CHEM 1312 Practice Test 5 Rahman

Consider the following types of compounds: (i) amino acid (ii) nitrogen-containing organic base (iii) phosphoric acid (iv) five-carbon sugar From which of the above compounds are the monomers of nucleic acids, called nucleotides, formed? A) none B) (i) and (ii) C) (ii) and (iv) D) (ii), (iii), and (iv) E) all

(ii), (iii), and (iv)

What is the oxidation number of cobalt in [Co(NH3)4F2]? A) +2 B) +1 C) +3 D) -3 E) +6

+2

What are the respective central-metal oxidation state, coordination number, and overall charge on the complex ion in Na2[Cr(NH3)2(NCS)4]? A) +3; 6; +1 B) +1; 6; -2 C) +3; 6; -2 D) +2; 6; -2 E) +2;4; -1

+2; 6; -2

What is the oxidation number of chromium in [Cr(NH3)4Cl2]Cl? A) +3 B) +2 C) 0 D) -2 E) -3

+3

What is the oxidation number of the central metal in [Mo(H2O)5NO3]Cl2 (Fill in the blank)

+3

What is the oxidation state of iron in CaNa[Fe(CN)6]? A) 0 B) +4 C) +3 D) +2 E) +6

+3

The names of complex anions end in A) ium B) -ous C) -o D) -ic E) -ate

-ate

How many chiral carbon atoms does the neopentane (2, 2 - dimethylproane) have? A) 0 B) 1 C) 2 D) 3 E) 4

0

The minimum number of unshared valence electron pairs in the ligands of a coordination compound is A) 4 B) 1 C) 5 D) 2 E) 3

1

Of the 20 amino acides found in our bodies, ___ of them must be ingested because our bodies cannot synthesize sufficient quantities of them (Fill in the blank)

10

How many structural isomers (include all types except optical) can be drawn for C5H10? A) 5 B) 6 C) 7 D) 11 E) 12

11

Cyclohexane has __________ fewer hydrogens than n-hexane. A) 0 B) 1 C) 2 D) 3 E) 4

2

How many isomers are possible for C4H10? A) 1 B) 2 C) 3 D) 4 E) 10

2

How many isomers of C2H2Cl2 are polar? A) None B) 1 C) 2 D) 3 E) it is impossible to tell without more information

2

What is the oxidation number of Ni in [Ni(CN)5] ^3-? A) 2+ B) 1+ C) 3+ D) 5+ E) 4+

2+

The addition of HBr to 2-butene produces __________. A) 2-bromobutane B) 2,3-dibromobutane C) 1,2-dibromobutane D) 1-bromobutane E) no reaction

2-bromobutane

How many isomers are possible for C5H12? A) 1 B) 2 C) 3 D) 4 E) 10

3

A complex of correctly written formula [Pt(NH3)3Br]Br X H20 has which sit of ligands in its inner coordination sphere? A) 3 NH3 and 1 Br- B) 3 NH3, 2 Br- and 1 H2O C) 3 NH3 and 2 Br- D) 3 NH3, 1 Br ^--, and 1 H2O E) 3 NH3

3 NH3 and 1 Br-

What is the name of the compound CH3CH2CH(OH)CH2CH2CH3?

3-Hexanol

How many iron atoms are coordinated in a hemoglobin molecule? A) 4 B) 1 C) 5 D) 2 E) 3

4

The most common coordination numbers are (Fill in the blank)

4 and 6

In photosynthesis, ___ moles of photons are required to form one mole of ___ (Fill in the blank)

48; glucose

What is meant by the prefix tetrakis-, and when is it used? (Fill in the blank)

4; 4 of a ligand

Alkanes with ___ to ___ carbons are found in straight-run gasoline A) 5,12 B) 20, 60 C) 1,5 D) 9, 15 E) 2,3

5,12

The coordination number of cobalt in CoCl3 X 5NH3 is A) 3 B) 8 C) 6 D) 4 E) 2

6

What is the coordination number of the iron atom in CaNa[Fe(CN)6]? (Fill in the blank)

6

The primary ingredient in vinegar is (Fill in the blank)

Acetic acid

Which one of the following is NOT an alcohol? A) cholesterol B) ethylene glycol C) glycerol D) acetone E) ethanol

Acetone

Which one of the following species is a potential polydentate ligand (cheating agent)? A) NH3 B) CN- C) C2O4 ^-2 D) Cl- E) H2O

C2O4 ^-2

___ could be the formula of an alkene A) C17H26 B) C3H6 C) C3H8 D) C6H6 E) CH8

C3H6

Write the formula for 2-methyl-4-propylnonane (Fill in the blank)

CH3-CH2-CH2-CH2-F

In the compound, CaNa[FE(CN)6], what ligands are in the coordination sphere? A) Na+ B) Ca ^2+ C) H2O D) CN- E) none of the above

CN-

What is the ligand in Ca3[Fe(CN)6]2 A) Fe ^3+ B) CN- C) Fe(CN)6 ^3- D) Fe ^2+ E) Ca ^2+

