Chemical Quantities
Practice Test
1.
A ____________ reaction is one in which one element takes the place of another in a compound.
a.
synthesis
b.
single displacement
c.
decomposition
d.
double displacement
2.
According to the equation 2HBr + Na
2
CO
3
NaBr + H
2
O + CO
2
, what volume of CO
2
at 1.230 atm and 325 K is produced by 50.0 g of HBr reacting with an excess of Na
2
CO
3
?
a.
6.70 L
b.
50.0 L
c.
1.52 L
d.
22.4 L
3.
In general, electronegativity ___________ atomic number within a period.
a.
decreases with
b.
remains constant with
c.
increases with
d.
is inversely proportional to
4.
A substance that increases the rate of a chemical reaction without being permanently changed or consumed is called ______________.
a.
a product
b.
a reactant
c.
an equilibrate
d.
a catalyst
5.
This type of chemical reaction has energy written as a product.
a.
exothermic
b.
light-absorbing
c.
energy-absorbing
d.
endothermic
6.
The number of things in one mole is the ________________.
a.
kilogram
b.
Avogadro constant
c.
atomic mass unit
d.
gram
7.
What is the volume of 44.6 L of CO
2
initially at 455 K and 3.66 atm when the conditions change to STP?
a.
682 L
b.
22.4 L
c.
0.557 L
d.
97.9 L
8.
What is the percent boron by mass in boric acid, H
3
BO
3
?
a.
22.10%
b.
45.30%
c.
17.50%
d.
38.00%
9.
What is the frequency of yellow light , which has a wavelength of 5.56 x 10 -7 m?
a.
1.85 x 10 15 m/s
b.
5.40 x 10 14 Hz
c.
5.40 x 10 14 m/s
d.
1.85 x 10 15 Hz
10.
The distance between corresponding points on two consecutive waves is called _____________.
a.
speed
b.
frequency
c.
amplitude
d.
wavelength
11.
In the combined gas law, the _________________ is held constant.
a.
volume
b.
number of gas particles
c.
pressure
d.
temperature
12.
A description of a chemical reaction that includes the names of all reactants and products, but not the formulas, is called a ___________________.
a.
skeleton equation
b.
chemical equation
c.
word equation
d.
balanced equation
13.
How many atoms of carbon are in a pure sample of carbon having a mass of 72.0 g?
a.
4.33 x 10 25
b.
36 x 10 24
c.
3.6 x 10 24
d.
3.6 x 10 23
14.
Adding reactants causes an equilbrium to ______________.
a.
shift in both directions simultaneously
b.
shift to the left
c.
remain unchanged
d.
shift to the right
15.
What is the formula for sulfur trioxide?
a.
SO
3
2-
b.
SO
3
c.
S
3
O
d.
SO
16.
In aqueous solution, H
2
SO
4
is called _______________.
a.
sulfuric acid
b.
hydrogen sulfite
c.
nitric acid
d.
hydrogen sulfur oxide
17.
What type of reaction is represented by the equation 2Fe + 3Cl
2
2FeCl
3
?
a.
single displacement
b.
synthesis
c.
combustion
d.
decomposition
18.
Calcium atoms tend to react to form _______ ions.
a.
2+
b.
4-
c.
6-
d.
1+
19.
Which of these is NOT a binary compound?
a.
aluminum nitrate
b.
carbon dioxide
c.
potassium iodide
d.
water
20.
When strontium atoms react with oxygen atoms, they form __________ bonds.
a.
covalent
b.
triple
c.
polar covalent
d.
ionic
