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2018 2nd Semester Chemistry Final Questions Flashcards | StudBud
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2018 2nd Semester Chemistry Final Questions
2018 2nd Semester Chemistry Final Questions
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#chemistry #final
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1
Particles within a solid
move about freely
exchange positions easily
do not move
vibrate about fixed positions
2
reference picture
it does not change
it varies unpredictably
it generally increases
it generally decreases
3
if two covalently bonded atoms are identical, the bond is...
nonpolar covalent
dipole covalent
coordinate covalent
polar covalent
4
in most chemical reactions the amount of product obtained is...
more than the percentage yield
more than the theoretical yield
equal to the theoretical yield
less than the theoretical yield
5
name the compound SO
3
sulfur trioxide
selenium trioxide
silver trioxide
sodium trioxide
6
in the reaction 2Al
2
O
3
----> 4Al+3O
2
, what is the mole ratio of aluminum to oxygen?
10:6
2:3
4:3
3:4
7
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the reaction absorbs energy
CO2 is a gas and carbon is a crystal
CO2 has chemical properties that differ from those C and O
the reaction releases energy
8
according to the law of conservation of mass, the total mass of the reacting substances is...
always more than the total mass of the products
sometimes more and sometimes less than the total mass
always less than the total mass of the products
always equal to the total mass of the products
9
in metals, the valence electrons...
are attached to particular positive ions
are immobile
form covalent bonds
are shared by all of the atoms
10
in what kind of reaction does one element replace a similar element in a compound?
displacement reaction
combustion
decomposition reaction
ionic reaction
11
the empirical formula may not represent the actual composition of a unit of a(n)...
salt
ionic compound
crystal
molecular compound
12
what is the formula for the compound formed by calcium ions and chloride ions?
Ca2Cl
CaCl3
CaCl
CaCl2
13
The reactions represented by the equation 2Mg(s) + O
2
(g) ---> 2MgO(s) is a
decomposition reaction
synthesis reaction
double-displacement reaction
combustion reaction
14
reference picture
composition stoichiometry
chemical kinetics
chemical equilibrium
reaction stoichiometry
15
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qualitative analysis
chemical kinetics
entropy
stoichiometry
16
which of the following is a formula equation for the formation of carbon dioxide from C and O?
C + O2 ---> CO2
CO2----> C + O2
2C + O ----> CO2
carbon plus oxygen yields carbon dioxide
17
a formula that shows the simplest whole-number ratio of the atoms in a compound is the...
molecular formula
empirical formula
ideal formula
experimental formula
18
the equation A+X —> AX is the general for a(n)...
combustion reaction
synthesis reaction
ionic reaction
double-displacement reaction
19
the coefficients in a chemical equation represent the...
relative numbers of moles of reactants and products
masses, in grams, of all reactants and products
number of atoms in each compound in a reaction
number of valence electrons involved in the reaction
20
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mole ratio of D to A from the chemical equation
electron configurations of the atoms in A and D
group # of the elements of A and D in the periodic table
estimated bond energies involved in the reaction
21
name the compound KClO
3
potassium chloride
potassium trioxychlorite
hypochlorite
potassium chlorate
22
The periodic law allows some properties of an element to be predicted base on its
number of isotopes
color
position in the periodic table
symbol
23
a balanced chemical equation allows one to determine the...
electron configuration of all elements in the reaction
the energy released in the reaction
mechanism involved in the reaction
mole ratio of any two substances in the reaction
24
in an acid-base titration, the primary standard...
is always a highly pure acid
is always a highly pure base
is either a highly pure acid or a highly pure base
is neither an acid or a base
25
The atomic number of lithium (Group 1) is 3. What is the # of the second element in this group
18
11
10
4
26
Titanium, atomic # 22, has the configuration [Ar] 3d
2
s
2
. To what group does titanium belong?