CN-

The most important acidic and basic functional groups in all amino acids are the ___ and the ___ groups respctively (Fill in the blank)

Carboxylic acid; amino

The porphyrin compound that contains Mg(II) is called (Fill in the blank)

Chlorophyll

The general formula of an alkane is A) C2nH2n+2 B) CnH2n C) CnHn D) CnH2n+2 E) CnH2n-2

CnH2n+2

Non-superimposable mirror-image isomers of a substance are called (Fill in the blank)

Enantiomers

Living organisms must expend energy to counter any increase in ___ (Fill in the blank)

Entropy

The chelate effect is best attributed to considerations of which type? A) entropy B) resonance C) enthalpy D) hydration E) hydrogen bonding

Entropy

Large protein molecules that act as catalysts are called___ (Fill in the blank)

Enzymes

A complex that absorbs light at 700 nm will appear A) red B) violet C) orange D) green E) yellow

Green

The correct name for [Ni(NH3)6](NO3)3 is A) dinitrohexaamminenickel (II) B) hexaamminenickel (III) trinitrate C) hexaamminenickel (II) nitrate D) hexaamminenickel (III) nitrate E) dintrohexaamminenickelate (III)

Hexaamminenickel (III) Nitrate

Which substance would be the most soluble in gasoline? A) NaCl B) water C) hexane D) HCl E) NaNO3

Hexane

Two compounds have the same formula and contain an SCN- ligand. In one compound the SCN- ligand is bonded to the metal atom via the N atom and in the other it is bonded via the S atom. These two compounds are examples of ___ isomers (Fill in the blank)

Linkage

The melting and boiling points of hydrocarbons are determined by ___ A) ion-dipole attraction B) ionic bonding C) London forces D) hydrogen bonding E) dipole-dipole attraction

London forces

What metal is complexed in chlorophyll? A) vanadium B) Iron C) magnesium D) chromium E) manganese

Magnesium

In the reaction of nitric acid with benzene, which isomer is formed when a second nitro group is substituted? (Fill in the blank)

Meta

Linkage isomerism would most likely occur when which of the following ligands is present? A) NH3 B) PF3 C) NCS- D) H2O E) Cl-

NCS-

The basic building block of nucleic acis is the ___ A) phosphoric acid B) nuceloside C) ester linkage D) nucleotide E) nitrogen base

Nucleotide

Six- coordinate complexes generally have ___ geometry (Fill in the blank)

Octahedral

Which of the following will display optical isomerism? A) Octahedral [Co(H2NC2H4NH2)3] ^3+ B) Square-Planar [Pt(H2NC2H4NH2)2]^ 2+ C) Octahedral [Co(NH3)5Cl] ^2+ D) Square-planar [Rh(CO)2Cl2] - E) Octahedral [Co(NH3)6] ^3+

Octahedral [Co(H2NC2H4NH2)3] ^3+

What is the purpose of adding sodium tripolyphosphate to a detergent? (Fill in the blank)

To sequester the metal ions in hard water to prevent their interference with the action of the dtergent

Name the compound, [Os(en)3]2[NiCl2Br2]3 (Fill in the blank)

Tris(ethylenediamine)osmium(III) dibromodichloronickelate(II)

The hydrolysis of an ester in the presence of a base is called ___ (Fill in the blank)

Saponification

Name Na[Ru(H2O)2(C2O4)2] (Fill in the blank)

Sodium diaquadioxalatoruthenate (III)

The correct name for Na3[CoF6] is A) sodium hexafluorocobaltate (III) B) trisodium hexakisfluorocobalt (III) C) sodium hexafluorocobaltate (IV) D) trisodium hexakisfluorocobalt (II) E) trisodium hexakisfluorocobalt (IV)

Sodium hexafluorocobaltate (III)

___ is a disaccharide A) Fructose B) Ribose C) Galactose D) Sucrose E) Glucose

Sucrose

Name the compound, Cu(H2O)4 ^2+ (Fill in the blank)

Tetraaquacopper (II)

The molecular geometry of each carbon atom in an alkane is ___ A) tetrahedral B) octahedral C) square planar D) trigonal planar E) trigonal pyramidal

Tetrahedral

What is the most common geometry found in four-coordinate complexes? A) Tetrahedral B) Icosahedral C) Octahedral D) Square Planar E) Trigonal bipyramidal

Tetrahedral

A racemic mixture is A) an equal mixture of both enantiomers of an optically active species B) a mixture of structural isomers C) a mixture of metal ions and ligands in equilibrium D) a mixture of an optically active species with an optically inactive species E) an equal mixture of cis- and trans-isomers

an equal mixture of both enantiomers of an optically active species

Triphenylphosphine is often given the abbreviated formula PPh3. The correct name for Rh(PPh3)3Cl is A) chlorotriphenylphosphinerhodium (I) B) chlorotriphenylphosphinerhodium C) tris(triphenylphosphine)chlororhodium (I) D) chlorotris(triphenylphosphine) rhodium (I) E) chlorotris (triphenylphosphine) rhodate (-I)

chlorotris (triphenylphosphine) rhodium (I)

