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Chemistry
Q:
How many geometric isomers may exist for the square-planar complex ion [Pt(OH)2(NH3)2]2-?A.2B.3C.4D.5E.6
Q:
Which one of the following complex ions has an optical isomer?A.[Cu(CN)4]2-B.[Zn(phen)2]2+C.[Zn(NH3)2en]2+D.[Co(H2O)4en]2+E.[Ni(en)3]2+
Q:
Which of the following compounds may have linkage isomers?
A.[Ni(H2O)4Cl2]Cl
B.[Ni(NH3)4Cl2]NO2
C.[Ni(H2O)5(SCN)]SO4
D.[Ni(H2O)5Cl](SCN)2
E.[Ni(NH3)4Cl2]Cl
Q:
Which of the following species have geometric isomers: [Fe(en)Cl4]-, [Fe(en)2Cl2]+, and [Fe(en)2BrCl]+?A.[Fe(en)Cl4]- onlyB.[Fe(en)2Cl2]+ onlyC.[Fe(en)2BrCl]+ onlyD.[Fe(en)2Cl2]+ and [Fe(en)2BrCl]+E.[Fe(en)Cl4]-, [Fe(en)2Cl2]+, and [Fe(en)2BrCl]+
Q:
Which of the following pairs of coordination compounds are coordination isomers?
A.[Cr(H2O)6]SO4 and [Cr(NH3)6]SO4
B.[Cr(NH3)5Cl]SO4 and [Cr(NH3)5SO4]Cl
C.[Co(NH3)4(H2O)2]Cl2 and [Co(NH3)2(H2O)4]Cl2
D.[Cr(NH3)6](NO3)2 and [Fe(NH3)6](NO3)3
E.[Cr(H2O)6]Cl2 and [Fe(H2O)6]Cl2
Q:
What are the possible geometries of a metal complex with a coordination number of 4?
1/ square planar
2/ tetrahedral
3/ octahedral
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
Q:
What is the formula for potassium diamminetetrachlorovanadate(III)?
A.[KV(NH3)2Cl4]
B.K2[V(NH3)2Cl4]
C.K[V(NH3)2Cl4]
D.[KV(NH3)2]Cl4
E.K[V(NH3)2]Cl4
Q:
What is the formula for dicyanobis(ethylenediamine)zirconium(IV) nitrate?
A.Zr[(CN)2(NO3)2(en)2]
B.[Zr(CN)2(NO3)2(en)2]
C.(NO3)2[Zr(CN)2(en)2]
D.[Zr(CN)2(en)2](NO3)2
E.[Zr(NO3)2(en)2](CN)2
Q:
What is the name of the compound having the formula [Ru(CO)6](ClO4)3?
A.hexacarbonmonoxideruthenium(III) perchlorate
B.hexacarbonmonoxideruthenium(II) chloro tetroxide
C.trichloratehexacarbonylruthenate(III)
D.hexacarbonylruthenium(II) chlorate
E.hexacarbonylruthenium(III) perchlorate
Q:
What is the name of the compound having the formula (NH4)2[Cu(CN)4]?
A.ammonium tetracyanocuprate(II)
B.diammonium tetracyanocuprate(II)
C.bisamminetetracyanocuprate(II)
D.tetracyanobisamminecuprate(II)
E.tetracyanocuprate(II) ammonia
Q:
What is the name of the compound having the formula [Cr(en)2(H2O)2]SO4?
A.dihydroxydiethlyenediamminechromate(II) sulfate
B.diaquabis(ethylenediamine)sulfatochromate(IV)
C.bis(ethylenediamine)diaquachromium(II) sulfato
D.diaquabis(ethylenediamine)sulfatochromium(II)
E.diaquabis(ethylenediamine)chromium(II) sulfate
Q:
What is the name of the compound having the formula K2[PtCl4]?
A.potassium chloroplatinate(II)
B.potassium tetrachloroplatinate(II)
C.potassium chloroplatinate(IV)
D.potassium platanotetrachlorate(II)
E.dipotassium tetrachloroplatnum(II)
Q:
What is the oxidation state of molybdenum in [Mo(H2O)5OH]Cl2?
A.+1
B.+2
C.+3
D.+4
E.+6
Q:
What is the oxidation state of iron in K4[Fe(CN)6]?A.-1B.+1C.+2D.+3E.+4
Q:
What is the coordination number of the central metal ion in [Cr(en)2(OH)2]NO3? (en = H2NCH2CH2NH2)
A.0
B.2
C.4
D.6
E.7
Q:
What is the coordination number of the central metal ion in [Ni(NH3)4(H2O)2]Cl2?
