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Question 1

how many valence electrons in CS2

Answer 1

16

Question 2

the SF6 molecule

Answer 2

has polar bonds but is non polar

Question 3

a linear triatomic molecule can have ___ lone pairs on central atom

Answer 3

zero, three, or four

Question 4

the lewis structure of NO3- displays

Answer 4

4 bonding pairs and 8 lone pairs

Question 5

the molecule of but-2enoic acid has

Answer 5

11 sigma bonds and 2 pi bonds

Question 6

the four carbon atoms of but-2-enoic acid have the following hybridizations from left to right

Answer 6

sp3, sp2, sp2, sp2

Question 7

in the molecular orbital theory, two atomic orbitals on neighboring atoms can interact if and only if

Answer 7

they have similar energies and non zero overlap

Question 8

what is false

Answer 8

if the temperature increases, the diffusion rate of gas decreases

Question 9

what is the ratio of rates of diffusion of Ne and Ar?

Answer 9

kNe/kAr=sqrt of 2

Question 10

which of the following gases will occupy the largest volume?

Answer 10

2 mol of HCl at 1 bar and 300 K

Question 11

if the strength of the molecular interactions between two molecules of a liquid compound increases

Answer 11

the boiling point of the liquid increases and its vapor pressure decreases

Question 12

what is false about gases?

Answer 12

all gases are colorless and odorless at room temperature

Question 13

the ratio of effusion rates of gaseous argon and dioxygen is?

Answer 13

sqrt: 32/40

Question 14

what is a strong electrolyte

Answer 14

NaCl

Question 15

what is the difference between hybrid orbitals and molecular orbitals?

Answer 15

hybrid orbitals are a mixture of atomic orbitals from a single atom and remain localized on that atom while molecular orbitals are combinations of atomic orbitals that are delocalized over the enitre molecule

Question 16

the molecular orbital description of period 2 diatomic molecules leads to

Answer 16

bond orders and prediction of paramagnetism

Question 17

the dipole moment of a polyatomic molecule

Answer 17

depends on the vector sum of the dipole moments associated with the individual bonds and can be zero even if the molecule contains individual bond dipoles

Question 18

propionic acid has

Answer 18

3 pi bonds and 6 sigma bonds

Question 19

for a molecule with the formula AB3, the molecular shape can be

Answer 19

trigonal planar, trigonal pyramidal, or T-shaped

Question 20

assume you ahve a sample of gas in a cyliner with a movealbe piston, as shown in the diagram, the initial pressure, number of moles, and temp of gas are noted on the diagram. which diagram most closely represents the result of doubling the pressure and number of moles of gas while keeping the temp constant?

Answer 20

look at dots and if the temp rises the bar goes up if it lowers the cools

Question 21

which hybridization scheme allows for the formation of at least one pi bond?

Answer 21

sp and sp2

Question 22

set 1: C(double bond)N or C(triple bond)N
set 2: H(single bond)Cl or H(single bond)Br

which has a lower bond dissociation energy in set 1 and which has a shorter bond in set 2?

Answer 22

C(double)N/H-Cl

Question 23

bond dissociation energies (deltaH)

Answer 23

reactants- products

Question 24

lattice energy

Answer 24

q+q-/r+r- calculate charges and then look at distances; larger charge greater lattice; large ions: small lattice; small ions: large lattice

Question 25

the more effectively two atomic orbitals overlap?

Answer 25

the lower will be the energy of the resulting bonding MO and the higher will be the energy of the resulting antibonding MO

Question 26

what do you do if a question asks about a excited electron?

Answer 26

take it from a bonding orbital and place it in the next highest orbital

Question 27

paramagnetic vs diamagnetic?

Answer 27

paramagnetic is unpaired electrons and diamagnetic is paired electrons

Question 28

bond order

Answer 28

of e- in bonding orbitals and 3 of e- in antibonding orbitals/ 2

Question 29

higher bond order

Answer 29

more strength

Question 30

the hybridization of carbon atoms in acetonitrile

Answer 30

carbon 1: sp3 carbon 2: sp

Question 31

heat is added to boiling water. which are true?

Answer 31

the temp of the water does not change, the knetic energy of some of the water molecules increases, an increased number of water molecules escape into gas phase

Question 32

a linear molecular geometry can be obtained when the electron domain geometry is

Answer 32

octahedral, trigonal bipyramidal, or linear

Question 33

a gaseous mixtrue contains 0.18 mols of Ch3cl, 0.57 moles of ch4, and 0.71 moles of c2h4. the total pressure is 1.2 atmospheres. what is the partial pressure of ch4?

Answer 33

0.47 atm

Question 34

under which conditions is carbon monoxide expected to deviate most from ideality?

Answer 34

low temperature and high pressure

Question 35

in a typical multiple bond, the sigma bond results from a overlap of ___ orbitals and the pi bonds result from overlap of ____ orbitals

Answer 35

hybrid, atomic

Question 36

in ionic bond formation, the lattice energy of ions ___ as the magnitude of the ion charges ____ and the radii _____?

Answer 36

increases, increases, decreases

Question 37

the volume of a sample of gas (2.49g) was 752mL at 1.98 atm and 62 C. The gas is?

Answer 37

PV=nRT and get the moles and then divide the mass by the moles and then compare the molar masses

Question 38

in the mountains, water in an open container will boil when?

Answer 38

its vapor pressure is equal to the atmospheric pressure

Question 39

the ability of a molecule with an electrostatic charge to distort another molecule's charge distribution is known as?

Answer 39

polarizability

Question 40

at what point will molecules condense?

Answer 40

when the attractive forces exceed the kinetic energy of the molecules

Question 41

highest density at STP?

Answer 41

the line with the shortest distance

Question 42

what explains the compressibility of a gas?

Answer 42

the volume of the particles is negligible compared to the volume of the gas

Question 43

what will behave least like an ideal gas at low temps?

Answer 43

SO2

Question 44

what do you do if they give you a density?

Answer 44

MM=dRT/P; d=mp/RT

Question 45

how to figure out highest boiling point?

Answer 45

look to see if it is polar or not

Question 46

on a hot summer day, you notice that a bag of chips left in your vehicle has inflated. why did this happen?

Answer 46

as temp increases, gas molecules gain kinetic energy and the volume of the gas increases inside the bag of chips

Question 47

according to mo theory, the overlap of two 1s orbitals produces

Answer 47

two sigma orbitals: one bonding and one antibonding

Question 48

the reason we need mo theories is because?

Answer 48

valence theory and lewis structures fall short in describing how electrons are distributed in molecular bonds, it allows determination of whether a molecule is diamagnetic or paramagnetic, it allows determination of bond order

Question 49

what is false about densities of gases?

Answer 49

are much larger than that of corresponding liquids

Question 50

1 bar=

Answer 50

0.987 atm