As NH₄NO₃ Dissolves in Water, the Resulting Solution Becomes Colder

question 25

Multiple Choice

As NH₄NO₃ dissolves in water, the resulting solution becomes colder. Which of the following expressions is most correct?

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Definitions:

Bystander Effect

One reason people fail to help strangers in distress: The larger the group a person is in, the less likely he is to help, partly because no one in the group thinks it is up to him to act.

Commotion

Commotion refers to a state of noisy confusion or disorder.

Bystander Effect

The social psychological phenomenon that individuals are less likely to offer help to a victim when other people are present, often due to the diffusion of responsibility.

Attribution of Arousal Theory

A psychological principle suggesting that people make sense of their emotional or physiological states by attributing them to environmental or situational cues.