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

Balancing a chemical equation

is necessary to observe the law of conservation of energy.

involves adding coefficients and changing subscripts.

ensures that the same number of molecules are present in the reactants and products.

results in the same number of atoms of each element are present in reactants and product.

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Verified step by step guidance

Understand the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction. This means the number of atoms of each element must be the same on both sides of the equation.

Identify the reactants and products in the chemical equation. Write down the unbalanced equation with the correct chemical formulas for each reactant and product.

Count the number of atoms of each element present in the reactants and the products. This will help you determine which elements need to be balanced.

Add coefficients in front of the chemical formulas to balance the number of atoms of each element on both sides of the equation. Remember, you can only change the coefficients, not the subscripts in the chemical formulas.

Check your work by recounting the atoms of each element on both sides of the equation to ensure they are equal. Adjust the coefficients as necessary to achieve a balanced equation.