A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels.Upon heating the kernels all pop thereby escaping the skillet.Which of the following physical and/or chemical changes occurred?
A)The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change).
B)The starches within the kernels are cooked by the high temperatures (chemical change).
C)Both A and B occur.
D)Physical and chemical changes cannot occur without a real chemical reaction taking place.

Question

Quizplus · Accepted Answer

Heating the water in the kernel to the point of vaporization is a physical change, while the cooking of starches is a chemical change. Both of these changes occur during the popping of the kernels. Physical and chemical changes can occur without a chemical reaction.

A Skillet Is Lined with a Thin Layer of Cooking