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Chem Unit 2


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True or False:
A high concentration doesn't effect the vapor pressure very much.
False. A high concentration changes the vapor pressure considerably.
Vapor pressure of a solution is ______ then the pure liquid.
True or False:
Normal boiling point is different for the pure liquid then for the solution.
Properties that change as a function of the number of solute particles are called __________ properties.
List the four colligative properties:
1. Vapor Pressure
2. Boiling Point
3. Freezing Point
4. Osmotic Pressure
The migration of solvent molecules through a differentiating membrane from lower concentration to higher concentrations.
The larger the gap is between the high concentration substance and the lower concentration substance the ___________ the pressure is.
As the concentration of a solution increases, the vapor pressure _________.
As the concentration of a solution increases, the osmotic pressure _________.
As the concentration of a solution decreases, the boiling point __________.
As the concentration of a solution decreases, the freezing point _________.
The pressure at which an equilibrium is reached for the migration of solvent molecules through a differentiating membrane is the ___________ pressure.
If the mole fraction of a solvent was 0.5, the vapor pressure would go down by ________.
K-sub-f is the:
K-sub-b is the:
Molale freezing point depression constant.

Molale boiling point elevation constant.
The change in osmotic pressure is symbolized by the symbol ____.
The formula for the change in osmotic pressure:
The formula for the change in boiling point is:
Delta T (because it is a change of temperature)
The formula for the change in freezing point:
Delta T (because it is a change of temperature)
In ionic solutions, what is different with the calculations to determine the change in osmotic pressure, boiling point or freezing point?
An ionic molecule breaks apart into two particles, so 1.3 m of NaCl actually equals 2.6 moles of particles.
K-sub-f and K-sub-b are both measured in:
degrees C/molal
Describe how you would go about finding the molar mass of a molecule using colligative property data:
1. Get concentration
2. Determine moles of solute
3. Knowing the mass and moles, determine molar mass.
Delta H represents:
Enthalpy (heat content)
If delta-H is positive, the reaction is ____thermic. If delta-H is negative, the reaction is ____thermic.
A __________ reaction takes place on it's own.
Delta-G represents:
The free energy of a solution.
If delta-G is negative, the order of the substance is _________ in the reaction.
Less order makes the reaction _______ spontaneous.
What is the formula that represents the change in total energy in a reaction?
Delta G = Delta H - T(Delta S)
If Delta G is positive, there is a(n)____________ in order.
At equilibrium, delta G is ________.
If DeltaG is ____________, the reaction is ____________.
Negative = Spontaneous
Positive = Nonspontaneous
As the temperature increases, the entropy term becomes ________ significant.
More and more
If heat is released in a reaction, it is said to be ________ ________.
Enthalpy driven
At high temperatures, enthalpy can take over and a reaction can become _________ _________.
Entropy driven
Unsaturated hydrocarbons are AKA:
Alkenes (double bonds) and
Alkynes (triple bonds)
Saturated hydrocarbons are AKA:
______ groups on carbon chains create alcohols.
Groups that are attached onto carbon chains are called _________ groups.
A condensation reaction creates __________ molecules.
An amino acid contains a _______ group and a ________ group.
Amine group and acid group
List the four factors that affect rates of reactions.
1. Temp
2. Pressure and concentration
3. Catalysts
4. State of matter
A ________ changes the activation energy.
Activation energy
The energy required to get a reaction going.

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