Question

1. divers found two substances at the bottom of the ocean. at room temperature, both substances are liquid. scientists then transfered the same amount of energy out of both substances. when a scientist checked again, substance 1 had changed phase, but substance 2 had not. how are substances 1 and 2 different?

substance 1 has a . . .
a weaker attraction between its molecules than substance 2. its molecules now move in place.
b weaker attraction between its molecules than substance 2. its molecules now move around each other.
c stronger attraction between its molecules than substance 2. its molecules now move away from each other.
d stronger attraction between its molecules than substance 2. its molecules now move in place.

Explanation:

When the same amount of energy is removed, Substance 1 changed from liquid to solid (phase change to a state where molecules move in place), while Substance 2 stayed liquid. Substances with weaker intermolecular attractions require less energy loss to transition to a more ordered state (solid), where molecules vibrate in place instead of moving freely like in a liquid.

Answer:

a. weaker attraction between its molecules than Substance 2. Its molecules now move in place.