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 best describes a compound, and which pair of substances are examples of compounds?

A compound is a pure substance made of two or more elements chemically combined; examples include H2O and NaCl.

A compound is a mixture of two or more substances physically blended; examples include air and brass.

A compound is a heterogeneous mixture; examples include sand and water.

A compound is a single element in its pure form; examples include O2 and Fe.

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Verified step by step guidance

Step 1: Understand the definition of a compound in chemistry. A compound is a pure substance formed when two or more different elements are chemically combined in fixed proportions.

Step 2: Differentiate compounds from mixtures. Mixtures are physical blends of substances that can be separated by physical means, whereas compounds involve chemical bonds between elements.

Step 3: Identify examples of compounds by looking for substances composed of two or more elements chemically bonded. For example, H2O (water) consists of hydrogen and oxygen atoms chemically bonded, and NaCl (table salt) consists of sodium and chlorine atoms chemically bonded.

Step 4: Recognize that substances like air and brass are mixtures, not compounds, because their components are physically blended and not chemically bonded.

Step 5: Conclude that the best description of a compound is a pure substance made of two or more elements chemically combined, with examples such as H2O and NaCl.