Micro 020 - General Microbiology » Winter 2021 » Quiz 7 - Chemical Reactions
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Question #1
In an oxidation-reduction reaction, the substance oxidized always
A.
shows a gain of electrons.
B.
takes on oxygen atoms.
C.
gives up hydrogen atoms.
D.
shows a loss of electrons
Question #2
What is oxidized in the following reaction? 2 Al (s) + 3 Br2 (l) → 2 AlBr3 (s)
A.
nothing is oxidized
B.
AlBr3
C.
Al
D.
Br2
Question #3
What is reduced in the following reaction? 2 Al (s) + 3 Br2 (l) → 2 AlBr3 (s)
A.
Al
B.
Br2
C.
AlBr3
D.
nothing is reduced
Question #4
Which of the following is a chemical change?
A.
melting gold
B.
bending a steel rod
C.
burning sugar
D.
cutting a rope
Question #5
In a ________ reaction, two or more elements or compounds form one product.
A.
double replacement
B.
single replacement
C.
combination
D.
decomposition
Question #6
0.100 mole of lithium weighs
A.
0.694 g.
B.
6.94 g.
C.
0.300 g
D.
3.00 g.
Question #7
Calculate the molar mass of potassium chloride, KCl.
A.
74.6 g
B.
19.0
C.
6.74 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.
1.0 mole.
C.
3.0 moles.
D.
4.0 moles.
Question #9
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
A.
426 g
B.
103 g
C.
180 g
D.
639 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.
30.4 g
B.
101 g
C.
60.8 g
D.
50.4 g
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