Each chemical element has a unique . the sum of the number of protons and neutrons in an atom is called the . the number of protons in an atom is called the atom's . an atom with more electrons than protons has a negative . most hydrogen atoms have only a single proton in their nucleus, so a hydrogen atom that also has one neutron is an of hydrogen.

An alcohol thermometer makes use of alcohol's changing in order to measure temperature. as the temperature goes up, the alcohol contained in the thermometer increases in volume, filling more of the thermometer's tube.

When the water vapor cools it condenses select a number that represents his process on the

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