Group 2
Group 5
Group 4
Group 3
27
in a chemical reaction...
the mass of the reactants equals the mass of the products
energy as heat must be added to the reactants
the number of atoms in the reactants and products change
the mass of the products is > the mass of the reactants
28
The ability of an element to react is the element's
valence
electronegativity
stability
activity
29
in drawing a lewis structure, the central atom is generally the...
atom with the fewest electrons
atom with the greatest mass
atom with the highest atomic number
least electronegative atom
30
forces holding particles together are strongest in a...
solid
gas
liquid
vapor
31
the discovery of what elements added a new column to mendeleev's periodic table?
transition elements
noble gases
metalloids
radioactive elements
32
name the compound CF
4
calcium fluoride
monocalcium quadrafluoride
carbon fluoride
carbon tetrafluoride
33
when a solid produced by a chemical reaction sparates from the solution it is called...
a molecule
a precipitate
a reactant
the mass of the product
34
what is the study of the mass relationships of elements in compounds?
reaction stoichiometry
percentage yield
avogadro's principle
composition stoichiometry
35
refefence picture
the hybridization model
VESPR theory
the electron-sea model
Lewis Theory
36
bc the 1st energy level contains only the 1s sublevel, the number of elements in this period is
8
4
1
2
37
Nuertrial atoms with s
2
p
6
electron configuration in highest energy level go to which block.
p block
f block
p block
s block
38
reference picture
1 mol A / molar mass A
molar mass A / 1 mol A
2 mol C / 3 mol A
3 mol A / 2 mol C
39
some metals, such as iron, react with steam to prouce hydrogen gas and a...
metal hydride
metallic acid
metal hydroxide
metal oxide
40
formula includes the symbols of the elements in the compound and subscripts that indicate...
charges on the elements or ions
# of atoms or kind element that are combined in the compound
atomic mass of each element
formula mass
41
In an equation, the symbol for a substance in water solution is followed by
(g)
(s)
(aq)
(l)
42
the equation AX + BY ----> AY + BX is the general equation for a...
single-displacement reaction
decomposition reaction
synthesis reaction
double-displacement reaction
43
which word equation represents the reaction that produces water from hydrogen and oxygen?
water is produced from hydrogen and oxygen
water can be seperated into hydrogen and oxygen
H2 + O2 ---> water
hydrogen plus oxygen yields water
44
when atoms share electrons, the electrical attraction of an atom for the shared electrons is...
the atom’s electron affinity
the atom’s resonance
the atom’s electronegativity
the atom’s hybridization
45
a chemical equation is balanced when the...
b
c
a
d
46
reference picture
dipole-dipole interaction
hybridization
malleability
VSEPR theory
47
the empirical formula is always the accepted formula for a/an...
molecular compound
ionic compound
atom
molecule
48
reference picture
mendeleev
ramsay
bohr
moseley
49
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atomic numbers
colors
densities
properties
50
ions are formed from solute molecules by the action of the solvent in a process called...
dissociation
precipitation
ionization
oxidation
51
reference picture
n-s
2n
np1
ns1
52
the reaction represented by the equation Pb(NO
3
)
2
(aq)+2KI(aq)-->PbI
2
(s)=2KNO
3
(aq) is a...
synthesis reaction
combustion reaction
decomposition reaction
double-displacement reaction
53
what is the formula for dinitrogen trioxide?
Ni2O3
N2O6
N2O3
NO3
54
which groups in the main group have lower electronegativity than d-block elements?
groups 17 and 18
groups 1 and 2
groups 13 through 17
groups 13 through 18
55
reference picture
10
3
17
7
56
strontium’s highest occupied energy level is 5
s
2
to what group does strontium belong?
group 8
group 6
group 5
group 2
57
the formula for carbon dioxide, CO
2
, can represent...
1 mol of carbon dioxide molecules
all of the above
the combination of 1 atom of carbon and 2 atoms of oxygen
one molecule of carbon dioxide
58
name the compound Zn
3
(PO
4
)
2
trizinc polyoxide
zinc phosphate
zinc potassium oxide
zinc phosphite
59
the reaction represented by 2HgO(s) ---> 2Hg(l)+O
2
(g) is a/an...
decomposition reaction
single-displacement reaction
combustion reaction
synthesis reaction
60
in groups 13-18, valance electrons may be in sub levels...
d and f
s and p
s and d
p and d
61
what is the formula for the compound formed by lead(II) ions and chromate ions?
