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WorksheetsAP Chemistry College Board Review
Total questions: 89
Worksheet time: 45mins
The Maxwell-Boltzmann distribution of molecular speeds in samples of two different gases at the same temperature is shown below. Which gas has the greater molar mass?
Gas A
Gas B
both gasses have the same molar mass
it cannot be determined unless the pressure of each sample is known
Which of the following is most likely to be a solid at room temperature?
Na2S
HF
NH3
N2
According to the balanced equation above, how many moles of CIO3 (aq) are needed to react completely with 20. ml of 2.0 mL of 2.0M KMnO4 solution?
0.0030 mol
0.0075 mol
0.013 mol
0.030 mol
2H2O2 (I) ---> 2H2O (I) + O2
the exothermic process represented above is best classified as a
physical change because a new phrase appears in the products
physical change because O2 that was dissolved comes out of the solution
chemical change because entropy increases as the process proceeds
chemical change because covalent bonds are broken and new covalent bonds are formed
A 0.10M aqueous solution of sodium sulfate, Na2SO4 is a better conductor of electricity then 0.10M aqueous solution of sodium chloride. Which of the following best explains this difference?
Na2SO4 is more soluble than NaCl is
Na2SO4 has a higher molar mass than NaCl has
to prepare
More moles of ions are present in a given volume of 0.10M Na2SO4 in the same volume of 0.10M NaCl
A 0.20 mol sample of MgCl(s) and a 0.10 mol sample of KCl (s) are dissolved in water and diluted to 500 ml. What is the concentration of CL- in the solution?
0.15 M
0.30 M
0.50 M
1.0 M
a 0.5 mol sample of he(g) and a 0.5 mol sample of Ne(g).....Which of the gases will escape faster through the pinhole and why?
He(g) will escape faster because the He(g) atoms are moving at a higher average speed than the Ne(g) atoms
Ne(g)
Ne(g)
both gases
a 1.0 L sample of a pure gas is found to have a lower pressure than predicted.....the best explaination for this observation is that the molecules of the gas.....
have a combined volume that is too large
have a lower molecular mass....
are attracted to each other and do no exert as much force on the container walls as they would if they had no mutual attractions
are attracted to the sides of the container....
CH3OH ---> CO + 2H2
what is the final pressure in the vessel after the reaction is complete and the contents of the vessel are returned to 600k?
Pi/9
Pi/3
Pi
3Pi
The total pressure of the gas mixture is 5.00 atm/ The partial pressure of argon is
0.200 atm
0.500 atm
1.00 atm
2.00 atm
an oxidation-reduction reaction that is also a synthesis reaction
2Mg(s) + O2(g) --->2MgO(s)
Pb 2-
SO3
2H2
At 298K and 1 atm, Br is a liquid with a higher vapor pressure and Cl is a gas. Those observations provide evidence that under the given conditions...
forces among the Br2 molecules are stronger than those among the Cl2 molecules
forces among Cl2 molecules are stronger than the Cl-Cl bond
Br-Br bond is stronger
Cl-Cl bond is stronger
At constant temperature, the behavior of a sample of a real gas more closely approximate that of an ideal gas as the volume of the container is increased because the
collisions
molecules
average distance between molecules becomes greater
average molecular kinetic energy decreases
Atoms of which element are reduced in the reaction above?
S; each atom loses 4 electrons
Na in Na2O2 each atoms loes one electron
O in Na2O2 each atom gain one electron
O
Based on the half-reactions, what is the coeffeicient for Al(s) is the equation for the oxidation-reduction reaction is balanced with the smallest whole-number coefficients?
1
2
3
4
Based on the concepts of polarity and hydrogen bonding, which of the following sequence correctly list the compounds above in the order of their increasing solubility in water?
Z<Y<X
Y<Z<X
X<Z<Y
X<Y<Z
Equal masses of He and Ne are placed in a sealed container. What is the partial pressure of Ne if the total pressure in the container is 6 atm?
