Exam (elaborations)
CHM113
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Exam of 19 pages for the course BCH 462 Urea Cycle, Fatty Acid Synthesis at BCH 462 Urea Cycle, Fatty Acid Synthesis (CHM113)
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CHM113Density - CORRECT ANSWER-Ratio of Mass to Volume
Physical property - CORRECT ANSWER-Can be observed without changing the
matter
Intensive property - CORRECT ANSWER-Independent of the amount of matter
(density, color)
Extensive Property - CORRECT ANSWER-Depends on the amount of matter
(mass, volume)
At what state and temperature is water most dense? - CORRECT
ANSWER-Liquid, 4
Can extensive properties impact intensive ones? - CORRECT ANSWER-Yes.
Freezing of a balloon decreases the volume.
Order the states from most dense to least dense - CORRECT
ANSWER-solid>liquid>gas
specific gravity - CORRECT ANSWER-ratio of the density of the substance to the
density of water
What information must be included with specific gravity? - CORRECT
ANSWER-Temperature
What is water's maximum density? - CORRECT ANSWER-1.00g/mL
Where else is density important? - CORRECT ANSWER-Rock formations
For a piece of wood with L=10.35cm, W=6.42cm, H=1.90cm, and mass=72.412g
calculate density - CORRECT ANSWER-0.574 g/cm^3
Calculate Density: A cylinder has d=1.28, h=3.85, mass=39.730g - CORRECT
ANSWER-8.02 g/cm^3
,A rock weighs 143g in air, 82g in water. What is the mass of H2O displaced,
Volume of H2O displaced, Density of the rock? - CORRECT
ANSWER-61g,61mL,2.3g/mL
A graduated cylinder weighs 28.102g. A solution has been created which
levitates a piece of PVC. The graduated cylinder containing 6.25mL of that
solution weighs 34.200g. What is the density of the solution and the PVC
suspended in it? - CORRECT ANSWER-0.976g/mL
Give the equation of specific gravity - CORRECT ANSWER-density of
substance/density of water
What are the units of specific gravity? - CORRECT ANSWER-None
To find the density of PVC, you will add dilute calcium chloride to concentrated
calcium chloride. The PVC will _____ when the density of the PVC matches the
density of the solution. - CORRECT ANSWER-Levitate
The mass of a rock in air is 0.215kg. When the rock is lowered in to water, its
mass is 0.187kg. What is the volume of the displaced water(mL) and the density
of the rock? - CORRECT ANSWER-28mL,7.7g/cm^3
Calculate the density of the metal cylinder
m=927.80mg
r=1.80cm
h=6.32cm - CORRECT ANSWER-0.0144g/cm^3
What is the difference between density and specific gravity? - CORRECT
ANSWER-Density is the ratio of mass to volume of a substance. Specific gravity
is the density of a substance divided by the density of a reference substance
(usually water at 4 degrees)
Units of density? - CORRECT ANSWER-g/cm^3
Why do some things have a high density and others have a low density? -
CORRECT ANSWER-In some materials, matter is packed more closely together
, so there is more of it per unit volume. In other materials, the kinetic energy of the
atoms may be faster so they move more and take up more volume.
Why is density an important physical property? - CORRECT ANSWER-It is an
intrinsic property so it can be used to identify a substance.
Which determination of density has the highest error? - CORRECT
ANSWER-The spring scale. It was the hardest to read and varied the most in
measurements.
Which do you think had the lowest error? - CORRECT ANSWER-The
measurement of the metal cylinder. Only two ruler measurements were taken.
What is the conversion from cm^3 to mL? - CORRECT ANSWER-1cm^3=1mL
One cm^3 us a cube. The amount of a substance that fills that cube is equivalent
to one mL.
Why do ice cubes float in water? - CORRECT ANSWER-Ice cubes have a
crystalline structure with a low density(the water molecules are a fixed distance
apart). Liquid water is more tightly packed than this distance so it has a higher
density than ice.
What is the molecular formula of adipic acid? - CORRECT ANSWER-H2C6H8O4
What is adipic acid used for? - CORRECT ANSWER-food flavorings, synthesis of
nylon6-6, upholstery, carpet fibers, clothing, tire reinforcements, and auto parts
What is the industrial production of adipic acid per year? - CORRECT
ANSWER-2.2 million tons
What does most of the industrial acid synthesis in the world currently rely on? -
CORRECT ANSWER-nitric acid oxidation of compounds like cyclohexanol and
cyclohexanone
What are the dangers of using nitric acid oxidation? - CORRECT ANSWER-It
produces N2O which is a greenhouse gas and is thought to contribute to global
warming, ozone depletion, and acid rain
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