1. CHEM 112 Spring 2011 Exam 1 Review

14. Things you must know???? Converting units of pressure. Using the empirical gas laws. Deriving empirical gas laws from the ideal gas law. Using the ideal gas law. Relating gas density and molecular weight. Solving stoichiometry problems involving gases. Calculating partial pressures and mole fractions. Calculating the amount of gas collected over water. Calculating the rms speed of gas molecules. Calculating the ratio of effusion rates of gases. Using the van der Waals equation.

15. Important! Calculating the heat required for a phase change of a given mass of substance. Calculating vapor pressures and heats of vaporization. Relating the conditions for the liquification of a gas to the critical temperature. Identifying intermolecular forces. Determining relative vapor pressure on the basis of intermolecular attraction. Identifying types of solids.

16. Important! Determining the relative melting points based on types of solids. Determining the number of atoms per unit cell. Calculating atomic mass from unit-cell dimension and density. Calculating unit-cell dimensions from unit-cell type and density.