Pb(CrO4)2
Pb2(CrO4)3
Pb2CrO4
PbCrO4
62
the chemical formula for an ionic compound represents the...
number of atoms in each molecule
ratio of the combined ions present in a sample
total number of ions in the crystal lattice
number of ions in each molecule
63
a chemical equation is balanced when the...
c
a
d
b
64
when the formula Fe
3
O
4
+Al ---> Al
2
O
3
+ Fe is correctly balanced the coefficient of Fe is #...
7
2
3
9
65
to balance a chemical equation, it may be necessary to adjust the...
formulas of the products
subscripts
number of products
coefficients
66
the reaction represented by the equation Mg(s)+2HCl(aq)---> H
2
(g)+MgCl
2
(aq) is a...
composition reaction
decomposition reaction
single-displacement reaction
double-displacement reaction
67
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energy proportion
electron ratio
mole ratio
mass ratio
68
after the first steps in writing an equation, the equation is balanced by...
adjusting coefficients to the smallest whole-number ratio
making the # of reactants equal to the number of products
changing the products formed
adjusting subscripts to the formula
69
Name the compound SiO
2
silver oxide
silicon dioxide
monosilver dioxide
silicon oxide
70
for each successive electron removed from an atom, the ionization energy...
shows no pattern
remains the same
increases
decreases
71
reference picture
krypton
argon
helium
neon
72
in what kind of reaction does a single compound produce two or more simpler substances?
decomposition reaction
synthesis reaction
ionic reaction
single-displacement reaction
73
name the compound Fe(NO
3
)
2
iron (III) nitride
iron (II) nitrite
iron (III) nitrate
iron (II) nitrate
74
in what kind of reaction do two or more substances combine to form a new compound?
synthesis reaction
double-displacement reaction
combustion reaction
decomposition reaction
75
the units of molar mass are...
g/mol
mol/g
amu/mol
amu/g
76
which observation does not indicate that a chemical reaction has occurred?
evolution of heat and light
production of a gas
formation of a precipitate
change in the total mass of the substances
77
the ions in most ionic compounds are organized into a...
lewis structure
crystal
molecule
polyatomic ion
78
in the chemical equation 2Mg(s)+O
2
(g)?MgO(s)...
O2 represents the product oxygen gas
Mg represents the product magnesium
Mg represents the reagent magnesium
the reaction yields magnesium
79
pressure has the greatest effect on the solubility of....
liquids in liquids
gases in liquids
solids in liquids
gases in gases
80
to draw a lewis structure, one must know....
bond length of each atom
ionization energy of each atom
atomic mass of each atom
the number of valence electrons in each atom
81
In Group 2 elements, the valence electrons are in sublevel
s
p
f
d
82
what is the study of the mass relationships among reactants and products in a chemical reaction
periodic law
reaction stoichiometry
electron configuration
composition stoichiometry
83
reference picture
double-displacement reaction
combustion reaction
synthesis reaction
decomposition reaction
84
which of the following would be investigated in reaction stoichiometry?
the amount of energy released in chemical reactions
the mass of K required to produce a known mass of Kchloride
types of bonds that break and form when acids react w metals
the masses of hydrogen and oxygen in water
85
in a solution at equilibrium,
the rates of dissolution and crystallization are equal
the rate of dissolution is > the rate of crystallization
no dissolution occurs
the rate of dissolution is < the rate of crystallization
86
which of the following expresses concentration?
all of the above
moles of solute per liter of solution
molarity
molality
87
the density of a substance undergoes the greatest change when the substance changes from a...
liquid to a gas
solid to a liquid
a molecular solid to an ionic solid
liquid to a solid
88
Active metals react with certain acids, such as hydrochloric acid to yield a metal compound and
hydrogen
oxygen
sodium
chlorine
89
which indicator is used to study neutralizations of strong acids with strong bases?
bromthymol blue
none of the above
methyl orange
phenolphthalein
90
reference picture
density
elasticity
kinetic energy
quantity
91
reference picture
Ca+
Ca4+
Ca2+
Ca3+
92
an insoluble gas that forms in a double-displacement reaction in aqueous solution...
forms a precipitate
bubbles out of solution
reacts with the water
disassociates into ions
93
in what kind of reaction do 2 or more substances combine to form a new compound?
