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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

What is the molecular equation for the precipitation reaction that occurs when aqueous solutions of potassium carbonate and zinc nitrate are mixed?

NO REACTION

K2CO3(aq) + Zn(NO3)2(aq) → 2KNO3(aq) + CO2(g) + ZnO(s)

K2CO3(aq) + Zn(NO3)2(aq) → ZnCO3(s) + 2KNO3(aq)

K2CO3(aq) + Zn(NO3)2(aq) → 2KNO3(aq) + Zn(s) + CO2(g)

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Verified step by step guidance

Identify the reactants in the given problem: Potassium carbonate (K2CO3) and zinc nitrate (Zn(NO3)2). Both are in aqueous solutions.

Determine the possible products by exchanging the ions of the reactants. Potassium (K+) will pair with nitrate (NO3-) and zinc (Zn2+) will pair with carbonate (CO3^2-).

Write the potential products: Potassium nitrate (KNO3) and zinc carbonate (ZnCO3).

Check the solubility of the products in water. Potassium nitrate is soluble, while zinc carbonate is insoluble, indicating a precipitation reaction.

Write the balanced molecular equation for the reaction: K2CO3(aq) + Zn(NO3)2(aq) → ZnCO3(s) + 2KNO3(aq). This shows the formation of the insoluble zinc carbonate as a precipitate.