A.0
B.2
C.4
D.6
E.8
Q:
All of the following molecules or ions can act as polydentate ligands EXCEPT ____.A.phenanthroline; C12H8N2B.acetylacetate ion; CH3COCHCOCH3-C.oxalate ion; C2O42-D.ethylenediamine; H2NCH2CH2NH2E.dimethylamine; (CH3)2NH2
Q:
Which molecule or ion does NOT act as a ligand?A.H2OB.NH4+C.Cl-D.C2O42-E.CN-
Q:
Ions such as [Co(H2O)6]3+ and [Ag(CN)2]- are called ____.A.ligandsB.Lewis basesC.chelatesD.alloysE.coordination complexes
Q:
Most copper minerals are mined as ________.
A.fluorides
B.sulfides
C.oxides
D.nitrates
E.silicates
Q:
Copper ores are enriched to increase the percentage of copper by a process called ____.
A.electrolysis
B.flotation
C.roasting
D.tempering
E.filtering
Q:
The flexibility, strength, hardness, and malleability of carbon steel is affected by a heating and cooling process called ____.
A.tempering
B.flotation
C.reduction
D.oxidation
E.recrystallization
Q:
The iron produced in a blast furnace contains significant impurities of carbon, phosphorus, and sulfur. These impurities are removed in a basic oxygen furnace, which converts the impurities to ________.
A.CO2, P4O10, and SO2
B.CS2 and P4S3
C.H2CO3, H3PO4, and H2SO3
D.H2CO3, H3PO4, and H2SO4
E.CH4, PH3, and H2S
Q:
What two of the following elements or compounds are used to reduce Fe2O3 to Fe in a blast furnace?
A.H2(g) and C(s)
B.Cl2(g) and CO2(g)
C.C(s) and CO(g)
D.CaSiO3(s) and CaO(s)
E.CO2(g) and CaO(s)
Q:
All of the following metals are generally found in nature as either oxides or sulfides, EXCEPT ____.
A.Fe
B.Au
C.Ni
D.Cr
E.Hg
Q:
All of the following metals may be found in nature as free elements EXCEPT ____.
A.Ir
B.Au
C.Pt
D.Ti
E.Rh
Q:
Ores are often found mixed with impurities such as sand and clay. In metallurgy, these impurities are called ____.
A.gangue
B.alloys
C.slags
D.roasts
E.precipitates
Q:
If an element can be obtained profitably from a mineral, the mineral is called a(n) ____.
A.gangue
B.ore
C.slag
D.roast
E.alloy
Q:
The product of the oxidation of iron in most soil in the absence of excess oxygen is black magnetite. The chemical formula of this compound is ____.
A.FeO
B.FeO2
C.Fe2O3
D.Fe3O2
E.Fe3O4
Q:
Which of the following statements is/are CORRECT?
1/ The atomic radii of transition metals decrease initially, then increase as one moves from left to right across a period of the periodic table.
2/ The atomic radii of the d-block elements in the 5th and 6th periods in each group are almost identical.
3/ The densities of the 6th period transition metals are greater than those of either the 4th or 5th period transition metals.
A.1 only
B.2 only
C.3 only
D.1 and 2
E.1, 2, and 3
Q:
Which element from the first transition series does NOT react with hydrochloric acid?
A.titanium
B.chromium
C.cobalt
D.nickel
E.copper
Q:
What is the highest oxidation state for chromium?
A.+2
B.+4
C.+6
D.+8
E.+10
Q:
Identify the element with the ground state electron configuration [Xe]4f145d66s2.
A.Ir
B.Ta
C.Os
D.Ru
E.Au
Q:
Which of the following ions have an [Ar]3d5 electron configuration: Co2+, Mn2+, and Fe3+?
A.Co2+ only
B.Mn2+ only
C.Fe3+ only
D.Co2+ and Fe3+
E.Mn2+ and Fe3+
Q:
Which ion produces the red color in rubies?
A.Mn2+
B.Zr4+
C.Pd2+
D.Cr3+
E.Ti4+
Q:
The white in most white paints comes from ________.
A.TiO2
B.CdS
C.Fe4[Fe(CN)6]3 14 H2O
D.KMnO4
E.AgI
Q:
Iron, _____, and sulfur form the reactive portion of nitrogenase, a biological catalyst used by nitrogen-fixing organisms.
