Molecules that have longer arrows are moving faster. which statement describes what is happening in this system? a) molecules vibrate more as temperature decreases. b)temperature is not related to the average kinetic energy of a system. c)kinetic energy decreases as temperature decreases. d)there is no change in average kinetic energy between these two systems.

Option (C) is the correct answer.

Explanation:

When particles move from their initial position then the energy held by them is known as kinetic energy.

Kinetic energy of molecules of a substance is directly proportional to temperature.

Mathematically,         K.E =

where            k = boltzmann constant

                      T = temperature

Therefore, an increase in temperature will increase the kinetic energy of particles.

Therefore, we can conclude that the statement kinetic energy decreases as temperature decreases, correctly describes what is happening in the given system.

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.

the objects have the same charge is correct.

nathan lee