7. as a sample of water turns to ice, a. new molecules are formed. b. the mass of the sample is increased…

7. as a sample of water turns to ice, a. new molecules are formed. b. the mass of the sample is increased. c. the arrangement of the molecules changes. d. energy is absorbed by the molecules.

7. as a sample of water turns to ice, a. new molecules are formed. b. the mass of the sample is increased. c. the arrangement of the molecules changes. d. energy is absorbed by the molecules.

Answer

Brief Explanations:

Water turning to ice is a physical - state change. No new substances (molecules) are formed, mass is conserved according to the law of conservation of mass, and energy is released (exothermic process). The key change is in the molecular arrangement. In water, molecules are more freely moving, while in ice, they are arranged in a more ordered, crystalline structure.

Answer:

C. the arrangement of the molecules changes.