Question

when water freezes, what happens to the volume of the sample? it decreases. it increases. it stays the same.

Explanation:

When water freezes, it forms ice. Water has a unique property where its density decreases upon freezing. Since density ($
ho=\frac{m}{V}$ where $m$ is mass and $V$ is volume) and volume are inversely related for a constant mass (mass of water remains the same during freezing - law of conservation of mass), a decrease in density leads to an increase in volume.

Answer:

It increases.