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Chemical Reactions And Stoichiometry
Test Description: Chemical Reactions Stoichiometry Unit Review
Instructions: Answer all questions to get your test result.
1) The production of a solid in a double displacement reaction results in the formation of a
A
gas
B
combustion reaction
C
precipitate
D
halogen
2) To balance a chemical equation, it is permissible to adjust the
A
subscripts
B
coefficients
C
number of products
D
formulas of the products
3) In a chemical equation, the symbol (aq) indicates that the substance is
A
water
B
dissolved in water
C
an acid
D
insoluble
4) The coefficients in a chemical equation
A
indicate the number of moles of each substance that react
B
show the number of grams of each substance that react
C
are the molar masses of the substances
D
show the valence electrons for each atom
5) The general equation for a synthesis reaction is
A
A + B produces AB
B
AB + CD produces AC + CD
C
AB + C produces AC + B
D
AB produces A + B
6) Nitrogen gas reacts with hydrogen gas to produce NH3. What is the mole ratio of hydrogen gas to NH3?
A
1:2
B
3:2
C
1:3
D
2:3
7) In the reaction A +B produces C + D, if there is more reactant B than is required to completely react with all of A, then
A
there is no limiting reactant
B
B is the limiting reactant
C
A is the limiting reactant
D
no product can be formed
8) If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
A
actual yield
B
mole ratio
C
theoretical ield
D
percent yield
9) Fewer steps are required to solve stoichiometry problems when the reactant is given in ___ and the product is desired in ____.
A
grams, liters
B
liters, number of atoms
C
moles, moles
D
grams, grams
10) The substance that is not completely used up in a chemical reaction is known as the
A
excess reactant
B
actual reactant
C
limiting reactant
D
theoretical reactant
*select an answer for all questions
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