Chemistry Chapter 9 Semester Study
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
D. composition stoichiometry
To balance a chemical equation, it may be necessary to adjust the: a). coefficients b). subscripts c). formulas of the products d). number of products
a). coefficients
The units of molar mass are: a). g/mol b). mol/g c). amu/mol d). amu/g
a). g/mol
A balanced chemical equation allows one to determine the: a). mole ration 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
a). mole ration of any two substances in the reaction
What is the maximum possible amount of product obtained in a chemical reaction: a). theoretical yield b). percentage yield c). mole ratio d). actual yield
a). theoretical yeild
In the reaction represented by the equation N₂+3H₂→2NH₃, what is the mole ratio of nitrogen to ammonia: a). 1:1 b). 1:2 c). 1:3 d). 2:3
b). 1:2
A chemical equation is balanced when the: a). coefficients of the equal the coefficients of the products b). same number of each kind of atom appears in the reactants in the products c). products and reactants are the same chemicals d). subscripts of the reactants equal the subscripts of the products
b). same number of each kind of atom appears in the reactants in the products
To determine the limiting reactant in a chemical reaction, one must know the: a). available amount of one of the reactants b). amount of product formed c). available amount of each reactant d). speed of the reaction
c). available amount of each reactant
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.
c). calculate the mass of the product produced from a known mass of reactant
A chemis interested in the efficiency of a chemical reaction would calculate the: a). mole ratio b). energy released c). percentage yield d). rate of reaction
c). percentage yield
Which coefficients correctly balance the formula NH₄NO₂→N₂+H₂O: a). 1,2,2 b).1,1,2 c).2,1,1 d)2,2,2
d). 2,2,2
In the reaction represented by the equaton 2Al₂O₃→4Al+3O₂, what is the mole ratio of aluminum to oxygen: a). 10:6 b). 3:4 c). 2:3 d). 4:3
d). 4:3
When the formula equation Fe₃O₄+ Al→Al₂O₃+Fe is correctly balanced the coefficient of Fe is number: a). 3 b). 2 c). 7 d). 9
d). 9
Which reactant conrtols the amount of product formed in a chemical reaction: a). excess reactant b). mole ratio c). composition d). limiting reactant
d). limiting reactant
Each of the four types of reaction stoichimetry problems requires using a: a). table of bond energies b). chart of electron configurations c). Lewis structure d). mole ratio
d). mole ratio
When the limiting reactant in the chemical reaction is completely used, the: a). excess reactants begin combining b). reaction slows down c). reaction speeds up d). reaction stops
d). reaction stops
in what kind of reaction do two or more substances combine to form a new compound: a). decomposition reaction b). combustion reaction c). double-displacement reaction d). synthesis reaction
d). synthesis reaction
