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