A.Fe
B.Co
C.Zn
D.Cd
E.Mo
Q:
Which element has the highest density?
A.Zn
B.Y
C.Os
D.Fe
E.Ag
Q:
One commercial method of producing Cl2 is by electrolysis of aqueous NaCl.NaCl(aq) + 2 H2O() Cl2(g) + 2 NaOH(aq) + H2(g)Owing to environmental concerns, some manufacturers are shifting to the soda-lime method for NaOH production. Explain why this method is environmentally preferred. Write a balanced chemical equation for the production of NaOH from soda ash and lime.
Q:
Concentrated nitric acid reacts with copper to form NO2(g). Dilute nitric acid reacts with copper to form NO(g). Why does the reaction involving the dilute acid give a different nitrogen oxide than the concentrated acid?
Q:
A class of aluminosilicate, called a(n) ________, contains regularly spaced holes and cavities. This type of aluminosilicate is often used as a catalyst.
Q:
The primary product of the reaction of potassium and oxygen is ________. This compound is used in oxygen generators.
Q:
Silicon is purified in a process called ________, where a narrow segment of a silicon rod is melted and allowed to slowly recrystallize.
Q:
Give two examples of the allotropes of elemental oxygen.
Q:
A(n) ________ reaction is one where an element or compound is simultaneously oxidized and reduced.
Q:
Anhydrous hydrogen fluoride is used in all of the following applications EXCEPT
A.etching fluorescent light bulbs.
B.the production of refrigerants.
C.the reduction of alkali and alkaline earth metals.
D.the production of plastics.
E.the production of herbicides.
Q:
The most reactive nonmetallic element is ____. This element has been shown to form compounds with every other element except He and Ne.
A.oxygen
B.fluorine
C.lithium
D.phosphorus
E.carbon
Q:
What is the molecular formula of chlorous acid?
A.HClO
B.HClO2
C.HClO3
D.HClO4
E.HCl
Q:
Ammonium perchlorate can decompose violently according to the chemical equation below.
2 NH4ClO4(s) N2(g) + Cl2(g) + 2 O2(g) + 4 H2O(g)
What volume of chlorine gas is produced by the decomposition of 120 g NH4ClO4 at 650 K and 1.0 atm? (R = 0.08206 Latm/Kmol)
A.27 L
B.54 L
C.91 L
D.110 L
E.3200 L
Q:
Write a balanced chemical equation for the roasting of CuS.
A.CuS(s) + 2 HCl(aq) CuCl2(aq) + H2(g) + S(s)
B.CuS(s) + O2(g) CuO2(s) + S(s)
C.CuS(s) + O2(g) CuO(s) + SO(g)
D.CuS(s) + 2 HCl(aq) CuCl2(aq) + H2S(g)
E.2 CuS(s) + 2 O2(g) 2 CuO(s) + SO2(g)
Q:
Which of the following statements is/are CORRECT?
1/ The most stable allotrope of sulfur is orthorhombic sulfur, which consists of 8-member rings of sulfur atoms.
2/ Diatomic sulfur, S2, is the most common allotrope of sulfur. Typical air samples contain between 0.5 and 2.0% S2(g).
3/ Plastic sulfur is an allotrope of the element that consists of long chains of sulfur atoms.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
Q:
Pure oxygen can be produced by the catalyzed decomposition of potassium chlorate. Write a balanced chemical equation for this reaction.
A.KClO3(s) KClO(s) + O2(g)
B.2 KClO3(s) 2 K(s) + Cl2(g) + 3 O2(g)
C.2 KClO3(s) 2 KCl(s) + 3 O2(g)
D.2 KClO3(s) 2 KClO2(s) + O2(g)
E.KClO3(s) K(s) + ClO(g) + O2(g)
Q:
In the United States, most sulfur is obtained from
A.the reduction of cinnabar, HgS.
B.S8 deposits along the Gulf of Mexico.
C.the reduction of iron pyrite, FeS2.
D.the reduction of copper sulfide, CuS.
E.the oxidation of H2S gas.
Q:
Which of the following statements is INCORRECT?
A.Phosphoric acid gives a tart taste to carbonated beverages such as colas.
B.Sodium phosphate, Na3PO4, is a relatively strong base used in paint strippers.
C.Ca(H2PO4)2H2O is used as an acid leavening agent in baking powder.
D.Ca3(PO4)2 is a dark green compound used in latex paints.
E.Calcium monohydrogen phosphate is an abrasive and polishing agent in toothpaste.
