Which of the following statements is most accurate? a. when liquid water is heated, the molecules move faster. b. when liquid water is heated, the molecules collide more often. c. when liquid water is heated, collisions between molecules are more violent. d. all of the above.

ans: D all the above
       
Explanation: Increase in temperature causes increase in kinetic energy, so statement A would be correct (water molecules move entropically or, randomly). Logically, statement B would also be correct (faster random movements lead to more collisions). Likewise for statement C (think people running into each other vs cars running into each other, different speeds). So you're looking at D as the right answer.