Fort Chem On-line Quiz - Introduction
1
For most substances the volume of a mass of a gas is
-- Choose an answer --
much larger than an equal mass of the liquid.
slightly larger than an equal mass of the liquid.
much smaller than an equal mass of a liquid.
the same as an equal of a liquid.
2
When 10 g of Liquid A is mixed with 40 g of Liquid B the resulting solution has a density of 1.4 g/mL. What conclusion is true?
-- Choose an answer --
The density of Liquid A is greater than the density of Liquid B.
The density of Liquid B is greater than the density of Liquid A.
Both liquids are more dense than water.
At least one of the liquids is more dense than water.
Neither liquid is more dense than water.
3
What is the density of a metal if a 15.4 g sample has a volume of 1.96 cm^3?
-- Choose an answer --
0.511 g/cm^3
0.127 g/cm^3
7.86 g/cm^3
30.2 g/cm^3
32.1 g/cm^3
4
The density of aluminum is 2.70 g/cm^3. If a cube of aluminum weighs 13.5 g, what is the length of the edge of the cube?
-- Choose an answer --
5.00 cm
1.71 cm
1.25 cm
0.200 cm
0.312 cm
5
How many significant figures are in the expression 2.430 x10^2 g?
-- Choose an answer --
3
4
5
6
7
6
When a pure solid substance was heated, a student obtained another solid and a gas, each of which was a pure substance. From
this information which of the following statements is ALWAYS a correct conclusion?
-- Choose an answer --
The original solid is not an element.
Both products are elements.
The original solid is a compound and the gas is an element.
The original solid is an element and the gas a is a compound.
Both products are compounds.
7
Which of the following is a physical combination of two or more pure substances?
-- Choose an answer --
salt
air
sand
water
natural gas
8
To what category would a sample containing two substances and one phase belong?
-- Choose an answer --
compound
element
diatomic molecules
homogeneous mixture
heterogeneous mixture
9
Brass is a mixture of two metals, copper and zinc. How many g of zinc are present in a 125 kg sample of a brass alloy containing
66% copper and 34% zinc?
-- Choose an answer --
2.4 g
43 g
83 g
4.3 x10^4 g
2.4 x10^4 g
10
Which of the following compounds is 36.8% nitrogen?
-- Choose an answer --
N2O
NO
N2O3
N2O4
N2O5
11
All of the compounds listed below have a molar mass of 240 amu. Which of the listed compounds could have an empirical
formula with a mass of 80 amu?
-- Choose an answer --
C14H8O4
C10H8OS3
C15H12O3
C12H18O4N
C6H8Br2
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