Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

3. Acids and Bases

Reaction Mechanism

Organic Chemistry

3. Acids and Bases

Reaction Mechanism

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Multiple Choice

Which graph best represents the energy profile of a reaction when an enzyme is present?

A graph showing a decrease in the overall energy change of the reaction.

A graph showing a lower activation energy peak compared to the reaction without an enzyme.

A graph showing no change in activation energy compared to the reaction without an enzyme.

A graph showing a higher activation energy peak compared to the reaction without an enzyme.

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Verified step by step guidance

Understand the role of enzymes: Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to proceed.

Define activation energy: Activation energy is the minimum energy required for reactants to undergo a chemical reaction and form products. It is represented as a peak in the energy profile graph.

Compare energy profiles: In a reaction without an enzyme, the activation energy is higher, resulting in a taller peak in the energy profile graph. With an enzyme, the activation energy is lower, resulting in a shorter peak.

Visualize the graph: The energy profile graph with an enzyme will show a lower peak compared to the graph without an enzyme, indicating reduced activation energy.

Conclude the effect of enzymes: The presence of an enzyme does not change the overall energy change of the reaction (ΔG), but it lowers the activation energy, making the reaction proceed faster.