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

C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l), ΔH = -1,370 kJ. For the combustion of ethanol as described above, which of the following statements is true?

The enthalpy change would be the same if gaseous water were produced instead of liquid water.

The reaction is exothermic.

The reaction is endothermic.

The reaction absorbs heat from the surroundings.

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Verified step by step guidance

Identify the type of reaction: The given chemical equation represents the combustion of ethanol, which is a type of exothermic reaction where a substance reacts with oxygen to produce carbon dioxide and water.

Understand the enthalpy change (ΔH): The enthalpy change for the reaction is given as -1,370 kJ. A negative ΔH indicates that the reaction releases heat to the surroundings, which is characteristic of an exothermic reaction.

Consider the states of products: The enthalpy change can vary depending on the physical states of the products. If gaseous water were produced instead of liquid water, the enthalpy change would be different due to the additional energy required to convert liquid water to gaseous water (latent heat of vaporization).

Evaluate the statements: Based on the negative ΔH value, the statement 'The reaction is exothermic' is true. The other statements suggesting the reaction is endothermic or absorbs heat are incorrect.

Conclude the analysis: The key takeaway is that the combustion of ethanol is an exothermic process, releasing heat, as indicated by the negative enthalpy change.