Computer Midterm 3 Review Flashcards
What is M in root mean square velocity? And does it depend on anything?
M is the molar mass of the substance, it doesn’t depend on the actual quantity, just need molar mass.
q>0
____thermic
heat on __________ side
endothermic
heat on reactants side
q
exothermic
heat on products side
w>0, _______ doing work on _______
_________ of volume
surroundings doing work on system
decrease of volume
w
system doing work on surroundings
expansion of volume
When counting sigma bonds, each single/double/triple bond counts as ______ bond.
one.
_____ pi bond per double bond.
one.
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?
of moles of substance/molar ratio in equation=x/H reaction given.
Simple Cubic Structure
# of atoms:
coordination #:
1, 6
Face Centered Cubic Structure
# of atoms:
coordination #:
4, 12
Body Centered Cubic Structure
# of atoms:
coordination #:
2, 8
Unit Cells
If it’s on the corner, multiply amount by
1/8
Unit Cells
If it’s on a face, multiply amount by
1/2
Unit Cells
If it’s in the center, multiply amount by
1
What is the first postulate of the Kinetic Molecular Theory?
- 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).
What is the second postulate of the Kinetic Molecular Theory?
- 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.
What is the third postulate of the Kinetic Molecular Theory?
- The particles are assumed to exert no forces on each other; they are assumed neither to attract nor to repel each other.
What is the fourth postulate of the Kinetic Molecular Theory?
- The average kinetic energy of a collection of gas particles is assumed to be directly proportional to the Kelvin temperature of the gas.
The attractive forces between the molecules of a gas become significant only at _____ temperatures.
low
How to rank by boiling point:
stronger IMF = greater boiling point
Unit Cells
If it’s on the side edge, multiply amount by
1/4
On phase change diagram for flat lines, heat flow is represented by
q=m∆Hfusion
On phase change digram for slanted lines, heat flow is represented by
q=mc∆T
/ on heating diagram equation
mc∆T
_ on heating diagram equation
m∆Hfusion/vaporization
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 ________.
doubled.
Greater the charge, the ________ the melting point.
greater
Greater the size, the ________ the melting point.
smaller
How many and what equation for going from solid to melting point
Just the first /, one equation
How many and what equation for melt
Just the first _, one equation
Why would a metal pot be hotter than a metal pot w/ water?
Metal pot has lower specific heat.
It’s only a hydrogen bond when it’s bonded with ________.
Something highly electronegative (almost always, N,O,F)
London Dispersion only happen with
Nonpolar molecules.
Greater the charge = _________ melting point.
Greater
Smaller Ions = ____________ melting point.
greater
Amount of heat required, if it says to a _____ (ex. boiling) point, use equation:
q=mc∆T
Amount of heat required, if it says just one action (ex. melts), use equation:
q=m∆H
With root mean square velocity, molar mass is in _____
KILOGRAMS
