Kernels of corn are heated and become popcorn. Why is this a chemical change? A. The size and color of the corn have changed. B. The kernels change due to their reaction to heat. C. The volume of the kernels expands. D. The mass of the kernels increases.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

i believe the answer is three water molecules

a chemical change results in a new substance being formed; whereas a physical change will result in a different state of matter

explanation: