CHM 145 Final (Miami University) Exam Study Guide
Purpose of Lab 1 - ANSWER -to understand colligative properties
-to measure boiling point elevation caused by Table Salt (NaCl) and Table Sugar
(C12H22O11)
What did the LabQuest Measure (exp1) - ANSWER Boiling point of water
Main observations (exp1) - ANSWER Table Salt had a higher boiling point than
Table sugar
How does Salt effect freezing point? - ANSWER Lowers it
The extent of change in vapor pressure, boiling point, freezing point, and
osmotic pressure is a function of: - ANSWER the number of dissolved solute
particles
The addition of a non-volatile solute ____________ the vapor pressure of the
solution and leads to an ____________ in the boiling point. - ANSWER lowers,
elevation
Molality - ANSWER moles of solute/kg of solvent
Moles of particle - ANSWER How many individual atoms are present in the
compound
When do you start the labquest (exp1) - ANSWER when water reaches 80
degrees celcius
In the graph (exp1) the first plateau represents - ANSWER boiling point of pure
solvent
In the graph (exp1) the second plateau represents - ANSWER boiling point of
solvent+solute
Glucose (C6H12O6) is a(n) ________.
When glucose dissolves in water, _________ of solute particles are formed for
every 1 mole of C6H12O6.
Calcium chloride (CaCl2) is a(n) __________.
When calcium chloride dissolves in water, ________ of solute particles are
formed for every 1 mole of CaCl2. - ANSWER -non-electrolyte
-1 mole
-electrolyte
-3 moles
, What is the molality of solute particles in a solution that is prepared by dissolving
29.9 grams of NaNO3 (FW = 85 g/mol) in 0.263 kilograms of water? - ANSWER
2.68
NaNO3 dissociates into Na+ and NO3- in water (2 particles per 1 mol).
((Mass NaNO3 (g)/molar mass (g/mol)) x 2 particles/1 mol)/mass solvent (kg)
Boiling point elevation= - ANSWER Boiling point solution- boiling point solvent
What is the trend between boiling point elevation (∘C) and molality (m) for NaCl?
(exp1) - ANSWER as molality of solute particles increases, delta T increases
What is the trend between boiling point elevation (∘C) and molality (m) for
C12H22O11? (exp1) - ANSWER there is no real trend
If amount of water decreased, what would happen to concentration of salt
solution and boiling point? Why? - ANSWER -The concentration would be larger
and the Tb of the solution will increase.
-With more salt per volume, the vapor pressure is reduced and a higher
temperature is needed for the solution to boil.
Purpose of Lab 2 - ANSWER -monitor rate of chemical reaction
-determine kinetic order based on reactant concentrations
-determine energy of activation of the reaction
Reaction rate - ANSWER The change in concentration of reactants or products
per unit time
chemical kinetics - ANSWER concerned with speeds, or rates, of reactions
What does the LabQuest measure? (exp2) - ANSWER change in pressure of
oxygen gas
For this lab, initial data will be in the form of a _______ vs. time plot.
There is a short lag phase at the beginning of this experiment, but then, the data
will start to ________ with time.
The ______ of this plot will measure the rate of the reaction.
The rate of the reaction initially has units of ______ .
Following the experiment, reaction rates must be converted to units of ______
using the Ideal Gas Law. - ANSWER -pressure
-increase
-slope
-kPa/s
-M/s
Dilution equation - ANSWER M1V1=M2V2
Purpose of Lab 1 - ANSWER -to understand colligative properties
-to measure boiling point elevation caused by Table Salt (NaCl) and Table Sugar
(C12H22O11)
What did the LabQuest Measure (exp1) - ANSWER Boiling point of water
Main observations (exp1) - ANSWER Table Salt had a higher boiling point than
Table sugar
How does Salt effect freezing point? - ANSWER Lowers it
The extent of change in vapor pressure, boiling point, freezing point, and
osmotic pressure is a function of: - ANSWER the number of dissolved solute
particles
The addition of a non-volatile solute ____________ the vapor pressure of the
solution and leads to an ____________ in the boiling point. - ANSWER lowers,
elevation
Molality - ANSWER moles of solute/kg of solvent
Moles of particle - ANSWER How many individual atoms are present in the
compound
When do you start the labquest (exp1) - ANSWER when water reaches 80
degrees celcius
In the graph (exp1) the first plateau represents - ANSWER boiling point of pure
solvent
In the graph (exp1) the second plateau represents - ANSWER boiling point of
solvent+solute
Glucose (C6H12O6) is a(n) ________.
When glucose dissolves in water, _________ of solute particles are formed for
every 1 mole of C6H12O6.
Calcium chloride (CaCl2) is a(n) __________.
When calcium chloride dissolves in water, ________ of solute particles are
formed for every 1 mole of CaCl2. - ANSWER -non-electrolyte
-1 mole
-electrolyte
-3 moles
, What is the molality of solute particles in a solution that is prepared by dissolving
29.9 grams of NaNO3 (FW = 85 g/mol) in 0.263 kilograms of water? - ANSWER
2.68
NaNO3 dissociates into Na+ and NO3- in water (2 particles per 1 mol).
((Mass NaNO3 (g)/molar mass (g/mol)) x 2 particles/1 mol)/mass solvent (kg)
Boiling point elevation= - ANSWER Boiling point solution- boiling point solvent
What is the trend between boiling point elevation (∘C) and molality (m) for NaCl?
(exp1) - ANSWER as molality of solute particles increases, delta T increases
What is the trend between boiling point elevation (∘C) and molality (m) for
C12H22O11? (exp1) - ANSWER there is no real trend
If amount of water decreased, what would happen to concentration of salt
solution and boiling point? Why? - ANSWER -The concentration would be larger
and the Tb of the solution will increase.
-With more salt per volume, the vapor pressure is reduced and a higher
temperature is needed for the solution to boil.
Purpose of Lab 2 - ANSWER -monitor rate of chemical reaction
-determine kinetic order based on reactant concentrations
-determine energy of activation of the reaction
Reaction rate - ANSWER The change in concentration of reactants or products
per unit time
chemical kinetics - ANSWER concerned with speeds, or rates, of reactions
What does the LabQuest measure? (exp2) - ANSWER change in pressure of
oxygen gas
For this lab, initial data will be in the form of a _______ vs. time plot.
There is a short lag phase at the beginning of this experiment, but then, the data
will start to ________ with time.
The ______ of this plot will measure the rate of the reaction.
The rate of the reaction initially has units of ______ .
Following the experiment, reaction rates must be converted to units of ______
using the Ideal Gas Law. - ANSWER -pressure
-increase
-slope
-kPa/s
-M/s
Dilution equation - ANSWER M1V1=M2V2
