Choose the Most Metallic Element

CHE 160

REVIEW CH #19-22

Choose the most metallic element.

a) N

b) P

c) As

d) Sb

e) Bi

Choose the most metallic element.

a) N

b) P

c) As

d) Sb

e) Bi

Which Group 5A element cannot form molecules with five covalent bonds?

a) N

b) P

c) As

d) Sb

e) Bi

The process of transforming N2 to a form usable by animals and plants is called

a) nitrogen fixation.

b) fertilization.

c) denitrification.

d) the Ostwald process.

e) nitrogenation.

The oxidation state of the sulfur atom in S2O32– is:

a) 0

b) 1

c) 2/3

d) 2

e) 3

Choose the species with the largest bond strength.

a) F2

b) Cl2

c) Br2

d) I2

e) All are the same.

Choose the species with the largest bond strength.

a) F2

b) Cl2

c) Br2

d) I2

e) All are the same.

Choose the species with the smallest hydration energy (absolute value).

a) F–

b) Cl–

c) Br–

d) I–

e) all the same

Phosphoric acid easily undergoes ______reactions.

a) addition

b) substitution

c) polymeric

d) condensation

e) nucleophilic

What Group 6A elements are semiconductors?

a) selenium and polonium

b) tellurium and polonium

c) sulfur and selenium

d) selenium and tellurium

e) sulfur and tellurium

]Nitroglycerin, the main component of dynamite, decomposes very rapidly and exothermically according to the equation:

4 C3H5N3O9(l) à 6 N2(g) + 12 CO2(g) + 10 H2O(g) + O2(g) + energy

What is the total volume of products that would be produced from 550. g of nitroglycerin? Assume the heat released caused the temperature to become 233˚C and the pressure to be 10.0 atm.

a) 2280 L

b) 72.9 L

c) 33.6 L

d) 17.6 L

e) 10.1 L

Which of the following is not a compound?

a) XeF4

b) KrF2

c) ArBr4

d) XeO3

e) At least two of the above are not compounds.

Which of the following titration curves best represents phosphorous acid, H3PO3, being titrated with a strong base?

Which metal ion has a d5 electron configuration?

a) Pd2+

b) Ag+

c) Fe3+

d) Os2+

e) Co2+

A coordination compound of Cu2+ can be described as Cu(NH3)xSO4 and is known to contain 29.9% NH3. The value of x is:

a) 2

b) 3

c) 4

d) 6

e) none of these

Ethylenediamine (en) is a bidentate ligand. What is the coordination number of cobalt in [Co(en)2Cl2]Cl?

a) four

b) five

c) seven

d) eight

e) six

You discover that the complex decomposes in water. You dissolve 0.1000 g of the complex in H2O and add excess NaHg(SCN)4, which precipitates Co(II) as CoHg(SCN)4(s). After the precipitate is washed and dried, its mass is 0.1102 g. How many grams of cobalt are contained in 0.100 g of the complex?

a) 0.1102

b) 0.0396

c) 0.0132

d) 0.437

e) 0.0548

You analyze for pyridine (Kb is approximately 10–9) by dissolving 0.1000 g of complex in 10 mL of H2O and titrating with a 0.01 M HCl solution. Which of the following indicators should be used to detect the endpoint? (Assume that the initial concentration of pyridine is approximately 0.01 M.)

a) bromophenol blue, pH range of color change = 3.0–4.6

b) methyl red, pH range of color change = 4.8–6.0

c) bromothymol blue, pH range of color change = 6.0–7.6

d) thymol blue, pH range of color change = 8.0 –9.6

e) alizarin yellow, pH range of color change = 10.1–12.0

Which of the following ligands might give linkage isomers?

a) NO2–

b) SCN–

c) H2NHC2CH2NH2

d) a and b

e) a, b, and c

Give the number of geometrical isomers for the octahedral compound [MA2B2C2], where A, B, and C represent ligands.

a) 1

b) 2

c) 3

d) 5

e) none of these

The ____ isomer of the complex Ni(en)2Cl2 exhibits optical isomers, but the _____ isomer does not.

a) cis, trans

b) trans, cis

c) Both isomers exhibit optical isomers.

d) Neither isomers exhibit optical isomers.

