What would happen when a substance changes from one phase to another? a. the substance loses or gains heat. b. the average kinetic energy of the substance changes. c. the temperature of the substance changes. d. the molecular motion of the substance changes.

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

Which of the following will cause an increase in the acceleration of an object? increase force decrease force increase mass decrease mass

Select the correct answer. which statement best explains the octet rule? a. atoms gain, lose, or share electrons to achieve a full valence shell. b. compounds always consist of eight electrons. c. molecules always consist of eight atoms. d. all atoms require eight electrons to form bonds.