Project #79125 - unit 6

A valid Lewis structure of __________ cannot be drawn without the central atom violating the octet rule.

 

NI3

 

SO2

 

SF4

 

SiF4

 

CO2

 

Of the ions below, ONLY __________ has a noble gas electron configuration.

 

S3-

 

O2+

 

I+

 

K-

 

Cl-

 

Of the bonds C-C, C=C, and C≡C, the C-C bond is __________.

 

strongest/shortest

 

strongest/longest

 

weakest/longest

 

weakest/shortest

 

intermediate in both strength and length

 

Lattice energy is __________.

 

the energy required to convert a mole of ionic solid into its constituent ions in the gas phase

 

the energy given off when gaseous ions combine to form one mole of an ionic solid

 

the energy required to produce one mole of an ionic compound from its constituent elements in their standard states

 

the sum of ionization energies of the components in an ionic solid

 

the sum of electron affinities of the components in an ionic solid

 

 

In ionic bond formation, the lattice energy of ions ________ as the magnitude of the ion charges _______ and the radii __________.

 

increases; decrease; increase

 

increases; increase; increase

 

decreases; increase; increase

 

increases; increase; decrease

 

increases; decrease; decrease

 

There are __________ valence electrons in the Lewis structure of HCN.

 

18

 

20

 

10

 

32

 

36

 

Of the possible bonds between carbon atoms (single, double, and triple), __________.

 

a triple bond is longer than a single bond

 

a double bond is stronger than a triple bond

 

a single bond is stronger than a triple bond

 

a double bond is longer than a triple bond

 

a single bond is stronger than a double bond

 

Of the atoms below, __________ is the most electronegative.

 

Si

 

Cl

 

Rb

 

Ca

 

S

 

There are __________ valence electrons in the Lewis structure of PCl3.

 

14

 

12

 

18

 

26

 

10

 

 

Bond enthalpy is __________.

 

always positive

 

always negative

 

sometimes positive, sometimes negative

 

always zero

 

unpredictable

 

Using the Born-Haber cycle, the ΔHf° of KBr is equal to __________.

 

ΔHf°[K (g)] + ΔHf°[Br (g)] + Il(K) + E(Br) + ΔHlattice

 

ΔHf°[K (g)] - ΔHf°[Br (g)] - Il(K) - E(Br) - ΔHlattice

 

ΔHf°[K (g)] - ΔHf°[Br (g)] + Il(K) - E(Br) + ΔHlattice

 

ΔHf°[K (g)] + ΔHf°[Br (g)] - Il - E(Br) +ΔHlattice  

 

ΔHf°[K (g)] + ΔHf°[Br (g)] + Il(K) + E(Br) - ΔHlattice

 

In the Lewis symbol for a sulfur atom, there are __________ paired and __________ unpaired electrons.

 

2; 2

 

4; 2

 

2; 4

 

0; 6

 

5; 1

 

A valid Lewis structure of __________ cannot be drawn without the central atom violating the octet rule.

 

PF5

 

PCl3

 

SO3

 

CCl4

 

CO2

 

Of the molecules below, the bond in __________ is the most polar.

 

HBr

 

HI

 

HCl

 

HF

 

H2

 

When converting from one resonance structure to another, __________.

 

only atoms are moved

 

electrons and atoms are both moved

 

only electrons are moved

 

neither electrons nor atoms can be moved

 

electrons must be added

 

Resonance structures differ by __________.

 

number and placement of electrons

 

number of electrons only

 

placement of atoms only

 

number of atoms only

 

placement of electrons only

 

The central atom in __________ obeys the octet rule.

 

SF4

 

KrF2

 

PCl3

 

XeF4

 

ICl4-

 

Which of the following has the bonds correctly arranged in order of increasing polarity?

 

Be−F, Mg−F, N−F, O−F

 

O−F, N−F, Be−F, Mg−F

 

O−F, Be−F, Mg−F, N−F

 

N−F, Be−F, Mg−F, O−F

 

Mg−F, Be−F, N−F, O−F

 

 

 

As the number of covalent bonds between two atoms increases, the distance between the atoms __________ and the strength of the bond between them __________.

 

increases, increases

 

decreases, decreases

 

increases, decreases

 

decreases, increases

 

is unpredictable

 

In which of the molecules below is the carbon-carbon distance the shortest?

 

H2C=CH2

 

H-C=C-H

 

H3C-CH3

 

H2C=CCH2

 

H3C-CH2-C H3

 

 

Subject Science
Due By (Pacific Time) 08/14/2015 12:00 pm
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