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

Which one of the following represents a chemical change?

Boiling of water

Melting of ice

Rusting of iron

Breaking of glass

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Verified step by step guidance

Understand the concept of a chemical change: A chemical change involves a process where substances are transformed into different substances with new chemical properties. This is different from a physical change, which only affects the form of a substance, not its chemical identity.

Identify the characteristics of a chemical change: Look for signs such as the formation of a new substance, change in color, production of gas, or release/absorption of energy.

Examine each option: Boiling of water and melting of ice are physical changes because they involve changes in state but do not produce new substances. Breaking of glass is also a physical change as it involves a change in shape or form.

Consider rusting of iron: Rusting is a chemical change because iron reacts with oxygen in the presence of moisture to form iron oxide, a new substance with different properties from iron.

Conclude that rusting of iron is the correct answer: It represents a chemical change due to the formation of a new substance, iron oxide, through a chemical reaction.