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chem121 > exam 3 questions > Flashcards

exam 3 questions Flashcards

1
Q

the 3p orbitals shell of an atom may contain up to __ electrons.

A

a. 2
b. 4
c. 6
d. 8
e. 10

answer: c

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2
Q

the ground-state electron configuration of phosphorous (P) is?

A

a. [Ne]4s^24p^3
b. 1s^1.2s^2.2s^6.3s^2.3p^6.4s^2.4p^3
c. [Ar]3s^2.3d^10.3p^3
d. [Ne]3s^2.3p^3
e. [Ne]3s^2.3p^4

answer: d

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3
Q

the element that has a valence configuration of 3s^23p^1

A

a. Al
b. B
c. Li
d. Ga
e. Si

correct answer: a

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4
Q

in which set of elements would all members be expected to have the most similar chemical properties

A

a. O,P,F
b. C,N,O
c. K,Ca,Ba
d. Ne, Ar, Kr
e. Na, Ne, Ni

answer: d

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5
Q

atomic radius generally increases moving__

A

a. down a group and from right to left across a period
b. up a group and from left to right across a period
c. down a group and from left to right across a period
d. up a group and from right to left across a period
e. down a group; the period position has no effect

answer: a

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6
Q

in which pair are the two species isoelectronic with each other

A

a. Cl- , Br-
b. Na+ , O2-
c. Ca+ , Na+
d. P2- , Ar
e. F- , Be2+

correct: b

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7
Q

which atom below has the largest radius

A

a. F
b. Cl
c. Mg
d. Na
e. P

answer: d

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8
Q

alkaline earth metals__

A

a. have the largest atomic radius in a given period
b. typically form cations with a 1+ charge
c. form oxides that are typically basic if they dissolve in water
d. form oxides that are typically acidic if they dissolve in water
e. have the largest ionization energy in a given period

answer: c

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9
Q

an element “x” reacts with hydrogen to produce a gas with the formula HX. when dissolved in water, HX forms an acidic solution. X is__

A

a. fluorine
b. calcium
c. oxygen
d. germanium
e. arsenic

answer: a

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10
Q

which of the following pairs are allotropes

A

a. diamond, graphite
b. O2, O3
c. Co, CO2
d. S2, S8
e. a,b,c

answer: e

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11
Q

which of the following correctly represents the first ionization of argon

A

a. Ar(g) -> Ar+ (g) + e-
b. Ar (g) + e- -> Ar- (g)
c. Ar+ (g) -> Ar2+ (g) + e-
d. Ar2+ (g) -> Ar3+ (g) + e-
e. Ar+ (g) + e- -> Ar(g)

answer: a

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12
Q

__ is a unique element and does not truly belong to a single group of the periodic table

A

a. nitrogen
b. radium
c. hyrdrogen
d. uranium
e. helium

correct answer: c

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13
Q

the type of compound that is most likely to contain a covalent bond is

A

a. an ionic compound
b. one that is composed of only nonmetals
c. an alkali metal halide
d. isoelectronic with noble gas
e. an alkaline earth metal oxide

answer: b

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14
Q

in ionic compound formation, the lattice energy __ as the magnitude of the ionic charges __ and the atomic ion radii __

A

a. increases, decreases, increases
b. increases, increases, increases
c. decreases, increases, increases
d. increases, increases, decreases
e. increases, decreases, descrease

answer: d

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15
Q

PCl5 has __ electron domains and a __ molecular arrangement

A

a. 5, square pyramidal
b. 6, tetrahedral
c. 5, trigonal bipyramidal
d. 6, square pyramidal
e. 6, seesaw

answer: c

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16
Q

in which of the molecules below is the carbon-carbon distance is the shortest

A

a H2c=CH2
b. H-C=-C-H
c. H3C-Ch3
d. H2C=C=CH2
e. H3C-CH2-Ch3

answer: b

17
Q

resonance structures differ by

A

a. number and placement of electrons
b. a number of electrons
c. placement of atoms
d. a number of atoms
e. placement of electrons and bonds

