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

Which statement is true regarding the energies involved in an endothermic reaction?

The energy needed to break the required bonds is less than the energy released when new bonds form.

No energy is required to break the bonds in an endothermic reaction.

The energy needed to break the required bonds is equal to the energy released when new bonds form.

The energy needed to break the required bonds is greater than the energy released when new bonds form.

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Verified step by step guidance

Understand the concept of an endothermic reaction: In an endothermic reaction, the system absorbs energy from the surroundings. This means that the energy required to break the bonds in the reactants is greater than the energy released when new bonds are formed in the products.

Analyze the energy changes: In chemical reactions, bonds in reactants must be broken, which requires energy input. New bonds are formed in the products, which releases energy. For an endothermic reaction, the energy input for breaking bonds is higher than the energy output from forming bonds.

Compare the given statements: Evaluate each statement based on the definition of an endothermic reaction. The statement that correctly describes the energy dynamics in an endothermic reaction is the one where the energy needed to break the required bonds is greater than the energy released when new bonds form.

Consider the energy balance: The overall energy change in an endothermic reaction is positive, indicating that the system absorbs energy. This aligns with the statement that the energy needed to break bonds exceeds the energy released during bond formation.

Conclude with the correct statement: Based on the analysis, the correct statement regarding the energies involved in an endothermic reaction is that the energy needed to break the required bonds is greater than the energy released when new bonds form.