CHM113 FINAL EXAM (UNIVERSITY OF
MIAMI)QUESTIONS & ANSWERS 100%
CORRECT
The Chemistry Department enforces a _____ _______ policy regarding lab safety
violations. - ANSWERzero tolerance
How should you be dressed in lab? - ANSWER1. Approved eye protection must be
worn in lab at all times
2. Full length pants and closed toe shoes
3. Cover midsection
What is the policy on food and drink in the lab? - ANSWERNone is allowed. This
includes gum.
Who must be present for students to enter the lab? - ANSWERThe TA
How did we find the freezing point? - ANSWERWe used a temperature probe to
detect the change in temperature as the lauric acid went from a liquid to a solid.
Where on the graph can you find the freezing point? - ANSWERIt is the flat portion of
the graph.
Why is the freezing point flat on the graph? - ANSWERBecause energy is being
used to rearrange the molecules instead of changing temperature.
What kind of experiments can be performed? - ANSWEROnly authorized
experiments under the supervision of the TA
What should you do if in the case of injury? - ANSWEREven if it is minor, treat it with
first aid and have another student notify the TA immediately of the injury.
How hot can a hot plate get and what should it be set at? - ANSWERThey can
exceed 550 C and should never be set past 3.
Where do you dispose of chemical waste? - ANSWERIn appropriately marked waste
bottles.
What do you do if you spill something? - ANSWERMake sure to clean it up
immediately. Use sodium bicarbonate for acid spills and boric acid with water for
base spills.
What is the purpose of LabPro/LoggerPro? - ANSWERThe program makes lab
measurements simpler and more accurate by using a computer to aid in data
collection.
, Freezing point is the same as ________ _______. - ANSWERMelting point
At what temperature does lauric acid freeze? - ANSWER43.5 C
When does supercooling happen? - ANSWERRight before the freezing point.
What is supercooling? - ANSWERIt is when a substance drops suddenly to below its
freezing point before going up to the freezing point.
What is density? - ANSWERThe ratio of its mass to its volume. D=m(g)/v(mL)
What waste product does the production adipic acid produce? - ANSWERN2O which
is greenhouse gas and the reason that people to recycle adipic acid after it has been
used to do things like clean up waste piles.
Why is it advantageous to us that adipic acid is very soluble in boiling water? -
ANSWERBecause that allows for recrystallization. When a compound begins to form
crystals, the impurities are left out.
Why is the adipic acid brown to start with? - ANSWERThe brown color is from the
impurities. These can be absorbed with activated charcoal.
Is density an intensive or extensive property? - ANSWERIntensive
At what temperature is water most dense? - ANSWER4 C
What is specific gravity? - ANSWERThe ratio of the density of something to the
density of water (at 4 C).
What three methods did we use to determine density? - ANSWER1. Take a block
and measure its dimensions to find its volume. Then weigh the block to find its mass.
Now you can find density.
Weigh a cylinder to find its mass. Now use the formula V=pir^2h to find volume. Now
you can find density.
2. Weigh a rock in air and record. Now weigh the rock while it is totally submerged in
water and record the value. Find the difference between the two to get the mass of
the water displaced. You have the mass of the rock and the mass of the displaced
water. You know the density of water (1 g/mL). Find the volume of the displaced
water. This is equal to the volume of the rock. Now you can find density.
3. Add 3 mL of two solutions of calcium chloride each to separate test tubes. Add a
piece of plastic to the more concentrated of the solutions. Slowly add some of the
dilute solution. After each addition stir. Eventually it will levitate. Now weigh an empty
beaker. Add 8 mL of the solution to the beaker and weigh again. The difference
between the two is the mass of the solution. Now you can find density.
What is the molecular formula for adipic acid? - ANSWERH2C6H8O4
What is adipic acid used for? - ANSWERFood flavorings, the synthesis of nylon-6,6.
MIAMI)QUESTIONS & ANSWERS 100%
CORRECT
The Chemistry Department enforces a _____ _______ policy regarding lab safety
violations. - ANSWERzero tolerance
How should you be dressed in lab? - ANSWER1. Approved eye protection must be
worn in lab at all times
2. Full length pants and closed toe shoes
3. Cover midsection
What is the policy on food and drink in the lab? - ANSWERNone is allowed. This
includes gum.
Who must be present for students to enter the lab? - ANSWERThe TA
How did we find the freezing point? - ANSWERWe used a temperature probe to
detect the change in temperature as the lauric acid went from a liquid to a solid.
Where on the graph can you find the freezing point? - ANSWERIt is the flat portion of
the graph.
Why is the freezing point flat on the graph? - ANSWERBecause energy is being
used to rearrange the molecules instead of changing temperature.
What kind of experiments can be performed? - ANSWEROnly authorized
experiments under the supervision of the TA
What should you do if in the case of injury? - ANSWEREven if it is minor, treat it with
first aid and have another student notify the TA immediately of the injury.
How hot can a hot plate get and what should it be set at? - ANSWERThey can
exceed 550 C and should never be set past 3.
Where do you dispose of chemical waste? - ANSWERIn appropriately marked waste
bottles.
What do you do if you spill something? - ANSWERMake sure to clean it up
immediately. Use sodium bicarbonate for acid spills and boric acid with water for
base spills.
What is the purpose of LabPro/LoggerPro? - ANSWERThe program makes lab
measurements simpler and more accurate by using a computer to aid in data
collection.
, Freezing point is the same as ________ _______. - ANSWERMelting point
At what temperature does lauric acid freeze? - ANSWER43.5 C
When does supercooling happen? - ANSWERRight before the freezing point.
What is supercooling? - ANSWERIt is when a substance drops suddenly to below its
freezing point before going up to the freezing point.
What is density? - ANSWERThe ratio of its mass to its volume. D=m(g)/v(mL)
What waste product does the production adipic acid produce? - ANSWERN2O which
is greenhouse gas and the reason that people to recycle adipic acid after it has been
used to do things like clean up waste piles.
Why is it advantageous to us that adipic acid is very soluble in boiling water? -
ANSWERBecause that allows for recrystallization. When a compound begins to form
crystals, the impurities are left out.
Why is the adipic acid brown to start with? - ANSWERThe brown color is from the
impurities. These can be absorbed with activated charcoal.
Is density an intensive or extensive property? - ANSWERIntensive
At what temperature is water most dense? - ANSWER4 C
What is specific gravity? - ANSWERThe ratio of the density of something to the
density of water (at 4 C).
What three methods did we use to determine density? - ANSWER1. Take a block
and measure its dimensions to find its volume. Then weigh the block to find its mass.
Now you can find density.
Weigh a cylinder to find its mass. Now use the formula V=pir^2h to find volume. Now
you can find density.
2. Weigh a rock in air and record. Now weigh the rock while it is totally submerged in
water and record the value. Find the difference between the two to get the mass of
the water displaced. You have the mass of the rock and the mass of the displaced
water. You know the density of water (1 g/mL). Find the volume of the displaced
water. This is equal to the volume of the rock. Now you can find density.
3. Add 3 mL of two solutions of calcium chloride each to separate test tubes. Add a
piece of plastic to the more concentrated of the solutions. Slowly add some of the
dilute solution. After each addition stir. Eventually it will levitate. Now weigh an empty
beaker. Add 8 mL of the solution to the beaker and weigh again. The difference
between the two is the mass of the solution. Now you can find density.
What is the molecular formula for adipic acid? - ANSWERH2C6H8O4
What is adipic acid used for? - ANSWERFood flavorings, the synthesis of nylon-6,6.