1 atm
3 atm
5 atm
7 atm
in the reaction represented above, what is the total number of moles of reactants consumed when 1.00 moles of CO2 is produced?
0.33 mol
1.33 mol
2.00 mol
6.00 mol
Benzene, C6H6 has the structure shown above. Considering the observation that benzene is only sparingly soluble in water, which of the following best describes the intermolecular forces of attraction between water and benzene?
benzene is nonploar
the H atoms in benzene
benzene is hydrophobic
There are dipole- induced dipole and London dispersion interactions between water and benzene.
A 2 mol sample of F2 reacts with excess NaOH according to the equation above. Which of the following is correct?
the amount of OF produced is doubled
the amount of OF produced is halved
the amount of NaF produced remains the same
the amount of NaF produced is doubled
the reaction above is observed to proceed spontaneously to the right in queous solution. In this system the strongest base is
SO4 2-
CO3 2-
HCO3
HSO4
the diagram above shows a thin-layer chromatogram of a mixture of products from chemical reaction...which of the following would be the best way to decrease the distance that the products travel up the plate?
use pentane instead of hexane
decrease the percentage of ethyl acetate in the solvant
increase the percentage
add up to 5%
equal masses of three ideal gasses X, Y, X are mixed in a sealed rigid container. If the temperature remains constant, which of the following statements about the partial pressure of gas X is correct?
It is equal
It depends on the intermolecular forces of attraction between...
It depends on the relative molecular mass of X,Y, and Z
It can be calculated
compared to the equilibrium vapor pressure of CH3OH at 300K, the equilibrium vapor pressure if CH5OH(I) at 300k is
the same..
higher...
lower, because London dispersion forces among CH5OH molecules are greater then those among CH3OH molecules
lower....
In the reaction represented above, what mass of HF is produced by the reaction of 3.0x10^23 molecules of H with excess F2?
1.0 g
10 g
20 g
40 g
all the reactions represented above occur in aqueous solution of oxalic acid. Which of the following represent a Bronsted-Lowery conjugate acid-base pair?
H2C2O4 and CO4
HC2O4 and C2O4
HCO4 and H2O
H3O and OH
Which of the following would be evidence of a chemical reaction?
the resulting solution is colorless
the temperature of the reaction mixture increases
the total volume of the mixture....
the resulting solution conducts electricity
if equal masses of the following compounds undergo complete combustion (oxygen is excess), which will yield the greatest mass of CO?
Benzene, C6H6
Cyclohexane, C6H12
Glucose, C6H12O6
Methane, Ch=H4
How many moles of Na ions are in 100 ml of 0.200 M Na3PO4?
0.200 mol
0.600 mol
0.0300 mol
0.0600 mol
If the pressure of each gas is increased at constant temperature and condensation occurs, which gas will condense at the lowest pressure?
Methane
Ethane
Butane
all the gases will condense at the same pressure
The average kinetic energy of the gas molecule is
greatest in container A
greatest in container B
greatest in container C
the same in all three containers
Equal volume if 0.2 M lead (II) nitrate and potassium bromide are combined to form lead (II) bromide as a yellow precipitate. Which of the following is the correct net ionic equation for the reaction
Pb + 2Br ---> PbBr2
K
Pb
Pb(NO3)
In a paper chromatography experiment, a sample of pigment is separated into two compounds, X and Y, as shown in the figure above. The surface of the paper is moderately polar. What can be concluded above X and Y based on the experimental results?
X has a larger molar mass than Y does
Y has a larger molar mass than X does
X is more polar than Y
Y is more polar than X
The student made the standard curve to the left. Which of the following most likely caused the error in the point the student plotted at 0.050M Co (aq)?
There was distilled water in the cuvette when the student put the standard solution in it
few drops
longer path length
did not run blank between experiments
In the diagram above, which of the labeled arrow identifies hydrogen bonding in water?
