CHM 113 FINAL QUESTIONS &
ANSWERS 100% CORRECT
Density - ANSWERRatio of a substance's mass to its volume
Is density a physical or chemical property? - ANSWERPhysical
Is density an intensive or extensive property? - ANSWERIntensive
Intensive property - ANSWERDoesn't depend on the "size" of the sample
Pure substance - ANSWERHas a consistent, invariant set of physical properties
including the density
Density - ANSWERDescribes how the atoms or molecules of a substance are
arranged in space
Specific gravity - ANSWERThe ratio of the density of a substance to the density of
water
Density depends on - ANSWERTemperature
Why do we leave the filtrate undisturbed in an ice bath? - ANSWERTo obtain larger
crystals
The melting point of an impure compound is ____ and ____ than the literature value
of the pure compound. - ANSWERLower and broader.
What is adipic acid used for? - ANSWERProduction of nylon
What does the graph of temperature vs. solubility look like for adipic acid? -
ANSWERExponential curve
Why should the adipic acid should be poured quickly down the side? - ANSWERSo,
the adipic acid does not begin to crystallize.
Why is density an important physical property? - ANSWERIt is an intensive property
that identifies substances.
Is color an intensive or extensive property? - ANSWERIntensive
Do things "weigh" more or less in water? - ANSWERLess
How did we measure the density of PVC? - ANSWERWe measured it indirectly by
levitating it in a solution of the same density. First, we put the piece of plastic into the
dilute solution, fished it out and put it into the concentrated solution, before adding
drops of the dilute solution to the concentrated solution with the piece of plastic in it.
, What solution did we use to measure the density of the PVC? - ANSWERCalcium
chloride
Order of densities in general (from most to least) - ANSWERSolids-liquids-gases
Order of densities for water (from most to least) - ANSWERLiquids-solids-gas
Will the plastic sink or float in the dilute solution? - ANSWERSink
Will the plastic sink or float in the concentrated solution? - ANSWERFloat
Formula for adipic acid - ANSWERH2C6H8O4
What is the harmful waste emission that comes from industrial adipic acid synthesis?
- ANSWERN20
What property of adipic acid are we using to separate it from impurities? -
ANSWERSolubility
What is the technique being used to purify the crude adipic acid? - ANSWERRe-
crystallization
Why are we using fluted filter paper? - ANSWERTo increase the surface area (which
will in turn increase the contact with the solution, and increase the rate of filtration)
Why do we add activated charcoal to the boiling solution? - ANSWERTo remove the
carbon compounds and the other impurities
Why do we pour from the side of the E-flask? - ANSWERSteam rising from the
mouth of the flask can burn your hand if it is over the flask opening. Also, pouring
directly into the center of the filter paper will cause it to break.
Qualitative analysis - ANSWERExamining a substance to find out what compounds
or elements are present in the substance
Quantitative analysis - ANSWERExamining a substance to find out how much of a
particular compound or element is present in the sample
What are the two methods of quantitative analysis? - ANSWERConductimetric
titration and gravimetric determination
Write a balanced equation for barium hydroxide and sulfuric acid. - ANSWERyou can
do this.
Gravimetric determination - ANSWERQuantitative analysis by weight usually
involving the weighing of precipitaiton
Why does the total number of dissociated ions in the solution decrease? -
ANSWERDue to the formation of the precipitate.
ANSWERS 100% CORRECT
Density - ANSWERRatio of a substance's mass to its volume
Is density a physical or chemical property? - ANSWERPhysical
Is density an intensive or extensive property? - ANSWERIntensive
Intensive property - ANSWERDoesn't depend on the "size" of the sample
Pure substance - ANSWERHas a consistent, invariant set of physical properties
including the density
Density - ANSWERDescribes how the atoms or molecules of a substance are
arranged in space
Specific gravity - ANSWERThe ratio of the density of a substance to the density of
water
Density depends on - ANSWERTemperature
Why do we leave the filtrate undisturbed in an ice bath? - ANSWERTo obtain larger
crystals
The melting point of an impure compound is ____ and ____ than the literature value
of the pure compound. - ANSWERLower and broader.
What is adipic acid used for? - ANSWERProduction of nylon
What does the graph of temperature vs. solubility look like for adipic acid? -
ANSWERExponential curve
Why should the adipic acid should be poured quickly down the side? - ANSWERSo,
the adipic acid does not begin to crystallize.
Why is density an important physical property? - ANSWERIt is an intensive property
that identifies substances.
Is color an intensive or extensive property? - ANSWERIntensive
Do things "weigh" more or less in water? - ANSWERLess
How did we measure the density of PVC? - ANSWERWe measured it indirectly by
levitating it in a solution of the same density. First, we put the piece of plastic into the
dilute solution, fished it out and put it into the concentrated solution, before adding
drops of the dilute solution to the concentrated solution with the piece of plastic in it.
, What solution did we use to measure the density of the PVC? - ANSWERCalcium
chloride
Order of densities in general (from most to least) - ANSWERSolids-liquids-gases
Order of densities for water (from most to least) - ANSWERLiquids-solids-gas
Will the plastic sink or float in the dilute solution? - ANSWERSink
Will the plastic sink or float in the concentrated solution? - ANSWERFloat
Formula for adipic acid - ANSWERH2C6H8O4
What is the harmful waste emission that comes from industrial adipic acid synthesis?
- ANSWERN20
What property of adipic acid are we using to separate it from impurities? -
ANSWERSolubility
What is the technique being used to purify the crude adipic acid? - ANSWERRe-
crystallization
Why are we using fluted filter paper? - ANSWERTo increase the surface area (which
will in turn increase the contact with the solution, and increase the rate of filtration)
Why do we add activated charcoal to the boiling solution? - ANSWERTo remove the
carbon compounds and the other impurities
Why do we pour from the side of the E-flask? - ANSWERSteam rising from the
mouth of the flask can burn your hand if it is over the flask opening. Also, pouring
directly into the center of the filter paper will cause it to break.
Qualitative analysis - ANSWERExamining a substance to find out what compounds
or elements are present in the substance
Quantitative analysis - ANSWERExamining a substance to find out how much of a
particular compound or element is present in the sample
What are the two methods of quantitative analysis? - ANSWERConductimetric
titration and gravimetric determination
Write a balanced equation for barium hydroxide and sulfuric acid. - ANSWERyou can
do this.
Gravimetric determination - ANSWERQuantitative analysis by weight usually
involving the weighing of precipitaiton
Why does the total number of dissociated ions in the solution decrease? -
ANSWERDue to the formation of the precipitate.
