OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program - Science, Grade 8 Exam

Which observation provides empirical evidence that a chemical reaction occurred?

The formation of a new gas and a thermal energy change indicate that chemical bonds rearranged to form new substances. The total liquid volume in the beaker increased because the water expanded. The tablet sank to the bottom of the beaker due to gravitational attraction. The water remained clear and transparent throughout the experiment.

Correct Answer:

The formation of a new gas and a thermal energy change indicate that chemical bonds rearranged to form new substances.

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