Question

For the examples below, explain what a physical change or a chemical change has occurred. Justify your answer

A. When you mix baking soda and vinegar, carbon dioxide is released.

B. You build a tall sand castle at the beach. After wave washes it over, the sand castle turns into a big pile of sand

C. Boiling water turns a raw egg into a hard boiled egg

D. Max divided cookie dough into small pieces on a cookie sheet.

E. A loaf of freshly baked bread tastes better and looks much different than a lump of bread dough

F. A glass of water is left in the Sun. In the time, the water evaporates leaving the glass empty.

Answer 1

Letters A, E, and F undergo chemical change because new substances are formed as to carbon dioxide, bread, and water vapor respectively, whereby letters B, C, and D undergo physical change because the tall sand castle remains as sand, the raw egg remains as an egg as it hardens (boiled) and the cookies remain as cookies no matter how many times it was divided into smaller pieces. The later substances' chemical composition were never changed nor formed new substances as they undergo physical processes.