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Answers |
Explanation |
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21 Even though the process is
endothermic, snow
can sublime. Which tendency in nature accounts for this
phase change?
(1) a tendency toward greater entropy
(2) a tendency toward greater energy
(3) a tendency toward less entropy
(4) a tendency toward less energy |
1 |
entropy increase as
solids become a gas |
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22 What is the IUPAC name of the
compound with
the structural formula shown below?
(1) 2-pentene
(3) 2-pentyne
(2) 3-pentene
(4) 3-pentyne
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1 |
2-pentene, the
double bond is on the second carbon from the right
-ene is used because there is a
double bond
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23 Molecules of 1-bromopropane and
2-bromopropane
differ in
(1) molecular formula
(2) structural formula
(3) number of carbon atoms per molecule
(4) number of bromine atoms per molecule
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2 |
different structures |
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24 Which
half-reaction correctly represents reduction?
(1) Ag
-->
Ag+
+ e–
(2) F 2
-->
2 F–
+ 2e–
(3) Au3+
+ 3e–-->
Au
(4) Fe2+
+ e–
-->
Fe3+ |
3 |
charge decreases the
electrons go on the more positive side |
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25 In a redox reaction, how does the
total number of
electrons lost by the oxidized substance compare
to the total number of electrons gained by the
reduced substance?
(1) The number lost is always greater
than the
number gained.
(2) The number lost is always equal to
the number
gained.
(3) The number lost is sometimes equal
to the number
gained.
(4) The number lost is sometimes less
than the
number gained. |
2 |
lost always equals
gain |
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26 Which reaction
is an example of an oxidation reduction
reaction?
(1) AgNO 3
+ KI
-->
AgI + KNO3
(2) Cu + 2 AgNO 3
-->
Cu(NO3)2
+ 2 Ag
(3) 2 KOH + H 2SO4
-->
K2SO4
+ 2 H2O
(4) Ba(OH) 2
+ 2 HCl
-->
BaCl2
+ 2 H2O |
2 |
look for the charge
change
***find the reaction involving
a free element
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27 Which compound
is an Arrhenius base?
(1) CH 3OH
(3) LiOH
(2) CO 2
(4) NO2 |
3 |
Bases have OH-
NOT
CH3OH
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28 The only
positive ion found in an aqueous solution
of sulfuric acid is the
(1) hydroxide ion
(3) sulfite ion
(2) hydronium ion
(4) sulfate ion |
2 |
Acid H+
or H3O+ (hydronium) |
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29 Which process uses a volume of
solution of
known concentration to determine the concentration
of another solution?
(1) distillation
(3) transmutation
(2) substitution
(4) titration |
4 |
definition of
titration
Note Acid Base section, look
for this one
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30 Which pH
change represents a hundredfold
increase in the concentration of H3O+?
(1) pH 5 to pH 7
(3) pH 3 to pH 1
(2) pH 13 to pH 14
(4) pH 4 to pH 3
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3 |
count the number of
zeros in 100
more acidic the pH decrease by
2
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