chem 210 final exam Questions With
Updated Answers
how can you increase a solid substance solubility in a solution? - Answers-raise the
temperature
.This term/concept describes why grocers spray fruits and vegetables periodically to
make them look fresh - Answers-osmosis
.what is the reason why icy roads are sprayed with salt in the winter time - Answers-the
salt lowers the temperature at which the water on the roads will freeze "Freezing Point
Depression"
.what do we call the dip at the top of the water level in a graduated cylinder - Answers-
meniscus
.if the maximum amount of solute that can dissolve in 100 mL of water is 24 grams .
what would the solution be called if we forced 26 g of solute in it - Answers-
supersaturated
.this type of solution has particles floating at the top and settled at the bottom -
Answers-suspension
.this phenomenon occurs when a laser passes through a colloid and is also seen in the
path of light caused by your car's headlights on a foggy night - Answers-tyndall effect
.what is the intermolecular force that binds water and molecules together - Answers-
hydrogen bonds
.why won't water and oil mix - Answers-"like dissolve likes" water is polar and oil is non-
polar
.this type of mixture is cloudy - Answers-colloid
.why do cooks often add salt to their boiling water - Answers-the salt raises the
temperature at which water boils and makes the water hotter which cooks the food
faster
.the term describes the number of moles in a Liter of solution =moles/L - Answers-
molarity
.this type of solution does not hold the maximum amount of solute that a certain amount
of solvent can hold - Answers-unsaturated
, .when most solutes are dissolved, heat is absorbed. what type of reaction is this -
Answers-endothermic
.what is an excellent solvent for most solutes - Answers-water
.what does Na1+(aq) mean - Answers-.1 moles of Ba(NO3)2 in one liter of solution
it is its molarity or the solution concentration
.what do you call the force needed to overcome the interparticle attractions and"break
through" the surface of a liquid? - Answers-surface tension
.explain how a meniscus is formed in a thin glass tube - Answers-because of the strong
surface tension
.explain why water beads up and why insects or leaves can "float" on water - Answers-
because hydrogen in water are strong and form a "surface"
.how does a "diluted" solution compare to a concentrated solution - Answers-diluted is
low molarity, concentration is high molarity
.how does a saturated solution compare to a unsaturated solution - Answers-saturated
is full, unsaturated can hold more
.what is it called when a solution has more than the usual maximum amount of solute. is
this solution stable or unstable - Answers-supersaturated makes it unstable
.what is an excellent solvent for many solutions - Answers-water
.what does molarity mean? What is the formula for finding Molarity? what is the symbol
for molarity - Answers-molarity is the concentration of a solution
.explain the process of osmosis - Answers-is the process where solvent molecules
move through a semipermeable membrane from a dilute solution into a more
concentrated solution
.what generally increases the solubility of solid solutes in water? what decreases
solubility - Answers-increasing temp increases solubility and decreasing temp
decreases solubility
.this type of mixture has particles that are larger than those in solutions and are,
therefore, cloudy in appearance - Answers-colloid is cloudy in appearance because the
particles in the solution are larger
Updated Answers
how can you increase a solid substance solubility in a solution? - Answers-raise the
temperature
.This term/concept describes why grocers spray fruits and vegetables periodically to
make them look fresh - Answers-osmosis
.what is the reason why icy roads are sprayed with salt in the winter time - Answers-the
salt lowers the temperature at which the water on the roads will freeze "Freezing Point
Depression"
.what do we call the dip at the top of the water level in a graduated cylinder - Answers-
meniscus
.if the maximum amount of solute that can dissolve in 100 mL of water is 24 grams .
what would the solution be called if we forced 26 g of solute in it - Answers-
supersaturated
.this type of solution has particles floating at the top and settled at the bottom -
Answers-suspension
.this phenomenon occurs when a laser passes through a colloid and is also seen in the
path of light caused by your car's headlights on a foggy night - Answers-tyndall effect
.what is the intermolecular force that binds water and molecules together - Answers-
hydrogen bonds
.why won't water and oil mix - Answers-"like dissolve likes" water is polar and oil is non-
polar
.this type of mixture is cloudy - Answers-colloid
.why do cooks often add salt to their boiling water - Answers-the salt raises the
temperature at which water boils and makes the water hotter which cooks the food
faster
.the term describes the number of moles in a Liter of solution =moles/L - Answers-
molarity
.this type of solution does not hold the maximum amount of solute that a certain amount
of solvent can hold - Answers-unsaturated
, .when most solutes are dissolved, heat is absorbed. what type of reaction is this -
Answers-endothermic
.what is an excellent solvent for most solutes - Answers-water
.what does Na1+(aq) mean - Answers-.1 moles of Ba(NO3)2 in one liter of solution
it is its molarity or the solution concentration
.what do you call the force needed to overcome the interparticle attractions and"break
through" the surface of a liquid? - Answers-surface tension
.explain how a meniscus is formed in a thin glass tube - Answers-because of the strong
surface tension
.explain why water beads up and why insects or leaves can "float" on water - Answers-
because hydrogen in water are strong and form a "surface"
.how does a "diluted" solution compare to a concentrated solution - Answers-diluted is
low molarity, concentration is high molarity
.how does a saturated solution compare to a unsaturated solution - Answers-saturated
is full, unsaturated can hold more
.what is it called when a solution has more than the usual maximum amount of solute. is
this solution stable or unstable - Answers-supersaturated makes it unstable
.what is an excellent solvent for many solutions - Answers-water
.what does molarity mean? What is the formula for finding Molarity? what is the symbol
for molarity - Answers-molarity is the concentration of a solution
.explain the process of osmosis - Answers-is the process where solvent molecules
move through a semipermeable membrane from a dilute solution into a more
concentrated solution
.what generally increases the solubility of solid solutes in water? what decreases
solubility - Answers-increasing temp increases solubility and decreasing temp
decreases solubility
.this type of mixture has particles that are larger than those in solutions and are,
therefore, cloudy in appearance - Answers-colloid is cloudy in appearance because the
particles in the solution are larger
