Question

a chemical change of matter takes place when one or more substances change into entirely new substances with different properties. although physical changes affect the appearance of a substance, chemical changes affect its composition. which process indicates that a chemical change is taking place? vinegar bubbles when baking soda is added. a lake freezes over into ice. a metal bar is rolled into a flat sheet. sand, water, and salt combine to form a mixture.

Explanation:

A chemical change results in new substances. When vinegar (acetic acid) reacts with baking soda (sodium bicarbonate), carbon - dioxide gas is produced causing bubbles. This is a chemical reaction forming new substances like carbon - dioxide, water and a salt. Freezing a lake is a physical change (change of state from liquid to solid). Rolling a metal bar is a physical deformation. Mixing sand, water and salt is just a physical combination without forming new substances chemically.

Answer:

Vinegar bubbles when baking soda is added.