CHEM 108 Final Exam Study Guide – Practice Questions, Review & Chemistry
Exam Prep
rate law - correct answer ✔✔expresses the relationship of the rate of a reaction to the rate
constant and the concentrations of the reactants raised to some powers (products are not used
in rate law)
half life - correct answer ✔✔t1/2 is the time required for the concentration of a reactant to
decrease to half of its initial concentration
temperature and rate - correct answer ✔✔high temp faster rate of reaction higher k
k is temperature dependent
activation energy - correct answer ✔✔Ea is the minimum amount of energy required to initiate
a chemical reaction
reaction mechanism - correct answer ✔✔the sequence of elementary steps that lead to
product formation
intermediate - correct answer ✔✔formed and consumed in elementary steps. does not appear
in overall reaction
molecularity of a reaction - correct answer ✔✔is the number of molecules reacting in an
elementary step
1. unicmolecular- elementary step with 1 moleucule
2. bimolecular- elementary step with 2 molecules
3. termolecular- elementary step with 3 molecules
, rate determining step - correct answer ✔✔slowest step in the sequence of steps leading to
product formation
equilibrium constant - correct answer ✔✔K relates to concentrations of the reactants and
products at equilibrium. when the forward reaction is favored K>1. when reactants are favored
reverse reaction K<1
concentrations - correct answer ✔✔concentrations of solutes in mol/L
concentrations of gases in bars
concentrations of pure solids and liquids are omitted
homogeneous equilibrium - correct answer ✔✔reactions in which all reacting species are in the
same phase
le chatelier's principle - correct answer ✔✔if an external stress is applied to a system at
equilibrium the system adjusts in such a way that the stress is partially offset as the system
reaches a new equilibrium
changes that effect-
1. changes in concentration
2. change in volume and pressure
3. change in temperature
4. adding a catalyst
4 types of intermolecular forces - correct answer ✔✔1. dipole-dipole
2. ion-dipole
3. dispersion forces
4. hydrogen bond
Exam Prep
rate law - correct answer ✔✔expresses the relationship of the rate of a reaction to the rate
constant and the concentrations of the reactants raised to some powers (products are not used
in rate law)
half life - correct answer ✔✔t1/2 is the time required for the concentration of a reactant to
decrease to half of its initial concentration
temperature and rate - correct answer ✔✔high temp faster rate of reaction higher k
k is temperature dependent
activation energy - correct answer ✔✔Ea is the minimum amount of energy required to initiate
a chemical reaction
reaction mechanism - correct answer ✔✔the sequence of elementary steps that lead to
product formation
intermediate - correct answer ✔✔formed and consumed in elementary steps. does not appear
in overall reaction
molecularity of a reaction - correct answer ✔✔is the number of molecules reacting in an
elementary step
1. unicmolecular- elementary step with 1 moleucule
2. bimolecular- elementary step with 2 molecules
3. termolecular- elementary step with 3 molecules
, rate determining step - correct answer ✔✔slowest step in the sequence of steps leading to
product formation
equilibrium constant - correct answer ✔✔K relates to concentrations of the reactants and
products at equilibrium. when the forward reaction is favored K>1. when reactants are favored
reverse reaction K<1
concentrations - correct answer ✔✔concentrations of solutes in mol/L
concentrations of gases in bars
concentrations of pure solids and liquids are omitted
homogeneous equilibrium - correct answer ✔✔reactions in which all reacting species are in the
same phase
le chatelier's principle - correct answer ✔✔if an external stress is applied to a system at
equilibrium the system adjusts in such a way that the stress is partially offset as the system
reaches a new equilibrium
changes that effect-
1. changes in concentration
2. change in volume and pressure
3. change in temperature
4. adding a catalyst
4 types of intermolecular forces - correct answer ✔✔1. dipole-dipole
2. ion-dipole
3. dispersion forces
4. hydrogen bond
