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UNE 1011 MIDTERM EXAM 2025 BRAND
NEW ACTUAL EXAM WITH ANSWERS.
Water and other polar molecules; has ion-dipole attraction;
dissociation occurs with these molecules; most ions dissociate
completely and are strong electrolytes -correct answer -ionic
electrolytes
pure water is very bad conductor bc its only slightly ionized; water
ionizes when one molecule of water gives up a proton to another
molecule of water yielding hydronium and hydroxide ions -correct
answer -covalent electrolytes
______ interactions are the sole energetic factor a -correct
answer -solute-solvent interactions
What is the relationship between temperature and dissolved gas
concentration? It is responsible for a major impact of thermal
solution in natural waters -correct answer -inverse relationship
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the quantity of an ideal gas that dissolves in a definite volume of
liquid is directly proportional to the pressure of gas; Cg=kPg -
correct answer -henrys law
liquids that have infinite mutual solubility or can be mixed to form
a solution at any proportion; usually have similar properties ; high
solubility -correct answer -miscible liquids
two liquids that do not mix and form layers; very low (not zero)
mutual solubility -correct answer -immiscible liquids
a convenient unit for use in stoichiometric calculations defined in
terms of molar amounts of solute species; M=mol solute/ L
solution; does not change with changing temp -correct answer -
molarity
a concentration unit defined as the ratio of the number of moles of
solute to the mass of solvent in kg; m=mol solute/kg solvent -
correct answer -molality
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lower vapor pressure results in ___ boiling point -correct answer -
higher
substance whose vapor pressure is negligible (P*=0) -correct
answer -nonvolatile substance
process where solutions whose components have significantly
different vapor pressures may be separated by a selective
vaporization process; since the vapor pressure of a solution is
lowered due to the presence of nonvolatile solutes, the solutions
boiling point will be increased -correct answer -distillation of
solutions
In the process of ______, diffusion serves to move water through
a semipermeable membrane from a less concentrated solution to
a more concentrated solution -correct answer -osmosis
The amount of pressure that must be applied to the more
concentrated solution to cause osmosis to stop; if greater
pressure applied, the water will go from ___ concentrated solution
to the ___ concentrated solution -correct answer -osmotic
pressure; more; less(more pure)
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Colligative properties depend on the ____ of solute -correct
answer -amount of solute (NOT the type of solute)
consequences of vapor pressure lowering -correct answer -boiling
point elevation: will take higher pressure for vapor pressure to=
atmospheric pressure
freezing point depression: based on molality; subtracting amount
in osmosis, vapor pressure is ___ on the side with more particles
than the pure solvent -correct answer -lower
water moves into the RBC, cell will swell and burst/ lysis; less
than saline -correct answer -hypotonic
five factors affecting reaction rates -correct answer -1. the
chemical nature of the reacting substance
2. The physical state- gas, liquid, solid
3. temperature of reactants- faster at higher temps
4.concentration of reactants: increase rate with increase
concentrations
UNE 1011 MIDTERM EXAM 2025 BRAND
NEW ACTUAL EXAM WITH ANSWERS.
Water and other polar molecules; has ion-dipole attraction;
dissociation occurs with these molecules; most ions dissociate
completely and are strong electrolytes -correct answer -ionic
electrolytes
pure water is very bad conductor bc its only slightly ionized; water
ionizes when one molecule of water gives up a proton to another
molecule of water yielding hydronium and hydroxide ions -correct
answer -covalent electrolytes
______ interactions are the sole energetic factor a -correct
answer -solute-solvent interactions
What is the relationship between temperature and dissolved gas
concentration? It is responsible for a major impact of thermal
solution in natural waters -correct answer -inverse relationship
, Page | 2
the quantity of an ideal gas that dissolves in a definite volume of
liquid is directly proportional to the pressure of gas; Cg=kPg -
correct answer -henrys law
liquids that have infinite mutual solubility or can be mixed to form
a solution at any proportion; usually have similar properties ; high
solubility -correct answer -miscible liquids
two liquids that do not mix and form layers; very low (not zero)
mutual solubility -correct answer -immiscible liquids
a convenient unit for use in stoichiometric calculations defined in
terms of molar amounts of solute species; M=mol solute/ L
solution; does not change with changing temp -correct answer -
molarity
a concentration unit defined as the ratio of the number of moles of
solute to the mass of solvent in kg; m=mol solute/kg solvent -
correct answer -molality
, Page | 3
lower vapor pressure results in ___ boiling point -correct answer -
higher
substance whose vapor pressure is negligible (P*=0) -correct
answer -nonvolatile substance
process where solutions whose components have significantly
different vapor pressures may be separated by a selective
vaporization process; since the vapor pressure of a solution is
lowered due to the presence of nonvolatile solutes, the solutions
boiling point will be increased -correct answer -distillation of
solutions
In the process of ______, diffusion serves to move water through
a semipermeable membrane from a less concentrated solution to
a more concentrated solution -correct answer -osmosis
The amount of pressure that must be applied to the more
concentrated solution to cause osmosis to stop; if greater
pressure applied, the water will go from ___ concentrated solution
to the ___ concentrated solution -correct answer -osmotic
pressure; more; less(more pure)
, Page | 4
Colligative properties depend on the ____ of solute -correct
answer -amount of solute (NOT the type of solute)
consequences of vapor pressure lowering -correct answer -boiling
point elevation: will take higher pressure for vapor pressure to=
atmospheric pressure
freezing point depression: based on molality; subtracting amount
in osmosis, vapor pressure is ___ on the side with more particles
than the pure solvent -correct answer -lower
water moves into the RBC, cell will swell and burst/ lysis; less
than saline -correct answer -hypotonic
five factors affecting reaction rates -correct answer -1. the
chemical nature of the reacting substance
2. The physical state- gas, liquid, solid
3. temperature of reactants- faster at higher temps
4.concentration of reactants: increase rate with increase
concentrations
