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 pure substance in the classification of matter?

A combination of two or more substances that retain their individual properties

A mixture of different elements and compounds

A solution that can be separated by physical means

A material composed of only one type of atom or molecule

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Verified step by step guidance

Understand the definition of a pure substance: A pure substance is composed of only one type of atom or molecule, meaning it has a uniform and definite composition.

Differentiate between pure substances and mixtures: Mixtures consist of two or more substances that retain their individual properties and can be separated by physical means, whereas pure substances cannot be separated into other substances by physical means.

Identify examples of pure substances: Elements like gold (Au) and compounds like water (H₂O) are pure substances because they consist of only one type of atom or molecule.

Recognize the characteristics of pure substances: Pure substances have consistent properties throughout, such as melting point, boiling point, and density, which do not change regardless of the sample size.

Apply the concept to the given options: Evaluate each option based on the definition of a pure substance. The correct answer is the one that describes a material composed of only one type of atom or molecule.