is a molecule.

Step 3: Check $\mathrm{O_2}$, which consists of two oxygen atoms bonded together, making it a molecule as well.

Step 4: Consider $\mathrm{NaCl}$, which is composed of sodium and chlorine atoms bonded ionically. Although it forms a compound, it is often considered a formula unit rather than a molecule because it forms a lattice structure, but for many contexts, it is treated as a molecule-like entity.

Step 5: Look at helium (He), which is a noble gas existing as single atoms, not bonded to other atoms. Therefore, it is not a molecule but a monoatomic element.