CHM 113 FINAL EXAM QUESTIONS &
ANSWERS CORRECT 100%
Why is eye protection required in the lab? - ANSWERto protect your eyes from
harmful chemicals
What is the policy on doing unauthorized experiments in the lab? - ANSWERit is not
allowed
What is the laboratory dress code? - ANSWERclosed-toe shoes, long pants and
appropriate shirt
What is the policy regarding food and beverages in the lab? - ANSWERmust be
discarded before entering lab
What chemical compound is in the hoods and is used as a sweeping compound for
all spills? - ANSWERsodium bicarbonate / kitty litter
Qualitative Analysis - ANSWERchemical analysis to determine what
compounds/elements are present in a substance
Quantitative Analysis - ANSWERchemical analysis to determine how much of a
compound/element is present in a sample
Gravimetric Determination - ANSWERquantitative analysis measure based on the
mass of a solid
What should be done if you get acid or base on you? - ANSWERgo to the shower
and remove all clothing
Should a hotplate always be operated at the highest position? What is the max
setting? - ANSWERno; 3
Describe and sketch the plot of Temperature vs. Time for the evaporation of alcohol.
Why does the plot appear as it does? (explain any increases/decreases in
temperature)? - ANSWER- when you stick the probe in the alcohol, the temperature
is going to be at its highest point
- when the probe is removed, the temperature will immediately decrease and then
increase again until it has reached room temp
- then it will flatten and remain flat
Describe and sketch the plot of Temperature vs. Time for the freezing point of Lauric
Acid. Why does the plot appear as it does (there should be 3 important "sections" in
the plot, explain what is happening in each)? - ANSWER- in the first part of the
graph, or increase in temp, the probe is introduced to the hot temp of Lauric Acid in
its liquid state -- even though it has been introduced to cold water
, - in the middle of the graph, the melting point is identified as the flat line. this is
because the lauric acid has once again solidified
- soon though, the lauric acid temp begins to decrease to its freezing point
DENSITY - ANSWER...
Density - ANSWERmass divided by volume (d = m /v)
Specific Gravity - ANSWERthe ratio of the density of a substance to the density of
water
Intensive Property - ANSWERproperties independent of mass (ex: density, specific
heat, equivalent weight)
Extensive Property - ANSWERproperties dependent of mass (ex: volume and mass)
For a piece of wood having:
Length = 10.35 cm
Width = 6.42 cm
Height = 1.90 cm
Mass = 74.212 g
Calculate the density - ANSWERd = m / (lxwxh) = (74.212 g) / (10.35)*(6.42)*(1.90)
= 0.587 g/cm^3
What are the units of density? - ANSWERg/mL and g/cm^3
What are the units of specific gravity? - ANSWERit is unitless
You must bring your lab manual to every lab session - ANSWERTrue
Safety glasses can be removed once you are entering data in your lab notebook -
ANSWERFalse
You must wear full coverage shoes at all time in lab - ANSWERTrue
You are allowed to pipet out liquids by mouth - ANSWERFalse
You should use glass containers, such as beakers, to collect ice out of an ice
machine - ANSWERFalse
Liquid organic waste can go down the drain - ANSWERFalse
At what temperature is water most dense? what is its physical state at that
temperature and the numeric value for its density? - ANSWER4 degrees celsius,
liquid, 1 g/mL
What is the volume occupied by 10 g of Iron? DFe = 7.87 g/cm^3 - ANSWERd = 10
g / v; d = 7.87 g/cm^3 = 1.27 cm^3
Intensive (I) or Extensive (E) property?
ANSWERS CORRECT 100%
Why is eye protection required in the lab? - ANSWERto protect your eyes from
harmful chemicals
What is the policy on doing unauthorized experiments in the lab? - ANSWERit is not
allowed
What is the laboratory dress code? - ANSWERclosed-toe shoes, long pants and
appropriate shirt
What is the policy regarding food and beverages in the lab? - ANSWERmust be
discarded before entering lab
What chemical compound is in the hoods and is used as a sweeping compound for
all spills? - ANSWERsodium bicarbonate / kitty litter
Qualitative Analysis - ANSWERchemical analysis to determine what
compounds/elements are present in a substance
Quantitative Analysis - ANSWERchemical analysis to determine how much of a
compound/element is present in a sample
Gravimetric Determination - ANSWERquantitative analysis measure based on the
mass of a solid
What should be done if you get acid or base on you? - ANSWERgo to the shower
and remove all clothing
Should a hotplate always be operated at the highest position? What is the max
setting? - ANSWERno; 3
Describe and sketch the plot of Temperature vs. Time for the evaporation of alcohol.
Why does the plot appear as it does? (explain any increases/decreases in
temperature)? - ANSWER- when you stick the probe in the alcohol, the temperature
is going to be at its highest point
- when the probe is removed, the temperature will immediately decrease and then
increase again until it has reached room temp
- then it will flatten and remain flat
Describe and sketch the plot of Temperature vs. Time for the freezing point of Lauric
Acid. Why does the plot appear as it does (there should be 3 important "sections" in
the plot, explain what is happening in each)? - ANSWER- in the first part of the
graph, or increase in temp, the probe is introduced to the hot temp of Lauric Acid in
its liquid state -- even though it has been introduced to cold water
, - in the middle of the graph, the melting point is identified as the flat line. this is
because the lauric acid has once again solidified
- soon though, the lauric acid temp begins to decrease to its freezing point
DENSITY - ANSWER...
Density - ANSWERmass divided by volume (d = m /v)
Specific Gravity - ANSWERthe ratio of the density of a substance to the density of
water
Intensive Property - ANSWERproperties independent of mass (ex: density, specific
heat, equivalent weight)
Extensive Property - ANSWERproperties dependent of mass (ex: volume and mass)
For a piece of wood having:
Length = 10.35 cm
Width = 6.42 cm
Height = 1.90 cm
Mass = 74.212 g
Calculate the density - ANSWERd = m / (lxwxh) = (74.212 g) / (10.35)*(6.42)*(1.90)
= 0.587 g/cm^3
What are the units of density? - ANSWERg/mL and g/cm^3
What are the units of specific gravity? - ANSWERit is unitless
You must bring your lab manual to every lab session - ANSWERTrue
Safety glasses can be removed once you are entering data in your lab notebook -
ANSWERFalse
You must wear full coverage shoes at all time in lab - ANSWERTrue
You are allowed to pipet out liquids by mouth - ANSWERFalse
You should use glass containers, such as beakers, to collect ice out of an ice
machine - ANSWERFalse
Liquid organic waste can go down the drain - ANSWERFalse
At what temperature is water most dense? what is its physical state at that
temperature and the numeric value for its density? - ANSWER4 degrees celsius,
liquid, 1 g/mL
What is the volume occupied by 10 g of Iron? DFe = 7.87 g/cm^3 - ANSWERd = 10
g / v; d = 7.87 g/cm^3 = 1.27 cm^3
Intensive (I) or Extensive (E) property?
