Question

1. lily is doing a science experiment with a substance in a sealed jar. at first, the substances molecules are moving around each other. what will happen to lilys substance if she transfers energy into the substance and causes a phase change?

after the phase change, the substances molecules will move . . .
a) faster, and the substance will be a liquid.
b) faster, and the substance will be a gas.
c) slower, and the substance will be a solid.
d) slower, and the substance will be a liquid.

Explanation:

The initial state has molecules moving around each other, which describes a liquid. Adding energy increases molecular motion, leading to a phase change to gas, where molecules move faster and freely.

Answer:

b. faster, and the substance will be a gas.