Chemistry Exam 2 Study Guide
If the quantum number ms had possible values +1/2 -1/2, what would be the maximum number of electrons that be placed in a single orbital?
two
Photochemists use electromagnetic radiation to initiate chemical reactions, often by providing the energy required to break bonds within a molecule. Lowering which of the following will result in electromagnetic radiation having more energy per photon?
wavelength
The wave characteristics of a large, moving object, such as an automobile, are difficult to observe because the
wavelength is very small
Acetic acid (CH3CO2H), formic acid (HCO2H), hydrofluoric acid (HF), ammonia (NH3), and methylamine (CH3NH2) are commonly classified as
weak electrolytes
For an electron in a given atom, the larger n, the
larger the average distance from the nucleus and the higher the orbital energy
According to the Balmer-Rhydberg equation, electromagnetic radiation with wavelength y=486.1 nm will be absorbed when an electron undergoes which of the following transitions?
m=2 -> n=4
Arrange the following spectral regions in order of increasing energy: infrared, microwave, ultraviolet, visible.
microwave<infrared<visible<ultraviolet
Using the following portion of the activity series for oxidation half reactions determine which reactions will occur.
K(s) with Sn2+(aq)
Which of the following compounds is not an Arrhenius acid?
KOH
The number of orbitals in a given subshell, such as the 5d subshell, is determined by the number of possible values of
ml.
Molarity is defined as
moles of solute per liter of solution
For the fourth-shell orbital shown below, what are the principal quantum number, n, and the angular momentum quantum number, l?
n=4 and l=1
What are the possible values of n and ml for an electron in a 6d orbital?
n=6 and ml=-2, -1, 0, +1, or +2
Which hydrogen atom transition emits (releases) the largest amount of energy?
n=8->n=6
What is the general valence-electron ground-state electron configuration for neutral halogens?
ns2np7
Which statement about diluted solutions is false? when a solution is diluted
the number of moles of solvent remains unchanged.
In the following reaction, Cl2 is 2 Rb(s) + Cl2(g) -->2 RbCl(s)
the oxidizing agent
According to the Heisenberg uncertainty principle,
the position and momentum of a particle can be measured precisely, but not at the same time.
What is the oxidation number of the chromium atom in K2Cr2O4?
+3
What is the oxidation number of the sulfur atom in SO2?
+4
What is the oxidation number change for the iron atom in the following reaction? 2Fe2O3(s) + 3 C(s) --> 4Fe(s) + 3 CO2 (g)
+7
What are the possible values of l if n=5
0,1,2,3, or 4
How many grams of BaCl2 are formed when 35.00 mL of 0.00237 M Ba(OH)2 reacts with excess Cl2 gas?
0.00864 g
When 50.0 Ml of a 1.00 M solution of Fe(NO3)3 are mixed with 50.0 mL of a 1.00 M solution of NaOH, a precipitate forms. How many miles of precipitate is formed? Fe(NO3)3(aq) + 3 NaOH(aq) --> Fe(OH)3(s) + 3NaNO3(aq)
0.017 moles
A student dissolved 3.00 g of Ca(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the solution then diluted it with water to give 275 mL of a final solution. How many grams of NO3- ion are there in the final solution?
0.0906 g
What is the concentration of FeBr3 in a solution prepared by dissolving 10.0 g of FeBr3 in enough water to make 275 mL of solution?
0.123 M
If the reaction of phosphate ion with water is ignored, what is the total concentration of ions in a solution prepared by dissolving 3.00 of Na3PO4 in enough water to make 350 mL of solution?
0.209 M
What volume of a 0.540 M KOH solution contains 15.5 g of KOH?
0.51 L
A student prepared a stock solution by dissolving 20.0 g of NaOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution. What is the concentration of NaOH for the final solution?
1.82 M
How many h orbitals are allowed in a given shell?
