Question

6 scientists digging in a cave found an unknown substance. the scientists found that the substances molecules were moving around each other. the scientists increased the speed of the substances molecules and caused a phase change. how did the scientists do this, and how did this affect the substance?
the scientists transferred energy...
a) into the substance, and the substance changed into a gas.
b) into the substance, and the substance changed into a liquid.
c) out of the substance, and the substance changed into a solid.
d) out of the substance, and the substance changed into a liquid.

Explanation:

To increase molecular speed, energy must be added to the substance. The initial state has molecules moving around each other, which describes a liquid. Adding energy to a liquid increases molecular motion, leading to a phase change to a gas, where molecules move freely and rapidly.

Answer:

a. into the substance, and the substance changed into a gas.