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 of the following statements about the changes food undergoes during cooking is correct?

Cooking food is a chemical change because it only changes the temperature.

Cooking food is a chemical change because it changes the chemical composition.

Cooking food is a physical change because it involves a change in state.

Cooking food is a physical change because it alters the appearance.

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Verified step by step guidance

Understand the difference between physical and chemical changes: A physical change involves a change in the state or appearance of a substance without altering its chemical composition, while a chemical change involves a transformation that alters the chemical composition of the substance.

Consider the process of cooking food: Cooking often involves heat, which can cause chemical reactions that change the food's chemical structure, such as the breakdown of proteins or the caramelization of sugars.

Evaluate the statement 'Cooking food is a chemical change because it changes the chemical composition': This statement is correct because cooking typically results in new substances being formed, indicating a chemical change.

Analyze the statement 'Cooking food is a physical change because it involves a change in state': While cooking can involve changes in state (e.g., water boiling), the primary change is chemical due to the alteration of the food's chemical makeup.

Reflect on the statement 'Cooking food is a physical change because it alters the appearance': Although cooking changes the appearance, the key aspect is the chemical transformation, making it a chemical change.