Stoichiometry Unit 9- 2 Question Preview (ID: 17547)


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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) entropy
c) chemical kinetics
d) stoichiometry

What is the study of the mass relationships of elements in compounds?
a) reaction stoichiometry
b) composition stoichiometry
c) percent yield
d) Avogadro's principle

What is the study of the mass relationships among reactants and products in a chemical reaction?
a) reaction stoichiometry
b) composition stoichiometry
c) electron configuration
d) periodic law

Which of the following would be investigated in reaction stoichiometry?
a) the masses of hydrogen and oxygen in water
b) the amount of energy released in chemical reactions
c) the mass of potassium required to produce a known mass of potassium chloride
d) the types of bonds that break and form when acids react with metals

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 kinetics
c) chemical equilibrium.
d) composition stoichiometry

Which of the following would NOT be studied in the branch of chemistry called stoichiometry?
a) the mole ratio of aluminum and chlorine in aluminum chloride
b) the amount of energy required to break the ionic bonds in calcium fluoride
c) the mass of carbon produced when a known mass of sucrose decomposes
d) the number of moles of hydrogen that react completely with a known quantity of oxygen

A balanced chemical equation allows one to determine the
a) mole ratio of any two substances in the reaction.
b) energy released in the reaction.
c) electron configuration of all elements in the reaction.
d) mechanism involved in the reaction.

The coefficients in a chemical equation represent the
a) masses, in grams, of all reactants and products.
b) relative numbers of moles of reactants and products.
c) number of atoms in each compound in a reaction.
d) number of valence electrons involved in the reaction.

Each of the four types of reaction stoichiometry problems requires using a
a) table of bond energies.
b) chart of electron configurations.
c) Lewis structure.
d) mole ratio.

If one knows the mole ratio of a reactant and product in a chemical reaction, one can
a) estimate the energy released in the reaction.
b) calculate the speed of the reaction.
c) calculate the mass of the product produced from a known mass of reactant.
d) decide whether the reaction is reversible.

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) group numbers of the elements of A and D in the periodic table.
c) estimating bond energies involved in the reaction.
d) electron configurations of the atoms in A and D.

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) mass ratio.
b) mole ratio.
c) electron ratio.
d) energy proportion.

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 C and D only.
d) the total mass of A and B only.

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

In the reaction 2Al2O3  4Al + 3O2, what is the mole ratio of aluminum to oxygen?
a) 10:6
b) 3:4
c) 2:3
d) 4:3

In the reaction 2H2 + O2  2H2O, what is the mole ratio of oxygen to water?
a) 1:2
b) 2:1
c) 8:1
d) 1:4

In the reaction Ca + Cl2  CaCl2, what is the mole ratio of chlorine to calcium chloride?
a) 2:3
b) 2:1
c) 1:2
d) 1:1

In the reaction Zn + H2SO4  ZnSO4 + H2, what is the mole ratio of zinc to sulfuric acid?
a) 1:6
b) 1:1
c) 1:2
d) 3:1

In the reaction C + 2H2  CH4, what is the mole ratio of hydrogen to methane?
a) 1:1
b) 2:1
c) 1:2
d) 2:4

In the reaction N2 + 3H2  2NH3, what is the mole ratio of hydrogen to ammonia?
a) 1:1
b) 2:1
c) 3:2
d) 6:8

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