correct: e

18
Q

in the lewis structure for ammonia, NH3, the formal charge on nitrogen is

A

a. 7
b. 3
c. 0
d. -3
e. 4

correct answer: c

19
Q

of the following molecules, only __ is polar

A

a. CCl4
b. SF6
c. SO3
d. HCl
e. Cl2

answer d

20
Q

the molecular geometry of the H2O molecule is __ and the molecule is __

A

a. bent, polar
b. bent nonpolar
c. linear, polar
d. linear, nonpolar
e. tetrahedral, nonpolar

answer: a

21
Q

the hybridization of the carbon atom in the SiH4 molecule is __ and the molecular geometry is __

A

a. sp^2 bent
b. sp^3 trigonal pyramidal
c. sp, tetrahedral
d. sp^2 trigonal planar
e. sp^3 tetrahedral

answer: e

22
Q

hybridizing one s atomic orbital and two p atomic orbitals gives rise to __

A

a. one sp hybrid orbital
b. two sp^2 hybrid orbitals
c. three sp^2 hybrid orbitals
d. three sp^3 hybrid orbitals
e. four sp^3 hybrid orbitals

answer: c

23
Q

there are __ sigma bonds and __ pi bonds in the H-C=-C-H molecule

A

a. 3,2
b. 2,3
c. 1,1
d. 5,1
e. 4,2

answer: a

24
Q

for the nitrogen atom in ammonia, NH3, the number of electron domains is __, the hybridization is __ and the molecular geometry is __

A

a. three, sp^2, trigonal planar
b. three, sp^2, trigonal pyramidal
c. four sp^2, trigonal pyramidal
d. four sp^3, trigonal pyramidal
e. four, sp^3, t-shaped

answer: d

25
Q

a typical double bond consists of __

A

a. two pi bonds
b. two sigma bonds
c. one localized bond and one delocalized bond
d. two paired electrons
e. one sigma bond and one pi bond

answer: e

26
Q

a __ covalent bond between the same two atoms is the longest

A

a. single
b. double
c. triple
d. strong
e. they are all the same

answer: a

27
Q

how many equivalent resonance forms can be drawn for CO3^-2 (carbon is the central atom)

A

a. 1
b. 2
c. 3
d. 4
e. 0

answer: c

28
Q

in the molecule below, which atom has the largest partial negative charge
Cl
|
F -C - Br
|
I

A

a. Cl
b. F
c. Br
d. I
e. C

answer: b

29
Q

a valid lewis structure of __ cannot be drawn without violating the octet rule

A

a. NBr3
b. SO2
c. ICl5
d. SiF4
e. CO2

answer: c

30
Q

the molecular geometry of the SH2 molecule is

A

a. linear
b. bent
c. trigonal planar
d. tetrahedral
e. octahedral

answer: b

31
Q

the NO- ion has __ valance electron

A

a. 15
b. 14
c. 11
d. 10
e. 12

answer: e

32
Q

an electron domain consists of:
a) a nonbinding pair of electrons
b) a single bond
c) a multiple bonds

A

a. a only
b. b only
c. c only
d. a,b,c
e. b or c

answer: d

33
Q

according to molecular orbital theory, the bond order of a molecule containing four (4) bonding electrons and two (2) antibonding electrons is

A

a. 0
b. 1
c. 2
d. 4
e. 1/2

answer: b

34
Q

according to molecular orbital theory, the highest energy occupied molecular orbital in the F-F bond of the F2 molecule is __

A

a. pi2s
b. pi2s
c. sigma2s
d. pi*2p
e. pi2p

answer: d

35
Q

according to molecular orbital theory, the bond order of the bond in F2+ ion is __

A

a. 0
b. 1/2
c. 1
d. 3/2
e. 2

answer: d

chem121 (10 decks)

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