Q:
The active ingredients in "strike anywhere" matches are ____ and the powerful oxidizing agent KClO3(s).
A.N2H4
B.P4O10
C.Mg3N2
D.P4S3
E.(HPO3)3
Q:
Phosphorus was first isolated in 1669 by Hennig Brandt, a German alchemist. Brandt was able to isolate approximately 30 grams of phosphorus from 60 gallons of ________.
A.sea water
B.Chilean saltpeter
C.urea
D.honey
E.urine
Q:
Which of the following nitrogen oxides are free radicals: NO, N2O, NO2, and/or N2O3?
A.NO and N2O
B.N2O and NO2
C.NO2 and N2O3
D.NO and NO2
E.N2O and N2O3
Q:
Hydrazine, N2H4, is produced by the Raschig process-the oxidation of ammonia with alkaline ____.A.HNO3(aq)B.NaOCl(aq)C.N2(g)D.HPO42-(aq)E.N2O(g)
Q:
Nitric acid decomposes slowly in sunlight with nitrogen dioxide and oxygen as reduction and oxidation products, respectively. Write a balanced chemical equation for this reaction.
A.HNO3(aq) NO2(g) + 1/2 O2(g)
B.HNO3(aq) NO2(g) + 1/2 O2(g) + H+(aq)
C.2 HNO3(aq) 2 NO2(g) + O2(g) + H2(g)
D.4 HNO3(aq) 2 NO2(g) + + N2(g) + 3 O2(g) + 2 H2O(g)
E.4 HNO3(aq) 4 NO2(g) + O2(g) + 2 H2O(g)
Q:
Dinitrogen monoxide, or laughing gas, can be made by decomposing ammonium nitrate at 250 C. Write a balanced equation for this reaction.
A.NH4NO3(s) N2O(g) + 2 H2(g) + O2(g)
B.NH4NO3(s) + 2 N2(g) 3 N2O(g) + 2 H2(g)
C.NH4NO3(s) N2O(g) + 2 H2O(g)
D.2 NH4NO3(s) N2O(g) + 2 HNO2(g) + H2O(g) + 2 H2(g)
E.3 NH4NO3(s) N2O(g) + 2 N2(g) + 8 H2O(g)
Q:
In which of the following compounds does the oxidation number of the nitrogen atom(s) equal +3?
A.NH3
B.N2O4
C.N2H4
D.N2O
E.N2O3
Q:
The Ostwald process is an industrial method of producing ____ from the oxidation of ____.
A.nitric acid, ammonia
B.ammonia, nitric acid
C.ammonia, nitrogen
D.nitric acid, nitrogen
E.dinitrogen monoxide, nitrogen
Q:
The only acid that decomposes silicon dioxide is ____.
A.CF3CO2H
B.H2SO4
C.HBr
D.HF
E.HClO4
Q:
Which of the following statements is INCORRECT?
A.Quartz is a form of silicon dioxide that is used for controlling the frequency of radio and television transmissions.
B.Silica gel, a noncrystalline for of SiO2, is used to keep electronics dry.
C.Passing beer through a bed of silica gel removes small particles that cause cloudiness.
D.Gaseous SiO2 is a linear molecule with silicon-oxygen double bonds and a boiling point slight below 0 C.
E.Silicon dioxide is resistant to attack from all acids except HF.
Q:
Quartz is the pure crystalline form of
A.silica, SiO2.
B.sodium silicate, NaSiO4.
C.calcium orthosilicate, Ca2SiO4.
D.silicon tetrachloride, SiCl4.
E.silicon carbide, SiC.
Q:
Which of the following statements is INCORRECT?
A.Carbon is classified as a nonmetal.
B.Silicon is classified as a metalloid.
C.Germanium is classified as a metal.
D.Tin is classified as a metal.
E.Lead is classified as a metal.
Q:
The building block of silicate minerals is the
A.linear SiO unit.
B.the bent SiO2 unit.
C.trigonal-bipyramidal SiO5 unit.
D.tetrahedral SiO4 unit.
E.the linear SiO2 unit.
Q:
Which of the following statements concerning boron compounds is INCORRECT?
A.More than 20 neutral boron hydrides (having formulas BxHy) are known to exist.
B.The two boron atoms in B2H6 are connected by 3-center 2-electron B-H-B bridges.
C.Borax, Na2B4O710 H2O, is used as a low-melting flux in metallurgy.
D.Sodium borohydride, NaBH4, is a reducing agent used in organic chemistry.
