AEPA Chemistry NT306 Practice Questions - Arizona Educator Proficiency Assessments Chemistry (NT306) Exam

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A chemistry teacher tests whether temperature affects the rate at which magnesium reacts with hydrochloric acid. Which variable should be deliberately changed between trials?

The mass of magnesium used The concentration of hydrochloric acid The temperature of the acid solution The method used to collect hydrogen gas

Correct Answer:

The temperature of the acid solution

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