A hydrolysis reaction results in which two of the following?
Water is split apart.
Two molecules are split apart.
Water is formed.
Two molecules are combined.
The Correct Answer and Explanation is:
Correct Answers:
✅ Water is split apart.
✅ Two molecules are split apart.
Explanation:
A hydrolysis reaction is a chemical process in which a molecule is broken down into two parts by adding a molecule of water. The term “hydrolysis” comes from Greek: “hydro” meaning water, and “lysis” meaning breaking apart. This reaction is crucial in many biological systems, especially in digestion and cellular metabolism.
During a hydrolysis reaction, a water molecule (H₂O) is used to break a covalent bond between two components of a larger molecule. Here’s what happens chemically:
- One fragment of the original molecule takes a hydrogen ion (H⁺) from the water.
- The other fragment takes the hydroxide ion (OH⁻) from the water.
This results in the splitting of the original molecule into two smaller molecules, which is why the correct statement is: “Two molecules are split apart.”
At the same time, because the water molecule is being used or consumed (its atoms are split and incorporated into the resulting products), it’s also correct to say that: “Water is split apart.”
This is not the same as a dehydration synthesis (also called a condensation reaction), which is essentially the reverse of hydrolysis. In dehydration synthesis, two molecules are combined, and water is formed as a byproduct. But in hydrolysis, water is used (not formed) and molecules are broken apart, not joined.
Biological Example:
In digestion, enzymes use hydrolysis to break down proteins into amino acids, carbohydrates into simple sugars, and fats into fatty acids and glycerol. These smaller units can then be absorbed and used by the body.
Summary:
Hydrolysis reactions:
- Break larger molecules into smaller ones.
- Use water, which is split apart.
- Are essential for metabolism and digestion.