Which of the transition metals is the best conductor of heat and electric current?

a) copper

b) silver

c) gold

d) tungsten

e) titanium

The reducing abilities of the first-row transition metals generally ______going from left to right across the period.

a) decrease

b) increase

c) stay the same

d) none of these

e) remain at 1.0 V

The reducing abilities of the first-row transition metals generally ______going from left to right across the period.

a) decrease

b) increase

c) stay the same

d) none of these

e) remain at 1.0 V

Which of the following statements concerning the complex ion Co(en)2Cl2+ is true?
(en = ethylenediamine, NH2CH2CH2NH2)?

a) The complex ion contains Co(I).

b) The complex ion exhibits cis and trans geometric isomers, but no optical isomers.

c) The complex ion exhibits two geometric isomers (cis and trans) and two optical isomers.

d) Since en is a strong field ligand (large D), the complex ion is paramagnetic.

e) The geometric isomers of the complex ion have identical chemical properties.

Which of the following is paramagnetic?

a) Zn(H2O)62+

b) Co(NH3)63+ (strong field)

c) Cu(CN)32–

d) Mn(CN)62– (strong field)

e) none of these

Calculate the total number of unpaired electrons in the following complex ions: Zn(OH2)62+, Ni(CN)42– (square planar), Co(NH3)63+ (strong field).

a) 0

b) 1

c) 2

d) 3

e) 4

Which of the following crystal field diagrams is correct for Mn(CN)63– (CN– is a strong field ligand)?

Choose the most likely pattern for the crystal field diagram for the complex trans–[Ni(NH3)2(CN)4]2– where CN– produces a much stronger crystal field than does NH3.

The empirical formula of a compound with a mass percent composition of 6.78% H, 31.43% N, 39.76% Cl, and 22.03% Co is consistent with which of the following complexes?

a) [Co(NH3)3Cl3]

b) [Co(NH3)4Cl2]Cl

c) [Co(NH3)5Cl]Cl2

d) [Co(NH3)6]Cl3

e) none of these

For which of the following metal ions would there be no low-spin versus high-spin distinction in octahedral complexes?

a) Cr2+

b) V2+

c) Fe3+

d) Mn2+

e) Co3+

The spectrochemical series is

I– < Br– < Cl– < F– < OH– < H2O < NH3 < en < NO2– < CN–

Which of the following complexes will absorb visible radiation of the highest energy (shortest wavelength)?

a) [Co(H2O)6]3+

b) [Co(I)6]3–

c) [Co(OH)6]3–

d) [Co(en)3]3+

e) [Co(NH3)6]3+

The strength of steel is due to the effect of what substance with the iron?

a) copper

b) carbon monoxide

c) sulfur

d) carbon

e) zinc

Name the following:

a) isopropane

b) methylpentane

c) methylbutane

d) n-pentane

e) dodecane

Name the following:

a) 2,4-diethylpentane

b) 3,5-dimethylheptane

c) secondary ethylpentane

d) 2,3-dimethyl-2,3-diethylpropane

e) none of these

A student gave a molecule the following name:

2-methyl-4-t-butylpentane

However, the teacher pointed out that, although the molecule could be correctly drawn from this name, the name violates the IUPAC rules. What is the correct (IUPAC) name of the molecule?

a) 2-t-butyl-4-methylpentane

b) 2,2,3,5-tetramethylhexane

c) 2,4,5,5-tetramethylhexane

d) 1-sec-butyl-1,2,2-trimethylpentane

e) none of these (a-d)

Name the following:

a) 1-hexyne

b) 2-ethynyl butane

c) 2-ethyl-3-butyne

d) 3-methyl-1-pentyne

e) 3-methyl-4-pentyne

CH3C º CCH2CH2Cl is named:

a) 1-chloro-3-pentyne

b) 5-chloro-2-pentene

c) 1-acetylenyl-3-chloropropane

d) 5-chloro-2-pentyne

e) 1-chloro-3-pentene

Which of the following compounds can exhibit geometrical isomerism?

How many structural and geometrical isomers are there of chloropropene?

a) 2

b) 3

c) 4

d) 5

e) more than 5

Which of the following types of compounds must have an sp2-hybridized carbon center?

a) ethers

b) ketones

c) alcohols

d) alkanes

e) amines

For which of the following compound(s) are cis and trans isomers possible?

a) 2,3-dimethyl-2-butene

b) 3-methyl-2-pentene

c) 4,4-dimethylcyclohexanol

d) ortho-chlorotoluene

e) All can exhibit cis/trans isomers.

