Four mixtures are made by combining two clear liquids, and observations are made. Which mixture demonstrates that a chemical change has occurred? Mixture 1: The combined liquids have a greater mass than either of the starting liquids.

Mixture 2: The liquids, when mixed, produce a white solid, which settles to the bottom.

Mixture 3: The mixture of the two liquids takes the shape of the container.

Mixture 4: The denser of the two liquids lies below the other, less dense liquid.