Chem 1172 chapter 23

what is the electron configuration of a Fe2+ ion

(Ar)3d6

The electron configuration of a Co2+ ion is

(Ar)3d7

what is the electron configuration of a Mn atom?

(Ar)4s23d5

what is the electron configuration of a Cr atom?

(Ar)4s3d5

What is the correct formula for the dichlorobis(ethylenediamine)cobalt(III) ion?

(Co(en)2(cl)2)+

Write down the formula for the following compound: dichlorotetrakis(ethylenediamine)iron (III) nitrate

(Fe(en)4cl2)No3, because nitrate is No3-

Which one is more paramagnetic between [FeF 6] 3- and [Fe(CN) 6] 3- ?

(FeF6)3-

in (Fe(Cn)6)4- the oxidation number of the central ion is?

+2

What is the correct oxidation number of the transition metal atom in [Co(NH3)2(H2O)2Cl2]+?

+3

How many electrons are there in the d orbitals of the central atom of the complex ion [Cr(NH3)4Cl2]+?

3

In the complex ion [Co(en)2Br2]+, the oxidation number of Co is

3

What is the oxidation number of the central atom in the coordination compound [Co(en)3]2(SO4)3

3

How many unpaired spins are in [Mn(H 2O) 6] 3+? (H 2O is a weak-field ligand.)

4

What is the oxidation number of the central atom in the complex ion [Pt(en)2Cl2]2+?

4

What is the correct coordination number of the transition metal atom in [Co(NH3)2(H2O)2Cl2]+?

6

What is the total number of ligands in question number 19?

6

in Kr4(fe(Cn)6) how many electrons are in the d orbital of the central metal

6

A. the atmosphere B. coal C. natural gas D. oil 33. What is the source of the nitrogen in the NOx emitted from fossil fuel combustion?

A

How many 3d electrons does a V3+ ion have? A. 2 B. 3 C. 4 D. 5 E. 6

A

H2 is not found in Earth's atmosphere because A. It reacts with atmospheric oxygen to produce water. B. Earth's gravitational pull is not strong enough to retain H2 in the atmosphere. C. H2 dissociates at atmospheric temperatures. D. It reacts with atmospheric nitrogen to form ammonia. E. It reacts with atmospheric carbon dioxide to form carbonic acid.

B

Halogens (e.g. F, Cl, Br, and I) are A. strong acids B. oxidizing agents C. reducing agents D. strong bases

B

Methane is approximately 23 times more powerful than carbon dioxide as a greenhouse gas. Which is not a significant source of methane emissions? A. The digestive systems of ruminants (cows, sheep, etc.) B. Rice cultivation C. Automobile exhaust D. Decaying wetland vegetation

B

The ion [Co(NH3)6]2+ is octahedral and high spin. This complex ion is A. paramagnetic with 1 unpaired electrons. B. paramagnetic with 3 unpaired electrons. C. paramagnetic with 4 unpaired electrons. D. paramagnectic with 5 unpaired electrons. E. diamagnectic with no unpaired electrons.

B

The ion with a half-filled set of d-orbitals is _____. A. Fe2+ B. Mn2+ C. V3+ D. Ti2+ E. Sc2+

B

What is the correct formula for sodium hexanitrocobaltate (II)? A. [Co(NO2)6]Na3 B. Na4[Co(NO2)6] C. Na3[Co(NO2)6] D. [Co(NO)6]Na E. Na[Co(NO2)6]

B

Which complex ion would absorb light with the longest wavelength? A. [Co(H2O)6]2+ B. [Co(NH3)6]2+ C. [CoF6]4- D. [Co(CN)6]4- E. [Co(en)6]2+

C

Which oxide is acidic? A. BaO B. Al2O3 C. CO2 D. K2O

C

Identify each species in terms of greenhouse gas versus non-greenhouse gas. H2, O3, N2, CO2, O2, CH4, N2O, H2O, and CFCs

Greenhouse- all others Non- h2 n2 o2

Which of the following is NOT named correctly? A. HCl - hydrochloric acid D. H2SO4 - sulfuric acid G. HNO2 - nitrous acid B. HNO3 - nitric acid C. H3PO4 - phosphoric acid E. H2CO3 - carbonic acid F. H2SO3 - sulfurous acid H. No answer because all of these are correct

H

Carbonic acid

H2CO3

Which one of the following is the best electric conductor?

Mg

Which oxide is basic?

MgO

I am a colorless gas with a pleasing odor and sweet taste. I am often called "laughing gas" because I make people giddy when they inhale me. Who am I?

N2O Nitrous oxide

NO

Nitric oxide

HNO2

Nitrous acid

Which one is leastly related to chelating agents?

They have four donor atoms to hold unto the central metal atom like a claw.

Name the following compound: [Co(en)2Br2]Br

dibromobis(ethylenediamine)cobalt(III) bromide

Two well-known complex ions containing Ni are [Ni(H2O)6]2+, which is green and [Ni(en)3]2+, which is purple. Which one of the following statements is true? You may need to look up the figure of a color wheel with wavelengths in the textbook. A. the CF splitting energy () is greater for [Ni(en)3]2+ than for [Ni(H2O)6]2+. B. [Ni(en)3]2+ absorbs energy in the red region of the spectrum. C. Both complex ions are diamagnetic D. [Ni(H2O)6]2+ transmits light with wavelengths of approximately 650-700 nm. E. The green complex absorbs green light.

A

Which has the greatest GWP value? A. N2O B. CO2 C. CH4 D. N2

A

Which of the following is a list of LiH, CH4, and NH3 in the order of decreasing boiling points? A. LiH > NH3> CH4 B. NH3 > CH4 > LiH C. CH4 > LiH > NH3

A

Chlorofluorocarbons rise to the stratosphere and A. react directly with stratospheric ozone to destroy it. B. interact with UV energy to produce free radicals that destroy ozone. C. interact with UV energy to produce free radicals that react with oxygen to create ozone. D. react with free radicals to remove carbon dioxide.