Which of the following has an optical isomer?

e) none of these

Name the following:

a) n-propyl acetate

b) isopropyl formate

c) isopropyl acetate

d) ethyl propanoate

e) none of these

Name the following:

a) acetone

b) butyraldehyde

c) diethylketone

d) diethyl ether

e) none of these

Name the following:

a) 2-chloro-3-ethyl-1-isopropylbutanone

b) isopropyl-chloro,methylbutyl ketone

c) 2-butyl,chloro,isobutanoyl methane

d) 4-chloro-2,5-dimethyl-3-heptanone

e) 3-methyl-4-chloro-1-isopropylpentanone

Which of the following is known as wood alcohol?

a) methanol

b) ethanol

c) propanol

d) isopropanol

e) none of these

Teflon is an example of a

a) copolymer

b) homopolymer

c) dimer

d) two of these

e) none of these

Identify the type of organic compound shown:

a) aldehyde

b) ester

c) amine

d) ketone

e) none of these

Which structure represents an optically active aldehyde?

Which of the following becomes more soluble in water upon addition of NaOH?

a) an amine

b) a carboxylic acid

c) an amine

d) an aromatic hydrocarbon

e) an alkane

When the following organic compound is oxidized, what is the major organic product?

a) 3-pentanoic acid

b) 3-pentanol

c) 3-pentanone

d) 3-pentanal

e) no reaction takes place

Which of the following pairs of substances could form a polyester?

a) H2C=CHCH3 + HOCH2CH2COOH

b) HO(CH2)4COOH + HOCH2CH=CHCH3

c) H2C=CHCN + H2C=CHCH3

d) HOCH2CH2OH + HOOCCOOH

e) H2NCH2COOH + H2NCH2CH2COOH

Consider the polymer drawn below:

What monomer(s) is (are) needed to produce the above polymer?

a) CH2 = CH2 and CH3CH = CH2

b) CH2 = C(CH3)2

c) CH3CH = CHCH3

d) CO and CH2 = CH2

e) none of the above

What organic compounds typically have strong odors?

a) aldehydes

b) alkynes

c) carboxylic acids

d) amines

e) two of these

In condensation polymerization, a common by-product is:

a) ethylene

b) alcohol

c) aldehyde

d) water

Draw the isomers for C4H10.
Which one of the following statements about the structure of proteins is incorrect?

a) Disulfide bonds provide strong intrachain interactions.

b) Hydrogen bonding stabilizes the a-helix proteins.

c) Nonpolar groups tend to face the outside of a protein in an aqueous solution.

d) Ionized amino acid side chains can form salt bridges within a protein.

e) Heat can disrupt tertiary structure.

The structures of proteins are partially determined by the order of various amino acids in the macromolecule. This level of structural determination is known as

a) primary structure.

b) secondary structure.

c) tertiary structure.

d) quaternary structure.

e) order of bases.

Which of the following is the best description of a protein?

a) an alternating chain of amino acids and nucleic acids

b) a chain of amino acids connected by ester bonds

c) two antiparallel chains of nucleic acids connected by hydrogen bonding

d) a chain of amino acids formed by condensation polymerization

e) a chain of nucleotides connected by phosphodiester bonds

Which of the following is not a function of proteins?

a) structure

b) catalysis

c) oxygen transport

d) energy transformation

e) All of these are functions of proteins.

The condensation product of two amino acids is a(n)

a) peptide.

b) ketone.

c) ether.

d) ester.

e) alcohol.

Hydrogen bonding between ¾C=O groups and NH–groups in the backbone of a protein determines the

a) primary structure.

b) secondary structure.

c) tertiary structure.

d) quaternary structure.

e) all of these

The secondary and tertiary structures of most biomolecules are determined by

a) hydrophobic bonding.

b) hydrogen bonding.

c) salt bridges.

d) disulfide bonds.

e) all of these

When heat is added to proteins, the hydrogen bonding in the secondary structure breaks apart. What are the algebraic signs of DH and DS for the denaturation process?

a) Both DH and DS are positive.

b) Both DH and DS are negative.

c) DH is positive and DS is negative.

d) DH is negative and DS is positive.

e) DH is positive and DS is 0.

The process of breaking down the three-dimensional structure of a protein is called

a) degradation.

b) denaturation.

c) decomposition.

d) fission.

e) none of these.

What are the building blocks of proteins?

a) nucleotides

b) glucose and sucrose

c) lipids

d) amino acids

e) esters

The monomers that make up a starch molecule are:

I. optically active

II. not optically active

III. aldehydes

IV. ketones

Which of the following is not a monosaccharide?

a) sucrose

b) glucose

c) fructose

d) galactose

e) All of the above (a-d) are monosaccharides.

Table sugar is a disaccharide formed from

a) alpha-d-glucose and fructose

b) beta-d-glucose and fructose

c) d-galactose and d-ribose

d) d-galactose and fructose

e) none of these

71. Draw and name the missing product below. Draw and name the missing product below.

Draw and name the two possible missing products below.

acid

CH3CH=CH2 + H2O ?

catalyst