decomposition reaction
double-displacement reaction
ionic reaction
synthesis reaction
94
to balance a chemical equation, it may be necessary to adjust the...
formulas of the products
subscripts
number of products
coefficients
95
what is the maximum possible amount of product obtained in a chemical reaction?
mole ratio
theoretical yield
percentage yield
actual yield
96
The lattice energy is a measure of the
strength of a covalent bond
net charge on a crystal
strength of a metallic bond
strength of an ionic bond
97
If one knows the mole ratio of a reactant and product in a chemical reaction, one can:
estimate the energy released in the reaction
calculate the mass of the product from the mass of reactant
decide whether the reaction is reversible
calculate the speed of the reaction
98
what is the small whole number that appears in front of a formula in a chemical equation?
a coefficient
a subscript
a superscript
a ratio
99
according to the kinetic-molecular theory, particles of matter...
have different colors
have different shapes
are in constant motion
are always fluid
100
when potassium reacts with water, one product formed is...
salt
potassium oxide
hydrogen gas
oxygen gas
101
which equation is
not
balanced?
H2 + H2 + O2 ---> H2O + H2O
4H2 + 2O2 ---> 4H2O
2H2 + O2 ---> 2H2O
2H2+O2+H2O
102
reference picture
the total mass of C and D only
the total mass of A and B only
the mass of B only
the mass of any of the reactants or products
103
A chemical formula for a molecular compound represents the composition of
the crystal lattice
the ions that make up the compound
an atom
a molecule
104
the equation A + BX ----> AX + B is the general equation for a...
single-displacement reaction
decomposition reaction
combustion reaction
double-displacement reaction
105
the molar mass of an element is the mass of one...
mole of the element
gram of the element
atom of the element
crystal of the element
106
an acid-base titration determines the volumes of two solutions that...
are chemically equivalent
have equal molarity
have equal molality
have equal mass
107
a chemical formula written over the arrow in a chemical equation signifies...
the formation of a gas
an impurity
a catalyst for the reaction
a by-product
108
a neutral group of atoms held together by covalent bonds is a...
chemical formula
molecular formula
molecule
polyatomic ion
109
in writing a chemical equation that produces hydrogen gas, the correct representation is...
H2
H
OH
2H
110
an active metal and a halogen react to form a(n)...
salt
hydroxide
acid
oxide
111
the reaction represented by 2KClO
3
(s) ---> 2KCl(s) + 3O
2
(g) is a/an....
decomposition reaction
synthesis reaction
combustion reaction
ionic reaction
112
in nature, the alkali metals occur as...
compounds
complex ions
elements
gases
113
a empirical formula of a compound shows the symbols of the elements with subscripts indicating
atomic masses of each element
actual numbers of atoms in a molecule
number of moles of the compound in 100 g
the smallest whole-number ratio of the atoms
114
reference picture
is supersaturated
is heterogeneous
is saturated
contains an electrolyte
115
what is the sum of the atomic mass of all the atoms in a formula for a compound?
formula mass
actual mass
atomic mass
molecular mass
116
reference picture
O3
oxygen
O2
O
117
In the reaction represented by the equation N
2
+3H
2
---> 2NH
3
, what is the mole ratio of N-2NH
3
1:2
1:3
1:1
2:3
118
what is the formula for barium hydroxide?
Ba(OH)2
Ba(OH)
BaOH2
BaOH
119
the compressibility of a liquid is generally...
more than that of a gas
less than that of a gas
zero
equal to that of a gas
120
when a binary compound decomposes, what is produced?
a tertiary compound
two elements
an acid
an oxide
121
groups 13-18, the total number of electrons in the highest occupied level equals the group #
minus 10
plus 1
minus 1
plus 5
122
an acid-base titration involves a...
decomposition reaction
composition reaction
single-displacement reaction
neutralization reaction
123
what is the formula for silicon dioxide?
SO2
S2O
SiO2
Si2O
124
which of the following is not correct about crystalline solids?
they can exist as single crystals
they can maintain a definite shape without a container
their partners are held in relatively fixed positions
they are geometrically irregular
125
Metals are malleable because the metallic bonding
holds the layers of ions in rigid positions
maximizes the repulsive forces within the metal
allows one plane of ions to slide past another
is easily broken
