Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

7. Energy, Rate and Equilibrium

Endothermic & Exothermic Reactions

GOB Chemistry

7. Energy, Rate and Equilibrium

Endothermic & Exothermic Reactions

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3:39 minutes

Problem 70b

Textbook Question

Classify each of the following as exothermic or endothermic:
b. In the body, the synthesis of proteins requires energy.

Verified step by step guidance

Understand the definitions of exothermic and endothermic processes: Exothermic processes release energy (usually in the form of heat) to the surroundings, while endothermic processes absorb energy from the surroundings.

Analyze the given scenario: The synthesis of proteins in the body involves the formation of peptide bonds between amino acids, which is a chemical reaction.

Recall that forming complex molecules (like proteins) from simpler ones (like amino acids) typically requires an input of energy to drive the reaction forward. This is because the process involves overcoming activation energy and creating higher-energy bonds.

Recognize that the energy required for protein synthesis in the body is often supplied by molecules like ATP (adenosine triphosphate), which provides the necessary energy input for the reaction.

Conclude that since the synthesis of proteins requires energy input, it is classified as an endothermic process.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Exothermic Reactions

Exothermic reactions are processes that release energy, usually in the form of heat, to their surroundings. This occurs when the total energy of the products is lower than that of the reactants, resulting in a net release of energy. Common examples include combustion and respiration, where energy is produced as a byproduct.

Endothermic Reactions

Endothermic reactions are processes that absorb energy from their surroundings, leading to a decrease in temperature in the environment. In these reactions, the total energy of the products is higher than that of the reactants, requiring an input of energy. Photosynthesis is a classic example, where plants absorb sunlight to convert carbon dioxide and water into glucose.

Protein Synthesis

Protein synthesis is the biological process through which cells generate new proteins, essential for various cellular functions. This process is endothermic, as it requires energy input, typically derived from ATP (adenosine triphosphate). During protein synthesis, amino acids are linked together in a specific sequence dictated by mRNA, forming polypeptides that fold into functional proteins.