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

Balance the following equation: K2CrO4(aq) + Na2SO3(aq) + HCl(aq) → KCl(aq) + Na2SO4(aq) + CrCl3(aq) + H2O(l). What are the correct coefficients for K2CrO4, Na2SO3, and HCl, respectively?

2, 3, 6

1, 3, 8

2, 1, 8

1, 2, 6

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Verified step by step guidance

Identify the number of atoms of each element in the reactants and products. Write down the unbalanced equation: K2CrO4(aq) + Na2SO3(aq) + HCl(aq) → KCl(aq) + Na2SO4(aq) + CrCl3(aq) + H2O(l).

Start by balancing the elements that appear in only one compound on each side. Begin with chromium (Cr) and potassium (K) from K2CrO4. Since Cr appears in CrCl3, balance Cr by ensuring there are equal numbers of Cr atoms on both sides.

Next, balance the sodium (Na) atoms. Na appears in Na2SO3 and Na2SO4. Adjust the coefficients to ensure the number of Na atoms is equal on both sides.

Balance the chlorine (Cl) atoms. Cl appears in HCl, KCl, and CrCl3. Adjust the coefficients to ensure the number of Cl atoms is equal on both sides.

Finally, balance the hydrogen (H) and oxygen (O) atoms. H appears in HCl and H2O, and O appears in K2CrO4, Na2SO3, and H2O. Adjust the coefficients to ensure the number of H and O atoms is equal on both sides.