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

What is the correct sequence of coefficients when the equation CS2(l) + O2(g) → CO2(g) + SO2(g) is balanced?

1, 1, 1, 1

1, 3, 1, 2

1, 2, 1, 3

2, 3, 2, 2

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Verified step by step guidance

Start by identifying the number of atoms of each element in the reactants and products. For the equation CS2(l) + O2(g) → CO2(g) + SO2(g), count the atoms: Carbon (C), Sulfur (S), and Oxygen (O).

Write down the initial unbalanced equation: CS2(l) + O2(g) → CO2(g) + SO2(g). Note that there is 1 C atom, 2 S atoms, and 2 O atoms in CS2, and O2 has 2 O atoms.

Balance the carbon atoms first. Since there is 1 C atom in CS2 and 1 C atom in CO2, the carbon is already balanced.

Next, balance the sulfur atoms. There are 2 S atoms in CS2, so you need 2 SO2 molecules to have 2 S atoms on the product side. This gives the partial equation: CS2(l) + O2(g) → CO2(g) + 2 SO2(g).

Finally, balance the oxygen atoms. There are 4 O atoms needed on the product side (2 from CO2 and 4 from 2 SO2, totaling 6 O atoms). Therefore, you need 3 O2 molecules to provide 6 O atoms. The balanced equation is: CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g).