Michigan M-STEP Grade 8 Science Practice Questions - Michigan Student Test Of Educational Progress Grade 8 Science Exam

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During a science lab in Lansing, a student mixes solid baking soda (sodium bicarbonate) into liquid vinegar (acetic acid) inside a beaker. Rapid gas bubbling occurs and the temperature of the beaker drops significantly. Which observation provides the strongest evidence that a chemical reaction occurred?

The total mass of the liquid increased because vinegar expanded. A new gas substance was produced and a thermal energy change occurred. The baking soda dissolved completely to form a homogeneous mixture. The liquid changed color from clear to completely transparent.

Correct Answer:

A new gas substance was produced and a thermal energy change occurred.

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