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.
Answer: C
You might also like to view...
Motion of a P-wave is
A. side to side. B. up and down. C. longitudinal. D. transverse.
In Paris, and other similar cities in France, ________ do a large share of the menial labor
A) Chinese B) North Africans C) Russians D) West Africans E) Portuguese
Meteorologists have grouped air masses into this number of major categories
A) three B) four C) five D) six
One of the drawbacks of leaving crop residues on a field after harvest is increasedÂ
A. Energy use of machinery B. Cost due to the high cost of fertilizers C. Salinization D. Pest and disease problems E. Wind erosion