11
How many milliliters of 0.300 M Li2S are needed to react with 25.00 mL of 0.315 M AgNO3? LiS(aq) + 2 AgNO3(aq) --> 2 LiNO3(aq) + Ag2S(s)
13.1 mL
The symbol [Kr] represents
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6
How many H+ ions can the acid H2CO3, donate per molecule?
2
How many electrons can a single orbital hold?
2
What is the first ionization energy for a hydrogen atom in the ground state? The Rydberg constant is 1.097 x 10^-2 nm -1.
2.18 x 10^-18 J
What is the de Brolglie wavelength of an electron (m=9.11x10^31 kg) moving at a velocity of 3.0x10^7 m/s (10% of the speed of light)? (J=kg m2/sec2)
2.4 x 10-11 m
Write a balanced net ionic equation for the reaction of H2SO4(aq) with Ba(OH)2(aq)
2H+(aq) + SO4 2-(aq) + Ba2+ (aq) + 2OH-(aq) --> BaSO4(s) + H2O(l)
Balance the chemical equation given below, and determine the number of milliliters of 0.0600 M phosphoric acid required to neutralize 25.00 mL of 0.0150 M calcium hydroxide.
4.17
What is the frequency of a helium-neon laser light with a wavelength of 623.8 nm? The speed of light is 3.00 x 10^8 m/s
4.74 x 10^14 s-1
How many milliliters of 0.100 M FeCl3 are needed to react with an excess of Na2S to produce 2.75 g of Fe2S3 if the percent yield for the reaction of 65.0%. 3 Na2S(aq) + 2 FeCl3(aq) --> Fe2S3(s) + 6 NaCl(aq)
407 mL
How many orbitals are there in the seventh shell?
49
How many subshells are there in the shell with n=6?
6
Three different substances, A2X, A2Y, and A2Z, were dissolved in water with the following results. Which of the substances is the strongest electrolyte, and which is the weakest?
A2Y is the strongest electrolyte and A2X is the weakest electrolyte.
When Na2CrO4(aq) and AgNO3(aq) are mixed, a red colored precipitate forms which is
Ag2CrO4
What reagent could be used to separate Br- from SO4 2- when added to an aqueous solution
AgNO3(aq)
Atoms of which element, indicated by letter on the periodic table, are expected to have the largest atomic radius?
B
Atoms of which element, indicated by letter on the periodic table, have the orbital-filling diagram shown below? [Ar ^v4s ^^^3d_ _
B
Atoms of which element, indicated by letter on the periodic table, have the orbital-filling diagram shown below? [Ar] ^v4s ^v^v^v 3d^v^v ^^4p^
C
Atoms of which element, indicated by letter on the periodic table, is expected to have the smallest atomic radius?
C
In a solution prepared by mixing CH3OH with H2O the major species present are
CH3OH and H2O
Which of the following compounds is soluble in water?
Ca3(PO4)2
Which has a highest zeff for its valence electrons?
Cl
List all of the elements that have a ground-state configuration with five unpaired electrons in the 3d subshell.
Cr and Mn
When 50.0 mL of a 1.00 M solution of Fe(NO3)3 are mixed with 50.0 mL of a 1.00 M solution of NaOH, a precipitate forms. What is the identity of the precipitate?
Fe(OH)3
In the reaction AgNO3(aq)+HI(aq)-->AgI(s)+HNO3(aq) the spectator ions are
H+ and NO3-
Which one of the following compounds behaves as an acid when dissolved in water?
H2SO3
When dissolved in water, of HClO4, NH3, KOH, HI, and CH3OH which are acids?
HClO4 and HI
Which of the following is not a strong acid?
HF
The chemical formula for nitric acid is
HNO3(aq)
According to the Bohr model, when a hydrogen electron makes a transition from n=4 to n=2, which of the following statements is true?
