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 balanced chemical equation for the reaction between aqueous barium chloride and aqueous sodium phosphate to form solid barium phosphate and aqueous sodium chloride?

BaCl2(aq) + Na3PO4(aq) → Ba3(PO4)2(s) + NaCl(aq)

3BaCl2(aq) + 2Na3PO4(aq) → Ba3(PO4)2(s) + 6NaCl(aq)

3BaCl2(aq) + Na3PO4(aq) → Ba3(PO4)2(s) + 3NaCl(aq)

2BaCl2(aq) + 3Na3PO4(aq) → 2Ba3(PO4)2(s) + 6NaCl(aq)

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Verified step by step guidance

Identify the reactants and products in the chemical equation: Barium chloride (BaCl₂) and sodium phosphate (Na₃PO₄) are the reactants, while barium phosphate (Ba₃(PO₄)₂) and sodium chloride (NaCl) are the products.

Write the unbalanced chemical equation: BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq).

Balance the barium atoms: Since there are 3 barium atoms in Ba₃(PO₄)₂, you need 3 BaCl₂ molecules. Update the equation to 3BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq).

Balance the phosphate ions: There are 2 phosphate ions in Ba₃(PO₄)₂, so you need 2 Na₃PO₄ molecules. Update the equation to 3BaCl₂(aq) + 2Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq).

Balance the sodium and chloride ions: There are 6 sodium ions and 6 chloride ions needed to balance the equation, so you need 6 NaCl molecules. The balanced equation is 3BaCl₂(aq) + 2Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6NaCl(aq).