Question

students mixed two liquids in a beaker and listed their observations. liquid 1 was colorless. liquid 2 was colorless. the mixture of liquids 1 and 2 formed a colorless solution. solid particles formed and fell to the bottom of the beaker. the breakdown of molecules of food by enzymes and acid in the stomach. saliva is mixed with food to make food particles softer and easier to swallow. hydrochloric acid and enzymes help break down food molecules into smaller. which observation provides the best, which statement explains that a chemical change occurred? a. there is a change in shape. b. there is a change in volume. c. the two liquids mix into a solution. d. the two liquids form a new substance. none of the above

Explanation:

A chemical change results in the formation of a new substance. When two liquids react and solid particles form and fall to the bottom, it indicates a chemical reaction has occurred and a new substance has been created. Changes in shape or volume are physical changes, and just mixing into a solution doesn't necessarily mean a chemical change (it could be a physical - mixing like dissolving).

Answer:

D. The two liquids form a new substance.