I and III
Using the following portion of the activity series for oxidation half-reactions, determine which combination of reactions will result in a reaction. Li(s)-->Li+(aq) + e- Cr(s) --> Cr3+(aq) +3e-
Li(s) with Cr3+(aq)
Which species functions as the oxidizing agent in the following reduction-oxidation reaction? 5 Fe2+(aq) + MnO4-(aq) + 8 H+(aq) --> Mn2+(aq) + 5 Fe3+(aq) + 4 H2O(l)
MnO4-(aq)
When dissolved in water, of HClO4, NH3, KOH, HI, and CH3OH which are bases?
NH3 and KOH
Rank the following elements in order of increasing effective nuclear charge: Na, Mg, Cl, and S.
Na<MG<S<Cl
Rank the following elements in order of increasing nuclear charge: Na, Mg, Cl, and S
Na<Mg<Cl<S
What reagent would distinguish between Ag+ and Fe3+
NaI
Write a balanced net ionic equation for the reaction of NiBr2(aq) with (NH4)2S(aq)
Ni2+(aq)+S2-(aq)--> NiS(s)
Identify the statement that is true about non-electrolytes.
Non-electrolytes do not dissociate in water
What ion is provided when Arrhenius bases dissolve in water?
OH-
Which of the above fourth-shell orbitals is a 4pz orbital?
Orbital (b)
Which species functions as the reducing agent in the following reduction-oxidation reaction?
P(s)
Which one of the following compounds is insoluble in water?
Pb(ClO4)2
Write a balanced net ionic equation for the reaction of Pb(NO3)2(aq) with NaI(aq)
Pb2+(aq)+2I-(aq)-->PbI2(s)
When K2SO4(aq) and Pb(NO3)2(aq) are mixed, a white colored precipitate forms which is
PbSO4
Which of the following is true?
The square of the wave function gives the probability of finding the electron
Arrange the following spectral regions in order of increasing wavelength: infrared, microwave, ultraviolet, invisible.
Ultra<visible<infrared<microwave
Which orbital-filling diagram violates the Pauli exclusion principle?
[Ar] ^^4s ^^^3d^_
Which orbital-filling diagram violates Hund's rule?
[Ar] ^v 4s ^^^3d^_
Molybdenum has an enomalous electron configuration. Write the electron configuration of Mo using shorthand notation
[Kr] 5s1 4d5
What is a quantum of light called?
a photon
For an orbital, a node is
a surface where there is no chance of finding the electron.
The reaction 2 HNO3 (aq) + Ba(OH)2 (aq) --> Ba(NO3)2 (aq) +2 H2O (l) is best classified as a(n)
acid-based neutralization reaction
Light can be made to have a higher intensity by raising its
amplitude
In the reaction 2 H2O2(l) --> 2HO(l) + O2(g) oxygen is
both oxidized and reduced
A quantized variable
can only assume certain values
Which orbitals have two nodal planes passing through the nucleus?
d
The four lines observed in the visible emission spectrum of hydrogen tell us that
only certain energies are allowed fro the electron in a hydrogen atom.
For a multielectron atom, a 3s orbital lies lower in energy than a 3p orbital because
other electrons more effectively shield electrons in the 3p orbital from the nucleus
The combustion reaction CH4(g) + 2 O2(g) --> CO2(g) + 2 H2O(l) can be classified as a(n)
oxidation-reduction reaction
The reaction C6H12O6(s) + 6 O2(g) --> 6 CO2(g) + 6H2O (l) is best classified as a(n)
oxidation-reduction reaction
The reaction Na3PO4(aq) + 3 AgNO3 (aq) --> AgPO4(s) + 3NaNO3 (aq) is best classified as a(n)
precipitation reaction
The intensity of a beam of light is related to its
relative number of photons
The greater the energy of a photon, the
shorter the wavelength and the higher the frequency.
Two electromagnetic waves are represented below. Wave (a) has the
shorter wavelength and higher energy than wave (b).
The subshell designations follow the alphabet after f. What is the first shell in which an h orbital would be allowed?
sixth
Which one of these spheres represents an atom of Sb?
sphere (d)
The name of H2SO3 is
sulfurous acid
