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