A
B
C
D
Which of the following correctly compares the two samples in terms of their deviation from ideal gas behavior and explain why?
the gas in sample 1
the gas in sample 2 would deviate from ideal gas behavior because the Xe atoms are closer together, lead to an increase in intermolecular attractions
The gas in sample 2
the gases in both sample 1 and 2
Which of the following laboratory set ups is most appropriate for the student to use in order to separate and collect a substantial sample of each of the two hydrocarbons?
Which of the following diagrams shows the correct representation of the hydrogen bonding between thymine and adenine base pairs?
Over what volume range should the student collect the distillate of the compound with the weakest intermolecular forces?
A
B
C
D
Which diagram provides the better particle representation for the solubility of O2 in H2O and why?
Diagram 1
Diagram 1
Diagram 2 because the nonpolar O2 molecules
Diagram 2 because the polar H2O molecules can induce temporary dipoles on the electron clouds of O2 molecules
The reaction is correctly classified as which of the following ppes?
Acid-base
Precipitation
Decomposition
Oxidation-reduction
How many grams of CaCl2 are needed to prepare 100 ml of 0.100 M Cl (aq) ions?
0.555g
1.11g
2.22g
5.55g
The Ideal gas law best describes the properties of which of the following gases at 0 C and 1 atm?
PH3
HBr
SO2
N2
What is the partial pressure of Z(g) when the partial pressure of W(g) has decreased to 1.0 atm?
0.20 atm
0.40 atm
1.0 atm
1.2 atm
Which of the following correctly indicates the type of transition observed for the substance in each of the regions of the absorption spectrum?
Molecular vibration
electron transition
molecular rotation
electron transition, molecular vibration, molecular rotation
Which of the following combination will produce a solid closest to the center of the tube?
HCl and CH3NH2
HCl and Nh3
HBr and CH3NH2
HBr and NH3
After all the gases are combined in a previously evacuated 2.0 L vessel what is the total pressure of the gases at 298k?
3.0 atm
4.5 atm
9.0 atm
18 atm
Which of the following is a list of compounds in order of increasing boiling points?
butane<1-propanal<acetone
butane < acetone < 1-propanol
..
...
Based on the diagram above, which of the following best helps explain why MgO(s) is not able to conduct electricity, but MgO(I) is a good conductor of electr
MgO(s) does not contain free electrons
MgO(s) contains no water
MgO(s) consists of seperate Mg
MgO(s) consists of seperate Mg ions and O ions held in a fixed lattice
then the solution represented in vessel 2 could be an aqueous solution of
KCL
KCL
CaCl with the same molarity
CaCl with twice the molarity of the solution in vessel 1
Based on the table above, which of the following statements provides the best prediction for the boiling point of NaCl?
NaCl will have a lower boiling point
NaCl will have a boiling point between that of....
NaCl
NaCl
Which of the following statements describes the changes in the forces of attraction that occur as H20 changes phase from a liquid to a vapor?
H-O bonds
Hydrogen bonds between
Covalent bonds
Ionic bonds
Which of the following is the most likely explanation for the variance of the data point for the 0.600M CuSO4 solution?
water droplets inside
filled slightly more than the other cuvettes
the wavelength
solution had not been wiped clean
under which of the following conditions of temperature and pressure will H gas expected to behave most like an ideal gas?
50 K and 0.10atm
50 K and 5.0 atm
500 k and 0.10 atm
500 k and 50 atm
the reaction is correctly classified as which of the following types?
Acid-base (H ions are produced)
Precipitation (bc only two reactants)
Double Replacement
Oxidation-reduction
Which of the following could be the identity of a white crystalline solid that exhibits the following properties?
C5H12O6
NaOH
SIO2
Cu
The compound most likely formed with magnesium, Mg is
MgX
Mg2X
MgX2
MgX3
Mg3X2
A 23.0g sample of a compound contains 12.0 g and C, 3.0 g of H and 8 g. Which of the following empirical formula of the compound?
CH3O
C2H6O
,
.
Which of the following questions about the compound is most likely to be answered by the results of the analysis?
What is the density of the pure compound
What is the formula unit of each compound?
What is the chemical reactivity of each compound?
