Computer Midterm 3 Review

Question 1

What is M in root mean square velocity? And does it depend on anything?

Answer 1

M is the molar mass of the substance, it doesn’t depend on the actual quantity, just need molar mass.

Question 2

q>0
____thermic
heat on __________ side

Answer 2

endothermic

heat on reactants side

Question 3

q

Answer 3

exothermic

heat on products side

Question 4

w>0, _______ doing work on _______

_________ of volume

Answer 4

surroundings doing work on system

decrease of volume

Question 5

w

Answer 5

system doing work on surroundings

expansion of volume

Question 6

When counting sigma bonds, each single/double/triple bond counts as ______ bond.

Answer 6

one.

Question 7

_____ pi bond per double bond.

Answer 7

one.

Question 8

If a question says, “calculate the amount of heat released when 63.18 grams of methanol are burned in oxygen to this reaction etc.” how do you set that up?

Answer 8

of moles of substance/molar ratio in equation=x/H reaction given.

Question 9

Simple Cubic Structure
# of atoms:
coordination #:

Answer 9

1, 6

Question 10

Face Centered Cubic Structure
# of atoms:
coordination #:

Answer 10

4, 12

Question 11

Body Centered Cubic Structure
# of atoms:
coordination #:

Answer 11

2, 8

Question 12

Unit Cells

If it’s on the corner, multiply amount by

Answer 12

1/8

Question 13

Unit Cells

If it’s on a face, multiply amount by

Answer 13

1/2

Question 14

Unit Cells

If it’s in the center, multiply amount by

Answer 14

1

Question 15

What is the first postulate of the Kinetic Molecular Theory?

Answer 15

1. The particles are so small compared with the distances between them that the volume of the individual particles can be assumed to be negligible (zero).

Question 16

What is the second postulate of the Kinetic Molecular Theory?

Answer 16

2. The particles are in constant motion. The collisions of the particles with the walls of the container are the cause of the pressure exerted by the gas.

Question 17

What is the third postulate of the Kinetic Molecular Theory?

Answer 17

3. The particles are assumed to exert no forces on each other; they are assumed neither to attract nor to repel each other.

Question 18

What is the fourth postulate of the Kinetic Molecular Theory?

Answer 18

4. The average kinetic energy of a collection of gas particles is assumed to be directly proportional to the Kelvin temperature of the gas.

Question 19

The attractive forces between the molecules of a gas become significant only at _____ temperatures.

Answer 19

low

Question 20

How to rank by boiling point:

Answer 20

stronger IMF = greater boiling point

Question 21

Unit Cells

If it’s on the side edge, multiply amount by

Answer 21

1/4

Question 22

On phase change diagram for flat lines, heat flow is represented by

Answer 22

q=m∆Hfusion

Question 23

On phase change digram for slanted lines, heat flow is represented by

Answer 23

q=mc∆T

Question 24

/ on heating diagram equation

Answer 24

mc∆T

Question 25

_ on heating diagram equation

Answer 25

m∆Hfusion/vaporization

Question 26

According to Charles Law, if temp (in K) of an ideal gas sample is doubled while other conditions stay the same, the volume of the sample is ________.

Answer 26

doubled.

Question 27

Greater the charge, the ________ the melting point.

Answer 27

greater

Question 28

Greater the size, the ________ the melting point.

Answer 28

smaller

Question 29

How many and what equation for going from solid to melting point

Answer 29

Just the first /, one equation

Question 30

How many and what equation for melt

Answer 30

Just the first _, one equation

Question 31

Why would a metal pot be hotter than a metal pot w/ water?

Answer 31

Metal pot has lower specific heat.

Question 32

It’s only a hydrogen bond when it’s bonded with ________.

Answer 32

Something highly electronegative (almost always, N,O,F)

Question 33

London Dispersion only happen with

Answer 33

Nonpolar molecules.

Question 34

Greater the charge = _________ melting point.

Answer 34

Greater

Question 35

Smaller Ions = ____________ melting point.

Answer 35

greater

Question 36

Amount of heat required, if it says to a _____ (ex. boiling) point, use equation:

Answer 36

q=mc∆T

Question 37

Amount of heat required, if it says just one action (ex. melts), use equation:

Answer 37

q=m∆H

Question 38

With root mean square velocity, molar mass is in _____

Answer 38

KILOGRAMS