Which of the following statements are TRUE for the process of dissolving NaCl in water? a. NaCl remains bonded together.
b. Na+ and Cl- become free ions.
c. The attractive forces between water and NaCl are weaker than the forces holding NaCl together,
d. All of the above

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •