Question

Scientists digging in a cave found an unknown substance. The scientists
found that the substance’s molecules were moving around each other. The scientists
increased the speed of the substance’s molecules and caused a phase change. How
did the scientists do this, and how did this affect the substance?

Answer 1

Answer:

By adding heat energy

It became a gas

Explanation:

The molecules moving about another is a clear indicator that the substance is a liquid.

In a liquid, the molecules stick together and move about one another.

• When the scientist increase the speed of the of substance, the kinetic energy increases.
• if this increase causes a phase change, then the substance becomes a gas.
• So, by adding heat energy a substance becomes gaseous if it is a liquid already.