Write the empirical (or molecular) formulas of compounds that these elements in the third period are expected to form with molecular oxygen and molecular chlorine. (If different oxidation states are possible for an element, write the formula for a highest oxidation state.) In each case indicate whether you expect the compound to be ionic or molecular. Element: Compound formed with oxygen: Formula Ionic or molecular? Na Mg Al Si P S Element: Compound formed with chlorine: Formula Ionic or molecular? Na Mg Si P

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