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 statement best describes how chemical formulas for pure substances differ from those for mixtures?

Pure substances and mixtures both use chemical formulas to show the physical state of their components.

Mixtures have chemical formulas that indicate the ratio of their components, while pure substances do not have chemical formulas.

Both pure substances and mixtures have fixed chemical formulas that represent their exact composition.

Pure substances have fixed chemical formulas representing definite compositions, while mixtures do not have chemical formulas because their composition can vary.

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Verified step by step guidance

Understand the definition of a pure substance: it is a material with a fixed, definite composition and distinct chemical formula representing the exact ratio of atoms in the compound.

Recognize that mixtures are combinations of two or more substances where the components retain their individual properties and the composition can vary; therefore, mixtures do not have a fixed chemical formula.

Recall that chemical formulas represent the types and numbers of atoms in a molecule or compound, which applies only to pure substances with definite compositions.

Note that mixtures are described by the names or formulas of their individual components, but not by a single chemical formula because their proportions are not fixed.

Conclude that the key difference is that pure substances have fixed chemical formulas indicating definite composition, whereas mixtures lack such formulas due to variable composition.