According to Collision Theory, the Increase in the Rate Constant

question 76

Multiple Choice

According to collision theory, the increase in the rate constant with increasing temperature is due mostly to the fact that

• A)the activation energy decreases with increasing temperature.
• B)the fraction of the collisions having sufficient energy to react increases with increasing temperature.
• C)the pressure of the reactants increases with increasing temperature.
• D)the heat change for most reactions is negative.
• E)the fraction of the collisions that have the proper orientation for reaction increases with increasing temperature.

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Definitions:

Natural Experiments

Research designs that involve observing the effects of naturally occurring variables or events, as opposed to manipulations made by the researcher.

Quasi-experiments

Research designs that attempt to establish cause-and-effect relationships but lack the element of random assignment to treatment or control groups.

External Validity

The extent to which the results of a study can be generalized or applied to contexts outside of the experimental conditions.

Matched Control Group

In experimental research, a group of subjects closely matched to the experimental group in key variables but not receiving the intervention.