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

Identify the correct balanced equation and net ionic equation for the reaction between aqueous hydrochloric acid (HCl) and solid calcium carbonate (CaCO3).

Balanced equation: 2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l); Net ionic equation: 2H+(aq) + CaCO3(s) → Ca^2+(aq) + CO2(g) + H2O(l)

Balanced equation: 2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l); Net ionic equation: H+(aq) + CaCO3(s) → Ca^2+(aq) + CO2(g) + H2O(l)

Balanced equation: 2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l); Net ionic equation: 2H+(aq) + CO3^2-(s) → CO2(g) + H2O(l)

Balanced equation: HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l); Net ionic equation: H+(aq) + CO3^2-(s) → CO2(g) + H2O(l)

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Verified step by step guidance

Step 1: Begin by writing the chemical formulas for the reactants and products involved in the reaction. The reactants are hydrochloric acid (HCl) and calcium carbonate (CaCO3), and the products are calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O).

Step 2: Write the unbalanced chemical equation using the formulas from Step 1: HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l).

Step 3: Balance the chemical equation by ensuring the number of atoms of each element is the same on both sides of the equation. Start by balancing the number of H atoms by placing a coefficient of 2 in front of HCl: 2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l).

Step 4: Identify the ions involved in the reaction to write the net ionic equation. Hydrochloric acid dissociates into H+ and Cl- ions in solution, and calcium carbonate is a solid that dissociates into Ca^2+ and CO3^2- ions. The net ionic equation focuses on the ions that participate in the reaction: 2H+(aq) + CaCO3(s) → Ca^2+(aq) + CO2(g) + H2O(l).

Step 5: Verify the net ionic equation by ensuring that it includes only the ions and molecules directly involved in the chemical change, excluding spectator ions. In this case, Cl- ions are spectator ions and do not appear in the net ionic equation.