B

Fluoride ion (F-) is a weak-field ligand. Cyanide ion (CN-) is a strong-field ligand. Which statement is correct associated with the [FeF6]3- and [Fe(CN)6] 3- complex ions? A.Complex ion [FeF6]3- is less paramagnetic than complex ion [Fe(CN)6] 3-. B.Complex ion [Fe(CN) 6]3- has less lone (unshared) electrons than complex ion [FeF6]3-. C. Complex ion [FeF6]3- is in lower spin than complex ion [Fe(CN) 6]3-. D. The light energy absorbed by complex ion [FeF6]3- is greater than that by complex ion[Fe(CN)6] 3-. E. None of these

B

The electron configuration of a Cr3+ ion is A. [Ar]3d5 B. [Ar]4s13d2 C. [Ar]3d3 D. [Ar]4s13d5 E. [Ar]4s23d4

C

The Cr 3+ ion forms octahedral complexes with three neutral ligands X, Y, and Z. The color of CrX 6 3+ is blue; the color of CrY 6 3+ is yellow; the color of CrZ 6 3+ is red. Which statement is false?

CrZ 6 3+ ion absorbs the light with the shortest wavelength.

A bidentate ligand always A. has bonds formed to two metal ions. B. has a charge of +2 or -2. C. forms complex ions with a charge of +2 or -2. D. has two donor atoms. E. has medical uses.

D

In the coordination compound [Co(en)2Cl2]Cl, (where en = ethylenediamine), the coordination number and oxidation number of the central atom are, respectively A. 4, +3. B. 6, +2. C. 4, +2. D. 6, +3. E. 4, +1.

D

A solution of complex ion [Ni(CO)6]2+ has purple color, and a solution of complex ion [Ni(en)3]2+ has green color. The wavelengths of the visible light range from 400 nm to 700 nm; purple at around 400 nm and green at around 500 nm. Which one of the following statements is true? A. The crystal field splitting () of [Ni(en)3]2+ is greater than that of [Ni(CO)6]2+. B. The crystal field splitting () of [Ni(en)3]2+ is the same as that of [Ni(CO)6]2+ because the two complex ions have the same central transition metal, Ni. C. The energy of the absorbed light by the complex ion [Ni(CO)6]2+ is the same as the crystal field splitting of the complex ion [Ni(en)3]2+. D. The green complex ion absorbs green light. E. None of these.

E

Select the statement that is NOT related to amalgam. (1). Amalgam is a preparation procedure separating the desired mineral from ore. (2). Amalgam is a purification procedure eliminating impurities. (3). Amalgam is an alloy of mercury with another metal (4). Amalgam is the production procedure through a reduction process.

E

Select the statement which does not explain correctly about d orbitals of the transition metals A.In the absence of external disturbance all d orbitals of a free metal atom have the same energy. B.d orbitals of the central metal atom in a complex ion experience electrostatic repulsion because of the metal-ligand interactions. C.The magnitude of the electrostatic repulsion above, i.e. the option B, depends on the orientation of d orbitals of the central metal atom. D.As a result of the metal-ligand interactions, d orbitals of the central metal atom can be split into different energy levels. E.The crystal field splitting is the energy difference between two sets of d orbitals in a central metal atom when ligands are absent.

E

Which statement is false? A. The global atmospheric lifetime characterizes the time required for a gas added to the atmosphere to be removed. B. The global warming potential (GWP) is a number that represents the relative contribution of a molecule of the atmospheric gas to global warming. C. The GWP of carbon dioxide (CO2) is assigned the reference value of 1. D. All other greenhouse gases are indexed with respect to the GWP value of carbon dioxide. E. The GWP value of methane (CH4) gas is 0.2, meaning that its relative importance to global warming is only a fifth of carbon dioxide.

E

Select one that does not have correct relation between the formula and its name. A. N2O - nitrous oxide B. NO - nitric oxide C. NO2 - nitrogen dioxide D. HNO3 - nitric acid E. NO2- - nitrite F. NO3- --pernitrate

F

Which one is not correctly paired? A. CN- - monodentate B. NH3 - monodentate C. oxalate - bidentate D. ethylenediamine (en) - bidentate E. H2O - monodentate F. EDTA - polydentate G. no answer because all options are correctly paired.

G

rank strength of field ligands

I Br Cl OH F H2O NH3 en CN CO

N20

nitrous oxide

N2O

nitrous oxide

The burning of coal produces sulfur dioxide, SO2, a pollutant that slowly reacts in air to form SO3. Sulfur trioxide dissolves into airborne water droplets to form a very corrosive solution of sulfuric acid. Which is a product of burning coal that hastens the transformation of sulfur dioxide into sulfur trioxide?

particles of ash

What is the correct sequence of the recovery ofa metal from its ore?

preparation of the ore --> production of the metal --> purification of the metal

color wavelengths

purple yellow, blue orange, green red.

Why does the complex ion [Zn(H2O)2 (en)2]2+ not develop color?

since Zn2+ in this complex has its 3d subshell completely filled with 10 electrons (i.e., 3d10), no electron can jump to an orbital at higher energy level. This means light cannot be absorbed by Zn2+. Because there is no absorption of light, there is no color developed.

Write down the name of Na3[Co(NO2)6]

sodium hexanitrocobalate (111)

H2SO3

sulfurus acid

Name the following compound: [Co(NH3)4Cl2]Cl

tetraaminedichlorocoablt (111) chloride

Write down the name of [Co(en)3]2(SO4)3

tris(en)cobalt (111) sulfate