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.

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

What shape would a molecule with two bound groups and two lone pairs have?