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

Empirical Formula

General Chemistry

3. Chemical Reactions

Empirical Formula

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Multiple Choice

Which of the following methods can be used to determine the empirical formula of zinc oxide?

Mixing zinc with sulfuric acid and measuring the temperature change

Dissolving zinc in water and measuring the pH change

Heating zinc in a vacuum and measuring the volume change

Combining zinc with oxygen and measuring the mass change

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Verified step by step guidance

Understand that the empirical formula represents the simplest whole-number ratio of elements in a compound. For zinc oxide, we need to determine the ratio of zinc (Zn) to oxygen (O) in the compound.

Recognize that the empirical formula can be determined by measuring the mass of each element in the compound. In this case, we need to measure the mass of zinc and the mass of oxygen that combine to form zinc oxide.

Consider the method of combining zinc with oxygen and measuring the mass change. This involves heating zinc in the presence of oxygen and measuring the mass before and after the reaction to determine how much oxygen has combined with the zinc.

Calculate the mass of oxygen that has reacted by subtracting the initial mass of zinc from the final mass of the zinc oxide product. This gives the mass of oxygen that has combined with the zinc.

Use the masses of zinc and oxygen to calculate the mole ratio. Convert the masses to moles using the molar masses of zinc and oxygen, and then determine the simplest whole-number ratio to find the empirical formula of zinc oxide.