Persons who have been submerged in very cold water and who...

Name: Problem 9, Chapter 13: Chemistry: The Molecular Nature of Matter
Uploaded: 2021-07-27T19:52:12-08:00
Duration: 1 min 29 s
Channel: David Collins
Description: Persons who have been submerged in very cold water and who are believed to have drowned sometimes can be revived. On the other hand, persons who have been submerged in warmer water for the same length of time have died. Explain this in terms of factors that affect the rates of chemical reactions.

Persons who have been submerged in very cold water and who are believed to have drowned sometimes can be revived. On the other hand, persons who have been submerged in warmer water for the same length of time have died. Explain this in terms of factors that affect the rates of chemical reactions.

Key Concepts

Temperature Dependence of Reaction Rates

Chemical reactions generally proceed faster at higher temperatures because increased kinetic energy leads to more frequent and effective collisions between molecules. This principle explains why metabolism and other biochemical processes slow down in colder conditions, as the overall reaction rates decrease.

Enzyme Kinetics

Enzymes catalyze vital biochemical reactions in the body, and their activity is highly sensitive to temperature. At lower temperatures, enzyme activity decreases, resulting in slower metabolic processes, reduced oxygen consumption, and diminished production of potentially harmful metabolic byproducts.

Hypothermia's Protective Effects

Lowering body temperature, whether accidental or induced, slows down metabolic reactions and reduces the demand for oxygen in tissues. This slowing of chemical reactions can minimize cellular damage during periods of oxygen deprivation, providing a protective effect on critical organs such as the brain during events like drowning.

Arrhenius Equation

The Arrhenius equation mathematically describes how the rate of chemical reactions increases with temperature. It highlights that even small changes in temperature can have a significant impact on reaction rates, offering a quantitative explanation for why colder conditions can 'preserve' tissue function by reducing metabolic activity.

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