5 Written Questions

1. Atoms of two or more elements may combine in different ratios to produce more than one compound.
2. Small discrete increments of energy.
3. Inherent physical properties of a substance that can be determined without altering its composition: color, taste, odor, state of matter, density, melting point, boiling point.
4. The resistance in a liquid to increase its surface area.
5. The amount of space occupied by matter; measured in liters and milliliters.

5 Matching Questions

1. temperature
2. vaporization
3. Pauli exclusion principle
4. normal boiling point
5. Thomson model of the atom

1. a An atomic orbital can hold a maximum of two electrons which must have opposite spins.
2. b A measure of the intensity of heat, or of how hot or cold a system is; SI unit is the kelvin (K).
3. c The temperature at which the vapor pressure of a liquid equals 1 atm or 760 torr pressure.
4. d Evaporation.
5. e Thomson asserted that atoms are not indivisible but are composed of smaller parts; they contain both positively and negatively charged particles- protons as well as electrons.

5 Multiple Choice Questions

1. The energy required to remove an electron from an atom.
   1. vaporization
   2. stoichiometry
   3. ionization energy
   4. transition elements
2. 0 degrees C (273 K) and 1 atm (760 torr).
   1. STP (Standard Temperature and Pressure)
   2. tetrahedral structure
   3. temperature
   4. supersaturated solution
3. An atom of an element that has the same atomic number but different atomic mass.
   1. solute
   2. isotope
   3. proton
   4. VSEPR
4. Solids, liquids, and gases.
   1. partial pressure
   2. unsaturated solution
   3. physical states of matter
   4. physical properties
5. The horizontal groupings (rows) of elements in the periodic table.
   1. proton
   2. period
   3. photon
   4. ion

5 True/False Questions

1. molar mass → The substance that the solute is dissolved into.

   True        False

2. ion → A unit of pressure (1 torr = 1 mm Hg).

   True        False

3. phase → SI unit of length. 39.37 inches.

   True        False

4. vapor pressure → The pressure exerted by a vapor in equilibrium with its liquid.

   True        False

5. weight → A state of matter that has no shape or definite volume.

   True        False