Which of the Following Statements Is True of Chemical Reactions

question 14

Multiple Choice

Which of the following statements is true of chemical reactions?

• A)They always release heat.
• B)They always absorb heat.
• C)They create atoms of the elements taking part in the reaction.
• D)They rearrange the elements into different molecules in the reaction.

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Definitions:

Nominal Variables

Variables that represent categories with no inherent order or rank among them.

Test Statistic

A figure derived from data within a sample during an empiric test, employed to determine the necessity of dismissing the null hypothesis.

Seat Belts

Equipment installed in vehicles to shield individuals from injurious motion during crashes or sudden stops.

Z-test

A statistical procedure that determines whether the averages of two large-sample populations differ significantly, assuming variances are known.