Evidence of Chemical Reactions

Question 1

A solid is placed in a solution. Which observation most likely indicates that a chemical reaction has occurred?

Revolt · Accepted Answer

The solid has bubbles forming on its surface.

Question 2

During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. Which of the following scenarios would his students most likely observe?

Revolt · Accepted Answer

A test tube becomes cool to the touch.

Question 3

Which statement describes a chemical reaction?

Revolt · Accepted Answer

Atoms in the reactants are rearranged to form new substances.

Question 4

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?

Revolt · Accepted Answer

A solid forms, and there is a change of color.

Evidence of Chemical Reactions Answers

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