Table of contents

1. The Chemical World9m
- The Scientific Method
  9m
2. Measurement and Problem Solving2h 19m
3. Matter and Energy2h 15m
4. Atoms and Elements2h 33m
5. Molecules and Compounds1h 50m
6. Chemical Composition1h 23m
7. Chemical Reactions1h 43m
8. Quantities in Chemical Reactions1h 8m
9. Electrons in Atoms and the Periodic Table2h 32m
10. Chemical Bonding2h 10m
11 Gases2h 7m
12. Liquids, Solids, and Intermolecular Forces1h 11m
13. Solutions3h 1m
14. Acids and Bases2h 14m
15. Chemical Equilibrium1h 27m
16. Oxidation and Reduction1h 33m
17. Radioactivity and Nuclear Chemistry53m

15. Chemical Equilibrium

Energy Diagrams

Introduction to Chemistry

15. Chemical Equilibrium

Energy Diagrams

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Multiple Choice

Which of the following statements is true regarding the energy diagram provided?

i. The reaction is endothermic.
ii. The activation energy is +10 kJ.
iii. The reaction releases energy.
iv. The enthalpy of the reaction is –25 kJ.

I only

II and IV

I and III

II, III and IV

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Verified step by step guidance

Examine the energy diagram provided. The y-axis represents Gibbs Free Energy, and the x-axis represents the reaction coordinate.

Identify the initial and final energy levels on the diagram. The initial energy level is higher than the final energy level, indicating that the reaction releases energy.

Determine the activation energy by finding the difference between the peak energy and the initial energy level. This is the energy barrier that must be overcome for the reaction to proceed.

Calculate the change in enthalpy (ΔH) by subtracting the final energy level from the initial energy level. A negative ΔH indicates an exothermic reaction.

Based on the analysis, evaluate the given statements: i. The reaction is endothermic (false), ii. The activation energy is +10 kJ (true if the peak is 10 kJ above the initial level), iii. The reaction releases energy (true), iv. The enthalpy of the reaction is –25 kJ (true if the final level is 25 kJ below the initial level).