Transcript Clicker Questions

Clicker Questions
Chapter 3
Molecules,
Compounds, and
Chemical Equations
Allison Soult
University of Kentucky
© 2014 Pearson Education, Inc.
There are two compounds of Ni and O. The green
colored oxide of nickel has a Ni:O mass ratio of 3.67:1
and a Ni:O atom ratio of 1:1. The black colored oxide of
nickel has a Ni:O mass ratio of 2.45:1. Which of the
following is correct?
a) The two compounds have different formulas.
b) The two compounds have nickel ions with different
charges.
c) The Ni:O atom ratio of the black oxide is 2:3.
d) This is an example of the Law of Multiple Proportions.
e) All of the above are correct.
© 2014 Pearson Education, Inc.
Which of the following compounds exhibits both ionic
and covalent bonding?
a)
b)
c)
d)
e)
SO2
CF4
NaCl
Na2SO4
P4O10
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Which of the following would NOT be classified as a
molecular compound?
a)
b)
c)
d)
e)
CO
C2H4
C6H12O6
NH4C2H3O2
NH3
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Which of the following is the correct formula for
aluminum bromide?
a)
b)
c)
d)
AlBr
Al3Br
AlBr3
Al3Br3
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What is the IUPAC name for FeCl3?
a)
b)
c)
d)
iron chloride
iron trichloride
iron(III) chloride
iron chloride(III)
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What is the formula for potassium carbonate?
a)
b)
c)
d)
KCO3
K(CO3)2
K2CO3
KCO6
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A toy used to predict the weather had a picture
containing CoCl2. It worked on the following reversible
reaction:
CoCl2 + 6 H2O  CoCl2 ∙ 6 H2O
Which of the following statements is correct?
a) The picture was red on sunny days and blue on rainy
days.
b) The picture was blue on sunny days and red on
rainy days.
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Which of the following correctly matches the formula
with its name?
a)
b)
c)
d)
e)
P2O5, phosphorus pentoxide
H2O, dihydrogen monoxide
NaNO3, monosodium nitrate
K2O, dipotassium monoxide
Fe2O3, iron(II) oxide
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What is the name of the oxyacid formed from sulfite
(SO32−)?
a)
b)
c)
d)
e)
hydrosulfuric acid
sulfuric acid
hydrosulfurous acid
sulfurous acid
hydrogen sulfide acid
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What is the molar mass of calcium phosphate?
a)
b)
c)
d)
e)
310.18 g/mole
230.02 g/mole
324.99 g/mole
135.05 g/mole
214.18 g/mole
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Which sample represents the greatest number of moles?
a) 44.01 g CO2
b) 1.0 moles C3H8
c) 6.022 x 1023
molecules C4H10
d) 18.02 g H2O
e) All of the samples
have the same
number of moles.
© 2014 Pearson Education, Inc.
Which of the following contains the largest number of
molecules?
a)
b)
c)
d)
10.0 g CH4
10.0 g C2H6
10.0 g SO2
10.0 g Xe
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Which of the following contains the largest mass
percent hydrogen?
a)
b)
c)
d)
10.0 g CH4
10.0 g C2H6
10.0 g H2O
10.0 g H2S
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Calculate the number of carbon atoms in 25.0 grams of
isopropyl alcohol (C3H8O).
a)
b)
c)
d)
e)
1.25 C atoms
15.0 C atoms
2.51 x 1023 C atoms
7.52 x 1023 C atoms
2.07 x 10–24 C atoms
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An unknown compound contains the following
percents by mass: C: 60.86%, H: 5.83%, O: 23.16%, and
N: 10.14%. Find the empirical formula.
a)
b)
c)
d)
e)
C6H8O2N2
C7H8O2N
C6H8O2N
C8H8O2N
C8H8ON
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What is the empirical formula of a compound
containing C, H, and O if combustion of 3.69 g of the
compound yields 5.40 g of CO2 and 2.22 g of H2O?
a)
b)
c)
d)
e)
CH3O
C2H3O
CHO
C2H3O2
CH2O
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What are the coefficients for the decomposition of
nitroglycerin?
__ C3H5N3O9  __ N2 + __ CO2 + __ H2O + __ O2
a) 2,3,6,2,1
b) 2,3,6,5,1
c) 4,6,12,10,12
d) 4,3,12,10,1
e) 4,6,12,10,1
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Which of the following statements is true about a
balanced chemical reaction?
a) The mass of the reactants is equal to the mass of the
products.
b) The number of each type of atom is the same in the
reactants and in the products.
c) The moles of each type of atom is the same in the
reactants and in the products.
d) All of the above.
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Hydrocarbons are composed of just the elements
carbon and hydrogen. Which of the following
compounds has all single bonds?
a)
b)
c)
d)
naphthalene, C10H8
propane, C3H8
ethyne, C2H2
ethene, C2H4
© 2014 Pearson Education, Inc.