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CHEM 261 > True or False > Flashcards

True or False Flashcards

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1
Q

steric effect is mutual repulsion of atoms having inert gas configuration of electrons

A

T

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2
Q

A lewis acid accepts a pair of electrons

A

T

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3
Q

changing all of the stereogenic centers in a chiral molecule will give a diastereomer

A

F (it gives an enantiomer)

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4
Q

meso compounds have no enantiomer

A

T

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5
Q

the atomic number of beryllium is 5

A

F (it’s 4)

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6
Q

resonance forms are structures of rapidly interconverting molecules

A

F (definition of tautomers) resonance: diff drawings of the same molecule made by moving electrons but not atoms

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7
Q

a chiral reagent or method is always required to recognize enantiomers

A

T

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8
Q

a 60:40 mixture of enantiomers has an optical purity of 60%

A

F (it’s 20%)

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9
Q

the density of substances which float on water is usually greater than 1.0

A

F (substances that float on water has a density less than 1.0)

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10
Q

intermolecular attraction of alkane molecules is due to London forces

A

T

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11
Q

deltaG is positive for an exothermic reaction

A

F (it is negative)

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12
Q

hydroxide anion is less basic than amide anion

A

T

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13
Q

About 150-200 kcal/mole of energy are available at room temperature

A

F (15-20 kcal/mole of energy)

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14
Q

the net dipole of chloroform is aligned with a carbon-chlorine bond

A

F (idk man)

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15
Q

a completely pure organic compound may have different physical properties depending on whether it was made by chemists or isolated from nature

A

F

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16
Q

bronsted-lowry acids donate a proton

A

T

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17
Q

a radical intermediate in a reaction is a transition state

A

F

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18
Q

the pKa of water is about 7

A

F (pKa = ~16, pH = 7)

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19
Q

the structure of a molecule determines all of its physical and biological properties

A

T

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20
Q

overlap of two sp orbitals in a triple bond generates a pi molecular orbital

A

F (overlap of p atomic orbitals with s component fives pi molecular orbital)

21
Q

enthalpy is negative for an exothermic reaction

A

T

22
Q

chloroform has a density r > 1.0

A

T

23
Q

elemental iodine reacts slowly with alkanes to give alkyl halides

A

F (iodine does not react)

24
Q

the net dipole of methane is 0

A

T

25
Q

the energy available to molecules at room temp is about 15-20kcal/mol

A

T

26
Q

all lewis acids accept a pair of electrons

A

T

27
Q

compounds containing more than 65% halogen usually have density r > 1.0

A

T

28
Q

the net dipole of carbon tetrachloride is 0

A

T

29
Q

overlap of two sp orbitals in a triple bonds generates a sigma molecular orbital

A

T

30
Q

the energy needed to break a carbon-hydrogen bond is about 100 kcal/mole

A

T

31
Q

all lewis acids are also bronsted lowry acids

A

F (all bronsted lowry acids are lewis acids)

32
Q

the atomic number of an atom is the total mass of neutrons and protons in the nucleus

A

F (definition describes atomic weight) atomic number: number of protons in the nucleus of an atom

33
Q

the net dipole of chloroform is not aligned with any carbon-chlorine bond

A

T

34
Q

all bronsted lowry acids are also lewis acids

A

T

35
Q

a lewis acid is a nucleophile

A

F (lewis acid accepts electron)

36
Q

changing all of the chiral centers in a chiral molecule will give an enantiomer

A

T

37
Q

a meso compound is achiral

A

T

38
Q

a 80:20 mixture of enantiomers has an optical purity of 60%

A

T

39
Q

a 80:20 mixture of enantiomers has an enantiomeric excess of 60%

A

T

40
Q

the Sn2 reaction has a carbocation intermediate

A

F (no intermediates, Sn1 has a carbocation intermediate)

41
Q

the density of substances that float on water is usually less than 1.0

A

T

42
Q

resonance forms are not rapidly interconverting molecules

A

T

43
Q

bronsted lowry acids donate a proton

A

T

44
Q

cis-1,2- dichlorocyclopropane and trans-1,2-dichloropropane are diastereomers

A

T

45
Q

tautomers are structural isomers with respect to each other

A

T (Tautomers are rapidly interconverting structural isomers)

46
Q

the atomic number of an atom is the total number of protons and nucleus in the nucleus

A

F ( atomic number: number of protons in the nucleus of an atom)

47
Q

the E1 reaction has a carbocation intermediate

A

T

48
Q

the Zaitsev rule favors formation of more highly substituted double bonds

A

T

49
Q

oxidation is always defines as the process of adding oxygen atoms

A

F (oxidation: lose electrons)

CHEM 261 (1 decks)

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