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

8. Thermochemistry

Endothermic & Exothermic Reactions

General Chemistry

8. Thermochemistry

Endothermic & Exothermic Reactions

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Multiple Choice

Calculate the total amount of heat needed, in joules, to convert 75.0 grams of ice at -20°C to steam at 100°C. Given: the heat of fusion of water is 6.01 kJ/mol, the heat of vaporization is 40.7 kJ/mol, and the specific heats are: ice = 2.09 J/g°C, water = 4.18 J/g°C, steam = 2.00 J/g°C.

120,000 J

54,000 J

75,000 J

90,000 J

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Verified step by step guidance

Calculate the heat required to warm the ice from -20°C to 0°C using the formula: \( q = m \cdot c \cdot \Delta T \), where \( m \) is the mass, \( c \) is the specific heat of ice, and \( \Delta T \) is the change in temperature.

Calculate the heat required to melt the ice at 0°C to water using the formula: \( q = n \cdot \Delta H_{fusion} \), where \( n \) is the number of moles of water and \( \Delta H_{fusion} \) is the heat of fusion.

Calculate the heat required to warm the water from 0°C to 100°C using the formula: \( q = m \cdot c \cdot \Delta T \), where \( c \) is the specific heat of water.

Calculate the heat required to vaporize the water at 100°C to steam using the formula: \( q = n \cdot \Delta H_{vaporization} \), where \( \Delta H_{vaporization} \) is the heat of vaporization.

Calculate the heat required to warm the steam from 100°C to 100°C using the formula: \( q = m \cdot c \cdot \Delta T \), where \( c \) is the specific heat of steam. Sum all the calculated heats to find the total heat required.