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

Physical & Chemical Changes

General Chemistry

1. Intro to General Chemistry

Physical & Chemical Changes

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Multiple Choice

In the context of physical and chemical changes, when does a chemical transformation occur?

When a substance is mixed with another but retains its original properties.

When a substance is heated and expands.

When a substance changes its state, such as from solid to liquid.

When a substance undergoes a change in its chemical composition.

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Verified step by step guidance

Understand the difference between physical and chemical changes: A physical change involves a change in physical properties without altering the chemical composition, while a chemical change results in the formation of new substances with different chemical properties.

Identify the characteristics of a chemical change: Look for signs such as color change, gas production, formation of a precipitate, or energy change (heat, light, etc.).

Evaluate the given scenarios: Determine if the substance's chemical composition is altered in each case.

Analyze the first scenario: Mixing substances without changing their original properties is a physical change, not a chemical transformation.

Conclude with the correct scenario: A chemical transformation occurs when there is a change in the chemical composition of a substance, resulting in new substances being formed.