Chem 051 - Chemistry for Allied Health Professionals » Winter 2024 » Quiz 7 Chemical Reactions and Stoichiometry

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Question #1
In an oxidation-reduction reaction, the substance oxidized always
A.   shows a gain of electrons.
B.   shows a loss of electrons
C.   gives up hydrogen atoms.
D.   takes on oxygen atoms.
Question #2
What is oxidized in the following reaction? 2 Al (s) + 3 Br2 (l) → 2 AlBr3 (s)
A.   Br2
B.   nothing is oxidized
C.   AlBr3
D.   Al
Question #3
What is reduced in the following reaction? 2 Al (s) + 3 Br2 (l) → 2 AlBr3 (s)
A.   AlBr3
B.   nothing is reduced
C.   Br2
D.   Al
Question #4
Which of the following is a chemical change?
A.   bending a steel rod
B.   burning sugar
C.   cutting a rope
D.   melting gold
Question #5
In a ________ reaction, two or more elements or compounds form one product.
A.   single replacement
B.   decomposition
C.   combination
D.   double replacement
Question #6
0.100 mole of lithium weighs
A.   0.300 g
B.   6.94 g.
C.   3.00 g.
D.   0.694 g.
Question #7
Calculate the molar mass of potassium chloride, KCl.
A.   19.0
B.   6.74 g
C.   74.6 g
D.   54.5 g
Question #8
For the following reaction, how many moles of oxygen gas are required to react with 4.0 moles of Mg? 2 Mg (s) + O2(g) → 2 MgO (s)
A.   2.0 moles
B.   3.0 moles.
C.   1.0 mole.
D.   4.0 moles.
Question #9
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
A.   180 g
B.   639 g
C.   103 g
D.   426 g
Question #10
How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg? 2 Mg (s) + O2 (g) → 2 MgO (s)
A.   60.8 g
B.   101 g
C.   50.4 g
D.   30.4 g

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