Which of the following is a physical change?
A)the rusting of iron
B)the condensation of water vapor
C)the baking of a potato
D)the explosion of nitroglycerin

Question

Quizplus · Accepted Answer

Condensation of water vapor is a physical change as it involves the change of state from gas to liquid, without changing the chemical identity of the substance. Rusting of iron (A) and explosion of nitroglycerin (D) are both examples of chemical changes as they involve the formation of new substances. Baking of a potato (C) is a combination of both physical and chemical changes, as it involves the heating and changing of the potato's texture, but also the chemical reactions that occur during cooking. However, as the question specifically asks for a physical change only, B is the best choice.

Which of the Following Is a Physical Change