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Stoichiometry Unit 9- 2
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Instructions: Answer all questions to get your test result.
1) Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
A
qualitative analysis
B
chemical kinetics
C
stoichiometry
D
entropy
2) What is the study of the mass relationships of elements in compounds?
A
Avogadro's principle
B
composition stoichiometry
C
percent yield
D
reaction stoichiometry
3) What is the study of the mass relationships among reactants and products in a chemical reaction?
A
composition stoichiometry
B
reaction stoichiometry
C
electron configuration
D
periodic law
4) Which of the following would be investigated in reaction stoichiometry?
A
the types of bonds that break and form when acids react with metals
B
the mass of potassium required to produce a known mass of potassium chloride
C
the masses of hydrogen and oxygen in water
D
the amount of energy released in chemical reactions
5) A determination of the masses and number of moles of sulfur and oxygen in the compound sulfur dioxide would be studied in
A
composition stoichiometry
B
chemical equilibrium.
C
reaction stoichiometry
D
chemical kinetics
6) Which of the following would NOT be studied in the branch of chemistry called stoichiometry?
A
the mass of carbon produced when a known mass of sucrose decomposes
B
the amount of energy required to break the ionic bonds in calcium fluoride
C
the number of moles of hydrogen that react completely with a known quantity of oxygen
D
the mole ratio of aluminum and chlorine in aluminum chloride
7) A balanced chemical equation allows one to determine the
A
energy released in the reaction.
B
electron configuration of all elements in the reaction.
C
mechanism involved in the reaction.
D
mole ratio of any two substances in the reaction.
8) The coefficients in a chemical equation represent the
A
number of valence electrons involved in the reaction.
B
relative numbers of moles of reactants and products.
C
number of atoms in each compound in a reaction.
D
masses, in grams, of all reactants and products.
9) Each of the four types of reaction stoichiometry problems requires using a
A
Lewis structure.
B
mole ratio.
C
chart of electron configurations.
D
table of bond energies.
10) If one knows the mole ratio of a reactant and product in a chemical reaction, one can
A
calculate the mass of the product produced from a known mass of reactant.
B
estimate the energy released in the reaction.
C
decide whether the reaction is reversible.
D
calculate the speed of the reaction.
11) If one knows the mass and molar mass of reactant A and the molar mass of product D in a chemical reaction, one can determine the mass of product D produced by using the
A
mole ratio of D to A from the chemical equation.
B
electron configurations of the atoms in A and D.
C
estimating bond energies involved in the reaction.
D
group numbers of the elements of A and D in the periodic table.
12) In the chemical reaction wA + xB yC + zD, a comparison of the number of moles of A to the number of moles of C would be a(n)
A
energy proportion.
B
mole ratio.
C
electron ratio.
D
mass ratio.
13) In the chemical equation wA + xB yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine
A
the mass of any of the reactants or products.
B
the mass of B only.
C
the total mass of A and B only.
D
the total mass of C and D only.
14) In the reaction N2 + 3H2 2NH3, what is the mole ratio of nitrogen to ammonia?
A
1:1
B
1:2
C
1:3
D
2:3
15) In the reaction 2Al2O3 4Al + 3O2, what is the mole ratio of aluminum to oxygen?
A
2:3
B
4:3
C
10:6
D
3:4
16) In the reaction 2H2 + O2 2H2O, what is the mole ratio of oxygen to water?
A
8:1
B
1:4
C
1:2
D
2:1
17) In the reaction Ca + Cl2 CaCl2, what is the mole ratio of chlorine to calcium chloride?
A
1:1
B
2:1
C
2:3
D
1:2
18) In the reaction Zn + H2SO4 ZnSO4 + H2, what is the mole ratio of zinc to sulfuric acid?
A
1:1
B
1:2
C
3:1
D
1:6
19) In the reaction C + 2H2 CH4, what is the mole ratio of hydrogen to methane?
A
2:4
B
1:2
C
2:1
D
1:1
20) In the reaction N2 + 3H2 2NH3, what is the mole ratio of hydrogen to ammonia?
A
1:1
B
3:2
C
6:8
D
2:1
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