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 the difference between a pure substance and a mixture?

A pure substance can be separated into its components by physical means, while a mixture cannot be separated.

A pure substance always consists of two or more elements, while a mixture contains only one element.

A pure substance has a fixed composition and distinct properties, while a mixture contains two or more substances physically combined and can have variable composition.

A pure substance is always a solid, while a mixture can be a liquid or gas.

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Verified step by step guidance

Step 1: Understand the definition of a pure substance. A pure substance has a fixed, definite composition and distinct chemical and physical properties. It can be either an element or a compound.

Step 2: Understand the definition of a mixture. A mixture consists of two or more substances physically combined, and its composition can vary. The components retain their individual properties and can be separated by physical means.

Step 3: Analyze the options given in the problem. Identify which statements correctly describe the characteristics of pure substances and mixtures based on their composition and separability.

Step 4: Recognize that pure substances cannot be separated into components by physical means, whereas mixtures can be separated physically (e.g., filtration, distillation).

Step 5: Conclude that the best description is that a pure substance has a fixed composition and distinct properties, while a mixture contains two or more substances physically combined and can have variable composition.