E.Diborane, B2H6, is the powerful rocket fuel that is used to launch the space shuttle.
Q:
In what way is cryolite (Na3AlF6) used in the production of aluminum?
A.Cryolite is a catalyst, it increases the rate of aluminum reduction.
B.Cryolite-bauxite mixtures melt at lower temperatures than pure bauxite.
C.Cryolite makes aluminum more corrosion resistant.
D.Cryolite is reduced to aluminum at the cathode.
E.Cryolite is oxidized to F2(g) at the anode.
Q:
Who developed the process for obtaining aluminum from bauxite ore?
A.Antoine Lavoisier
B.Fritz Haber
C.Michael Faraday
D.Herman Frasch
E.Charles Hall
Q:
Molten Al2O3 is reduced by electrolysis at low potentials and high currents. If 7.5 103 amperes of current is passed through molten Al2O3 for 12.0 hours, what mass of Al is produced? Assume 100% current efficiency.
A.5.0 102 g
B.3.0 104 g
C.9.1 104 g
D.2.7 105 g
E.3.1 106 g
Q:
Aluminum is resistant to corrosion because
A.the surface of aluminum is coated with unreactive AlN.
B.the surface of aluminum is coated with unreactive Al2O3.
C.aluminum is a noble metal.
D.aluminum has the greatest density of all naturally occurring metals.
E.aluminum has a large positive standard reduction potential.
Q:
Oxides of the alkaline earth family form ____ upon reaction with water.
A.basic solutions
B.acidic solutions
C.alkaline earth hydrides
D.oxygen gas
E.hydrogen gas
Q:
At high temperatures limestone decomposes according to which balanced chemical equation?
A.Ca(OH)2(s) CaO(s) + H2O(g)
B.2 CaO(s) 2 Ca(s) + O2(g)
C.CaCO3(s) CaO(s) + CO2(g)
D.Ca(OH)2(s) CaH2(s) + O2(g)
E.2 CaCO3(s) 2 Ca(s) + O2(g) + CO2(g)
Q:
Which of the following statements is INCORRECT?
A.Diagnostic imaging of the human digestive tract often requires a patient to consume a slurry of BaSO4(s), a compound that contains the toxic Ba2+ ion.
B.Hydroxyapatite is a calcium containing compound that is the main component of tooth enamel.
C.Beryllium is toxic. Exposure (by breathing) to beryllium can cause berylliosis.
D.Most magnesium is obtained from seawater, where it is present at a roughly 0.05 M concentration.
E.Calcium is the central element in chlorophyll.
Q:
Write a balanced chemical equation for the reaction of lime and water to form slaked lime.
A.CaO(s) + 2 H2O() CaCO3(s) + 2 H2(g)
B.CaO(s) + H2O() Ca(OH)2(s)
C.Ca3(PO4)2(s) + 2 H2O() 2 CaHPO4(aq) + Ca(OH)2(aq)
D.CaCO3(s) + H2O() Ca(s) + H3O+(aq) + CO2(g)
E.CaCO3(s) + H2O() CaO(s) + H2CO3(aq)
Q:
Which of the following statements are CORRECT?
1/ Chili saltpeter is a common name for NaNO3.
2/ Trona is a common name for Na2CO3NaHCO32 H2O.
3/ Soda ash is a common name for Na2CO3.
A.1 only
B.2 only
C.3 only
D.1 and 3
E.1, 2, and 3
Q:
Write a balanced chemical equation for the reaction of potassium and water.
A.K(s) + H2O() KO(s) + H2(g)
B.2 K(s) + 2 H2O() 2 KOH(aq) + H2(g)
C.2 K(s) + 2 H2O() K2O2(s) + 2 H2(g)
D.2 K(s) + H2O() K2O(s) + H2(g)
E.4 K(s) + 2 H2O() 4 KH(s) + O2(g)
Q:
Write a balanced chemical equation for the electrolysis of brine (i.e., salt water).
A.2 NaCl(aq) + 2 H2O() 2 Na(s) + 2 HCl(aq) + O2(g)
B.2 NaCl() 2 Na() + Cl2(g)
C.2 NaCl(aq) + O2(g) Na2O2(s) + Cl2(g)
D.4 NaCl(aq) + O2(g) 4 Na(s) + 2 OCl2(g)
E.2 NaCl(aq) + 2 H2O() Cl2(g) + 2 NaOH(aq) + H2(g)
Q:
Which group 1A metal is the strongest reducing agent?
A.Li
B.Na
C.K
D.Rb
E.Cs