AnswersChemistryChemical Reactions and Stoichiometry

Chemical Reactions and Stoichiometry — Test Answers

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Which statement can best be concluded from the ideal gas law?

A
All collisions between atoms or molecules are perfectly elastic and are not the result of any attractive forces.
B
The product of pressure and volume of an ideal gas is proportional to the absolute temperature.
C
The behavior of a gas under real conditions does not obey the ideal gas law.
D
The temperature, pressure, and volume of a gas are all related.
6

Consider the balanced equation. 2 cap h sub 2 cap s plus 3 cap o sub 2 rightarrow 2 SO sub 2 plus 2 cap h sub 2 cap o Which option gives the correct mole ratios?

A
cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 2 to 2 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 3 to 2
B
cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 2 to 3 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 3 to 2
C
cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 4 to 4 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 5 to 4
D
cap h sub 2 ratio of cap s to SO sub 2 is equal to ratio of 4 to 6 and ratio of cap o sub 2 to cap h sub 2 cap o is equal to ratio of 4 to 4
9

What is the word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide?

A
magnesium oxide plus oxygen rightarrow magnesium
B
magnesium plus oxygen rightarrow magnesium oxide
C
magnesium plus oxygen rightarrow magnesium plus oxygen
D
magnesium plus magnesium oxide rightarrow oxygen
10

Which clue can be used to identify a chemical reaction as a decomposition reaction?

A
The reaction has a single reactant.
B
The reaction involves oxygen.
C
The reaction involves ions.
D
The reaction has a single product.
11

Which statement best describes a mole?

A
It is used mainly for writing chemical formulas.
B
It is used for chemical equations that have reversible reactions.
C
It is used mainly for dealing with fluid substances.
D
It is used for directly comparing the amounts of substances.
12

Which best defines partial pressure in a mixture of gases?

A
pressure that is exerted by one gas as if it occupied a container by itself
B
sum of the individual pressures that are exerted by two or more gases
C
pressure that is exerted by all the gases of a mixture on the container
D
half of the pressure that is exerted by the gases of a mixture on the container
14

Avogadro’s number was calculated by determining the number of atoms in

A
12 point 0 0 g of carbon- 12 .
B
14 point 0 0 g of oxygen.
C
12 point 0 0 g of oxygen.
D
14 point 0 0 g of carbon- 12 .
16

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?

A
the molar amount of the gas
B
the molar mass
C
the partial pressure of the gas
D
the standard temperature and pressure
22

Which statement correctly describes the actual yield and the theoretical yield of a reaction?

A
The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for each instance of a reaction.
B
The actual yield is calculated from the amount of the limiting reactant, and the theoretical yield is calculated from the amount of the excess reactant.
C
The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
D
The actual yield represents the maximum yield possible, and the theoretical yield assumes perfect reaction conditions.

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