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

6. Chemical Quantities & Aqueous Reactions

Molecular Equations

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Molecular Equations

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Multiple Choice

Which of the following is the correct molecular equation for the reaction between sodium chloride and sodium carbonate in aqueous solution?

2 NaCl(aq) + Na2CO3(aq) → 2 Na2CO3(aq) + Cl2(g)

2 NaCl(aq) + Na2CO3(aq) → 2 Na+(aq) + CO3^2-(aq) + 2 Cl-(aq)

NaCl(aq) + Na2CO3(aq) → Na2Cl2(aq) + CO2(g)

2 NaCl(aq) + Na2CO3(aq) → 2 Na+(aq) + 2 Cl-(aq) + Na2CO3(aq)

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Verified step by step guidance

Identify the reactants and products in the given chemical reaction. The reactants are sodium chloride (NaCl) and sodium carbonate (Na2CO3), both in aqueous solution.

Understand that in aqueous solutions, ionic compounds dissociate into their respective ions. Sodium chloride dissociates into Na+ and Cl- ions, while sodium carbonate dissociates into Na+ and CO3^2- ions.

Write the dissociation equations for each compound: NaCl(aq) → Na+(aq) + Cl-(aq) and Na2CO3(aq) → 2 Na+(aq) + CO3^2-(aq).

Combine the dissociated ions from the reactants to form the complete ionic equation. Since Na+ ions are common in both reactants, they remain unchanged, and Cl- ions from NaCl are also present.

The correct molecular equation should reflect the dissociation of the reactants into their ions without forming new compounds or gases. Therefore, the correct equation is: 2 NaCl(aq) + Na2CO3(aq) → 2 Na+(aq) + 2 Cl-(aq) + Na2CO3(aq).