Exam (elaborations)
Chem 1020.
- Module
- Biology 101
- Institution
- Biology 101
Exam of 5 pages for the course Biology 101 at Biology 101 (Chem 1020.)
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Chem 1020How would a gas differ from a liquid with respect to density? - ANS-a gas is much less
dense because most of the volume of a gas is empty space
How would a gas differ from a liquid with respect to compressibility? - ANS-Gas is more
compressible because of the distance between molecules
How would a gas differ from a liquid with respect to ability to mix substances of the
same phase to form homogeneous mixtures? - ANS-Gaseous molecules are so far
apart that there is no barrier to mixture. Liquid molecules touch each other so they need
to be similar to displace.
Both a liquid and a gas are moved to larger containers. How does their behavior differ?
Explain the difference on molecular terms - ANS-The attractive forces of a liquid hold it
together in same volume, while gas are far apart and fill up whole container.
Although water and carbon tetrachloride, CCl4(l), do not mix, their vapors form
homogeneous mixtures. Explain. - ANS-Vapors form homogeneous mixture because all
vapors are homogenous. Liquid state too dissimilar.
The densities of gases are generally reported in units of g/L, whereas those for liquids
are reported as g/mL. Explain the molecular basis for this difference. - ANS-Using the
small amount of gas would give such a small molecular amount of the gas. 1mL would
be way too small.
Consider two people of the same mass standingin a room. One person is standing
normally, and the other is standing on one foot. A. Does one person exert a greater
force on the floor than the other? B. Does one person exert a greater pressure on the
floor than the other? - ANS-A. F=ma, both people have the same mass and have
experience of gravity, force would be hte same
B. P = F/A, person standing on one foot is imposing on a smaller area, so the pressure
would be greater.
Why do aerosol cans explode if heated? - ANS-Heating the can will increase the
pressure of the gas inside the can, As pressure increases, it may be enough to rupture
the can.
, Why can you drink through a soda straw? - ANS-As you draw a vacuum in your mouth,
atmospheric pressure pushing on the surface of the liquid up the straw
Why does a thin walled can collapse when air inside is removed by a vacuum pump -
ANS-The external atmospheric pressure pushes on the can. Since there is no opposing
pressure from the air inside, the can collapses.
Why do manufacturers produce different types of tennis balls for high and low
elevations? - ANS-How "hard" the tennis ball is depends on diff b/t pressure of air inside
tennis ball and atmospheric pressure. A "sealevel" ball will be much harder at high
altitude since external pressure is lower at high altitude. A "high altitude" ball will be
"soft" at sea level.
Explain why the height of mercury is independent of the diameter of the mercury
column. - ANS-in mathematical terms, P = d h a , A gets cancelled in creating this
equation, pressure is independent of area.
Open Mercury barometer, mercury is higher closer to apparatus, do u add or subtract
the h? - ANS-add
Open Mercury barometer, mercury is higher closer to apparatus, do u add or subtract
the h? - ANS-subtract
Define the term partial pressure. State Dalton's law of partial pressures. - ANS-Partial
pressure is pressure exerted by a single component of a gaseous mixture. Total
pressure of mixture is equal to sum of individual pressures the gases would exert if
present in same container alone.
Can the partial pressures of the components of an enclosed mixture of gases be
measured with a manometer? If not, how are the partial pressures determined? -
ANS-No, only the total pressure can be measured. but partial pressures is directly
related to moles of gas in the mixture. can be found with stoichiometry.
Consider a mixture of two gases, A and B, confined to a close vessel. A quantity of a
third gas, C, is added to the same vessel at the same temperature.How does the
addition of gas C affect the partial pressure of the gas - ANS-the partial pressure of the
gas would not be affected, partial pressure of a and b are defined by moles of each.
Consider a mixture of two gases, A and B, confined to a close vessel. A quantity of a
third gas, C, is added to the same vessel at the same temperature.How does the
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