CH 126 B NAME:
EXAM #1
Spring 2000
1) Match the term in column A to the one term or statement in column B that best
describes it. Notice that there will be four definitions from column B that will not be
used. (1 point each)
Column A Column B
Rate Constant 1) The proportionality constant in the relationship between
reaction rate and reactant concentrations.
Solubility 2) The exponent, determined by experiment, of the reactant
concentration in a rate law.
Molality 3) A substance that speeds up a reaction without being
consumed.
Order 4) The slowest step in a reaction mechanism.
LeChatelier’s Principle 5) A system at equilibrium, or striving to attain equilibrium,
responds in such a way as to counteract any stress placed upon
it.
Catalyst 6) The threshold energy that must be overcome to produce a
chemical reaction.
Intermediate 7) The time required for a reactant to reach half of its initial
concentration.
Rate-Determining Step 8) A substance that has the ability to emulsify and wash away
oil and grease in as aqueous suspension.
Half-Life 9) A species that is neither a reactant nor a product but that is
formed then consumed in the reaction sequence.
Activation Energy 10) The amount of a substance that dissolves in a given volume
of solvent.
11) The moles of solute divided by the kilograms of solvent.
12) The rate constant divided by two.
13) The constant for the equilibrium expression representing the
dissolving of an ionic solid in water.
14) The energy change when one mole of formula units of a
crystalline solid is formed from its ions, atoms, or molecules in
the gas phase.