The formation of aspirin by reacting salicylic acid with acetic acid is a ___ reaction (Fill in the blank)

condensation

Aromatic hydrocarbons ___ A) have sp2 hybridized carbon atoms B) readily undergo addition reactions like alkenes C) contain a series of pi bonds on several consecutive carbon atoms D) undergo substitution reactions more easily than saturated hydrocarbons

contains a series of pi bonds on several consecutive carbon atoms

The secondary valence in metal ion complexes is called the (Fill in the blank)

coordination number

The chelate effect is enhanced by polydentate ligand binding because of the change in (Fill in the blank)

entropy

Which amino acid is NOT chiral? A) isoleucine B) threonine C) alanine D) leucine E) glycine

glycine

EDTA is ___-dantate ligand A) tetra B) bi C) hexa D) mono E) tri

hexa

Ethers can be made by condensation of two ___ molecules by splitting out a molecule of water A) alkyne B) aldehyde C) alcohol D) olefin E) ketone

Alcohol

What general class of compounds is also known as olefins? A) ketones B) alkenes C) alkanes D) alkynes E) aromatics

Alkenes

Changes in the coordination sphere of a complex compound may lead to changes in ___ A) Chemical properties B) Color C) Physical properties D) stability E) all of the above

All of the above

When petroleum is distilled to separate the components by boiling point, the component with the highest boiling point is called ___ A) kerosene B) gasoline C) gas D) asphalt E) paraffin

Asphalt

The following reaction would produce a(n) ___ R-OH+R'COOH -> A) Aldehyde B) ester C) alcohol D) ether E) ketone

Ester

Which of the following compounds does NOT contain a C = O bond? A) aldehydes B) ethers C) esters D) amides E) ketones

Ethers

The chelate effect must always occur with positive enthalpy change (True or False)

FALSE

Aldehydes are less reactive than ketones (True or false)

False

Green and orange are complementary colors (True or False)

False

Which one of the following is a mono saccharide? A) sucrose B) maltose C) fructose D) lactose E) none of the above

Fructose

The principal difference between fructose and glucose is that ___ A) glucose is a chiral and fructose is not B) fructose is a disaccharide and glucose is a monosaccharide C) fructose is chiral and glucose is not D) fructose is a monosaccharide and glucose is a disaccharide E) fructose is a ketone sugar and glucose is an aldehyde sugar

Fructose is a ketone sugar and glucose is an aldehyde sugar

The "dentation" of a ligand is defined by A) the total number of lone pairs of electrons it possesses B) how many metal ions it can sequester from solution C) how many electron donor atoms it utilizes to form coordinate bonds to the central metal ion D) how many "dents" or "deceptions" there are in the coordination sphere of a complex species it forms E) none of the above

How many electron donor atoms it utilizes to form coordinate bonds to the central metal ion

The double helix of DNA is stabilized mainly by A) ionic bonds B) ion-dipole bonds C) covalent bonds D) hydrogen bonds E) ester bonds

Hydrogen bonds

Which of the following compounds do NOT contain an sp3 hybridized oxygen atom? A) esters B) aclohols C) ketones D) water E) ethers

Ketones

The condensation reaction of a carboxyl group of one amino acid and the amino group of a second amino acid results in the formation of a ___ (Fill in the blank)

Peptide bond

The general formula of an aldehyde is A) R-CHO B) R-O-R' C) R-CO-OH D) R-CO-OR' E) R-CO-R'

R-CHO

The general formula of a carboxylic acid is ___ A) R-CO-OR' B) R-CO-R' C) R-O-R' D) R-H E) R-CO-OH

R-CO-OH

What is the general formula for a ketone? A) R-CO-R' B) R-O-R C) R-CO-OH D) R-OH E) R-CHO

R-CO-R'

Alcohols are hydrocarbon derivatives in which one or more hydrogens have been replaced by a hydroxyl functional group. __________ is the general formula of an alcohol A) R-O-R B) R-CO-H C) R-CO-R D) R-OH-OH E) R-OH

R-OH

Rotation around a carbon-carbon double bond is difficult, requiring energy but it is a key process in the chemistry of ___ (Fill in the blank)

Vision

Non superimposable isomers are ___ isomers (Fill in the blank)

optical, chiral, enantiometric

The hybridization of the central carbon atom in an aldehyde is A) sp4 B) sp3 C) sp2 D) d2sp3 E) sp

sp2

What is the purpose of adding EDTA to prepared foods? A) to prevent dissolution of the container in the food when stored for long periods of time B) to complex iron(III) ions so they can catalyze protein decomposition on cooking C) to complex trace metal ions that catalyze decomposition reactions D) to aid in browning of the surface during cooking E) to keep ions such as CA ^2+ in solution so the foods look good

to complex trace metal ions that catalyze decomposition reactions

Linkage isomerism can only occur A)in cis-isomers of octahedral complexes B) with ligands that have more than one possible donor atom C) with tetrahedral complexes D) with cobalt complexes E) with coordination number 6

with ligands that have more than one possible donor atom