Which of the two compounds is more soluble in water?
Atoms of which of the following elements combine with atoms of F in the same ratio?
Li
Ba
Al
Cl
Ne
Which of the following scientific claims about the bond in the molecular compound in HF is most likely to be true?
There is partial negative change on the H atom
Electrons are shared equally between the H and F atoms
the bond is extremely weak
the bond is highly polar
Which of the following is the most valid scientific claim that can be made about the compound?
It has the formula XZ2
It does not dissolve in water
It contains ionic bonds
It contains covalent bonds
Which of the following claims about the compound that forms from C and Se is most likely to be true?
the carbon-to-seleium bond is unstable
the carbon-to-selenium bond is nonpolar covalent
the compound
a molecule
Which of the following correctly indicates whether the solid represented by the particle model shown to the left conducts electricity and explains why or why not?
It conducts
It conducts
It does not conduct electricity because its ions cannot move freely within the solid
It does not
Assume that the atoms are in the ground-state. The atom that contains exactly two unpaired electrons
S
Ca
Sb
Br
Which of the following best help explain the electronegativity of Cl is less than that of F?
The mass of the Cl
The Cl nucleus
When Cl and F form bonds
Because Cl
Which of the following ground-state electron configurations represents the atom that has the lowest first-ionization energy?
1s2s
1s2s2p
1s2s2p3s
Forms monoatomic ions with 2 charge in solutions
F
S
Mg
Ar
Which of the following has a bond order of 2?
Li
B
N2
O2
How many carbon atoms are contain 28 g of C2H4
1.2
3.0
6.0
1.2X10^23
How many protons, neutrons and electrons are in an ___ atom?
26, 30, 26
26, 56, 26
56, 26, 26
Which of the following represents a general electron configuration that corresponds to the valence electrons of an element for which there is an especially large jump between the third and fourth ionization energies?
ns^2
ns^2np^1
..
..
Which of the following must the student know in order to determine how many molecules are in the sample?
mass of the sample
mass of the sample
molar mass of the compound, mass of the sample
molar mass of the compound, density of the sample
Which of the following statements accounts for the difference in polarity of the two molecules?
In NF
N-F bonds are polar
NF2
Unlike BF has a nonplanar geometry
which of the following best helps explain the large difference between the lattice energies of NaF and MgF2?
the solubility
the electronegativity
the mass
the charge
the molecular geometries and polarity of the two substances are
the same
the same
different because the lone pair
different because S has a greater number of electrons
Which of the following electron configurations is consistent with the spectrum?
..
..
1s22s2
...
Which of the following observations would provide evidence that the spectrum is consistent with the atomic model of the element?
a neutral atom
the element
in its compunds
in its compounds, the elements tend to form ions with a charge of +3
for which of the following pairs of ions is the energy that is required to separate the ions largest?
Na and Cl
Ca and Br
Mg and O
Ca and O
In which reaction represented above, which is the hybridization of the C atoms and before and after the reaction occurs?
sp, sp2
sp, sp3
sp2, sp
sp2. sp3
based on the graph, which of the following correctly identifies the diatomic molecules?
H2, N2, O2
H2, O2, N2
N2, O2, H2
O2, H2, N2
Which of the following correctly identifies the species associated with peak X and provides valid justification?
Ar
Ar
Ca 2+
Ca 2+, because its nucleus has two more protons than the nucleus of Ar has
Which of the following is true regarding the force between the atoms when they internuclear distance is X?
the attractive and repulsive forces are balanced
the is a net repulsive forces pushing the atoms apart
the is net
it cannot be determined
How many moles of HCl (g) have been produced?
24 mol
20 mol
8 mol
4 mol
the electron pair in a C-F bond could be considered
closer to C
Close to F
Closer to C
centerally located
which of the following atoms cannot exceed the ocet rule in a molecule?
N
S
I
Which of the following has an incomplete octet in its lewis structure
SO2
ICI
Co2
NO
Which has the greater bond length
No2
No3
