When the equation below is balanced, the coefficient of sulfuric acid, H2SO4 is:
NaCN + H2SO4 → Na2SO4 + HCN
A) 3
B) 4
C) 1
D) 2
1
The pH =
... [Show More] -log[H+] for a solution. The pOH = -log[OH-] for a solution. The pH and
pOH are
related, and their sum is equal to 14 (pH + pOH = 14). If the concentration of a dilute
solution of
potassium hydroxide is 0.001 M, what is the pH of that solution?
A) 11
B) 7
C) 3
D) 2
11
Which of the following is NOT a postulate of the kinetic-molecular theory?
A) If two molecules collide with each other, the total energy of the molecules before
the collision
is the same as their total energy after the collision.
B) The molecules of a gas are strongly attracted to each other.
C) Molecules of a gas move rapidly and in straight lines.
D) The molecules in a gas are tiny compared to the distance between them.
b
Ammonia can be prepared by the reaction of magnesium nitride with water. The
products are
ammonia and magnesium hydroxide. When the equation is written and balanced, the
coefficient
of ammonia is
A) 3.
B) 6.
C) 2.
D) 1.
2
When a phosphorus atom combines with hydrogen to form a molecule, how many
bonds are
formed?
A) 4
B) 3
C) 1
D) 2
3
How many liters of a 0.2 M HCl solution are needed in order to have 1.0 moles of
HCl?
A) 8 L
B) 0.8 L
C) 0.2 L
D) 5 L
0.2 L
Rain with which of the following pH of values would be considered to be acid rain?
A) 1.5
B) 7
C) 9.0
D) 9.5
1.5
In the balanced chemical reaction for the neutralization of sodium hydoxide with
sulfuric acid,
H2SO4, the coefficient of water is
A) 3.
B) 4.
C) 2.
D) 1.
2
Propane (C3H8 ) reacts with oxygen (O2) to form carbon dioxide (CO2) and water
(H2O). When
the equation below is balanced, the coefficient of water is:
C3H8 + O2 → CO2 + H2O
A) 1
B) 3
C) 2
D) 4
4
A gas is enclosed in a cylinder fitted with a piston. The volume of the gas is 5.00 L at
0.500 atm
pressure. The piston is moved to increase the volume to 3.00 L. Which of the
following is a
reasonable value for the pressure of the gas at the greater volume?
A) 0.833 atm
B) 0.300 atm
C) 0.0333 atm
D) 30.0 atm
0.833 atm
Which of the following ingredients would NOT be an active ingredient in an antacid?
A) Mg(OH)2
B) NaHCO3
C) CaCO3
D) HCl
HCl
Which one of the following compounds does NOT obey the ʺoctet ruleʺ?
A) NH3
B) SF6
C) CH4
D) H2O
SF6
A balloon is inflated outdoors on a cold day in North Dakota at a temperature of -
30°C to a
volume of 4.0 L. The pressure remains constant. What is the volume of the balloon
indoors at a
temperature of 25°C?
A) 5.4 L
B) 2.4 L
C) 4.9L
D) 3.2 L
4.9L
What mass of KOH is needed to make 400 mL of 0.725 M KOH?
A) 40.6 g
B) 101.7 g
C) 16.3 g
D) 31.0 g
16.3 g
The number of electrons contained in several molecules and ions is shown below.
Which of the
following is most likely to be a free radical?
A) 13
B) 16
C) 12
D) 18
13
Acetylene (C2H2) burns in pure oxygen with a very hot flame. The products of this
reaction are
carbon dioxide and water. How much oxygen is required to react with 52.0 g of
acetylene?
A) 240.0 g
B) 32.0 g
C) 160.0 g
D) 52.0 g
160.0 g
Calcium metal reacts with water to form calcium hydroxide and hydrogen gas. How
many grams
of hydrogen are formed when 0.50 g of calcium are added to water?
A) 0.025 g
B) 0.050 g
C) 0.10 g
D) 0.50 g
0.025 g
If the concentration of a dilute solution of nitric acid is 0.0001 M, what is the pH of
that solution?
A) 4 [Show Less]