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 liquid.

Explanation:

1. The initial state: Molecules moving around each other describes a liquid (solids have fixed positions, gases move freely).
2. Adding energy increases molecular motion speed, causing a phase change to a higher energy state.
3. The phase above liquid is gas, where molecules move much faster and freely.

Answer:

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