part a\nyou have probably seen the heating curve of water. this graph represents a cooling curve of another…

part a\nyou have probably seen the heating curve of water. this graph represents a cooling curve of another substance. you can see that over time, the temperature of the substance decreases and the substance changes from a gas to a liquid to a solid. what other information do we know about this substance as it changes?\na there is a decrease in molecular attraction and kinetic energy.\nb molecules get closer together because there is a decrease in kinetic energy.\nc kinetic energy increases while potential energy decreases during the phase changes.\nd during phase change there is a drop in temperature along with a drop in kinetic energy and molecular attractive forces.

part a\nyou have probably seen the heating curve of water. this graph represents a cooling curve of another substance. you can see that over time, the temperature of the substance decreases and the substance changes from a gas to a liquid to a solid. what other information do we know about this substance as it changes?\na there is a decrease in molecular attraction and kinetic energy.\nb molecules get closer together because there is a decrease in kinetic energy.\nc kinetic energy increases while potential energy decreases during the phase changes.\nd during phase change there is a drop in temperature along with a drop in kinetic energy and molecular attractive forces.

Answer

Brief Explanations:

As a substance cools and changes from gas to liquid to solid, kinetic energy decreases. With lower kinetic energy, molecules move less freely and get closer together due to increased intermolecular forces. Option A is wrong as molecular attraction increases. Option C is incorrect because kinetic energy decreases during cooling phase - changes. Option D is wrong since temperature remains constant during phase - changes while heat is being released to change the state.

Answer:

B. Molecules get closer together because there is a decrease in kinetic energy.