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

3. Chemical Reactions

Balancing Chemical Equations

General Chemistry

3. Chemical Reactions

Balancing Chemical Equations

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Multiple Choice

Which of the following is the correctly balanced equation for the reaction between zinc and copper(II) sulfate?

2Zn(s) + CuSO4(aq) -> 2ZnSO4(aq) + Cu(s)

Zn(s) + CuSO4(aq) -> ZnSO4(aq) + Cu(s)

Zn(s) + 2CuSO4(aq) -> ZnSO4(aq) + 2Cu(s)

Zn(s) + CuSO4(aq) -> 2ZnSO4(aq) + Cu(s)

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Verified step by step guidance

Identify the reactants and products in the given chemical reaction. The reactants are zinc (Zn) and copper(II) sulfate (CuSO4), and the products are zinc sulfate (ZnSO4) and copper (Cu).

Write the unbalanced chemical equation: Zn(s) + CuSO4(aq) -> ZnSO4(aq) + Cu(s).

Check the number of atoms of each element on both sides of the equation. For the unbalanced equation, there is 1 Zn, 1 Cu, 1 S, and 4 O atoms on both sides.

Since the number of atoms for each element is already equal on both sides, the equation is balanced as written: Zn(s) + CuSO4(aq) -> ZnSO4(aq) + Cu(s).

Verify that the balanced equation follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. The balanced equation confirms this as the number of each type of atom is the same on both sides.