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General Chemistry II test
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gen. chemistry II test
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Pheromones are compounds secreted by females ofmany insect species to attract mates. Typically,
1.0 x 108 g of a pheromone is sufficient to reach all
targeted males within a radius of 0.50 mi. Calculate
the density of the pheromone (in grams per liter) in a
cylindrical air space having a radius of 0.50 mi and a
height of 40 ft.
A human brain weighs about 1 kg and contains about
1011 cells. Assuming that each cell is completely
filled with water (density 5 1 g/mL), calculate the
length of one side of such a cell if it were a cube.
If the cells are spread out in a thin layer that is a
single cell thick, what is the surface area in square
meters?
Bronze is an alloy made of copper (Cu) and tin (Sn).
Calculate the mass of a bronze cylinder of radius
6.44 cm and length 44.37 cm. The composition of
the bronze is 79.42 percent Cu and 20.58 percent Sn
and the densities of Cu and Sn are 8.94 g/cm3 and
7.31 g/cm3, respectively.
A chemist mixes two liquids A and B to form a homogeneous
mixture. The densities of the liquids are
2.0514 g/mL for A and 2.6678 g/mL for B. When she
drops a small object into the mixture, she finds that the
object becomes suspended in the liquid; that is, it neither
sinks nor fl oats. If the mixture is made of 41.37
percent A and 58.63 percent B by volume, what is the
density of the metal? Can this procedure be used in
general to determine the densities of solids? What assumptions
must be made in applying this method?
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