A Reactant R Is Being Consumed in a First-Order Reaction

question 64

Multiple Choice

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

• A)0.94
• B)0.87
• C)0.75
• D)0.13
• E)0.063

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Definitions:

Negative Feedback

A control system where a trigger leads to a contrary outcome to keep a regulated factor at its optimal state.

Body Temperature

The measure of the body's ability to generate and get rid of heat, vital for maintaining metabolic processes.

Vasodilation

The widening of blood vessels, which decreases blood pressure and increases blood flow.

Dorsal Cavity

A cavity in the posterior part of the body that houses the brain and spinal cord, part of the central nervous system.