Useful Equations
If you have 100torr, how many mmHg do you have
100mmHg
Which pair of solutes would have high solubility in water and why?
CH3OH and KCl
CH3OH and Mg3(PO3)2
C6H14 and KCl
C6H14 and Mg3(PO3)2
CH3OH and KCl
What is a valance bond
A band of orbitals filled or partially filled by
valence electrons
What is the mass percentage of H in a molecule of propanol, C3H7OH
13.3%
Define the boiling point mathematically
The point at which temperature is equal to 1atm or 760mmHg (torr)
What is the edge length of a body-centered cubic lattice structure
(2r+) + (2r-) = edge length
Given 2 compounds: A and B. A has a molecular mass of 100g, B has a molecular mass of 200g. Which compound likely has the higher freezing point?
Compound B
Name the three possible hole possibilities in interstitial alloys and ionic compounds
Cubic, tetrahedral, and octahedral
Give the balanced combustion reaction of benzene (C6H6)
2C6H6 + 15O2 = 12CO2 + 6H2O
Define the supercritical temperature
Give the equation for percent yield
(Actual yield)/(Theoretical yield)*100
Consider the compounds: CH3-CH2-CH2-CH2-CH3, CH3-CH2-OH, and CH3-CH2-CH3. Which of these likely has the lowest boiling point and WHY?
CH3-CH2-CH3 because it is the smallest compound without a hydrogen bond.
The band gap in a solid material is the energy difference between the valance band and the conductance band; in a solid known to be a semiconductor, the band gap is:
Very small
Given the balanced combustion equation:
CH4 + 2O2 = CO2 + 2H2O
if 24.0g of methane is combusted what is the theoretical yield of H20
54.04g
Given the following compounds: sucrose, graphite, sodium chloride, and dihydrogen monoxide, identify the covalent network solid
graphite
Given the linear regression equation, based on the vapor pressure of a volatile liquid at different temperatures: lnP = (-change in Hvap/R)*(1/T)+C
Identify the slope, x, and y variables
y=mx+b
(change in Hvap/R) = m (slope)
y=lnP
x=(1/T)
Given the linear regression equation, based on the vapor pressure of a volatile liquid at different temperatures: lnP = (-change in Hvap/R)*(1/T)+C
y=-5397.9x+15.249
Identify the boiling point
354K
The x-ray diffractogram of an ionic solid produces a very intense feature at 2(theta)=41.21degrees. If the wavelength of the x-ray source is 193.6pm, what is the edge distance for the unit cell
275pm
A compound has a mass composition of 40.45% carbon, 7.92% hydrogen, 35.91% oxygen, and 15.72% nitrogen, identify the empirical formula for this compound
C3H7O2N
What does mol mean?
It is a quantity representing 6.022*10^23
Given the linear regression equation, based on the vapor pressure of a volatile liquid at different temperatures: lnP = (-change in Hvap/R)*(1/T)+C rewrite the equation to solve for T
T=1/((lnP-c)/(-change in Hvap/R))
or
T=(-change in Hvap)/((lnP-C)*R)
Given the linear regression equation, based on the vapor pressure of a volatile liquid at different temperatures: lnP = (-change in Hvap/R)*(1/T)+C
y=-5397.9x+15.249
Identify the heat of vaporation
44.9KJ/mol
The ionic compound potassium bromide has the same lattice structure as sodium chloride. Given the radius of a potassium ion is 138pm and the radius of a bromide ion is 195pm, what is the volume of the lattice unit cell in cubic cm.
2.95*10^(-22)cm^3
1.) Balance the equation
2.) if 0.60mol ZnCl2 is reacted with 0.50mol Al, identify the limiting reactant and give the theoretical yield in moles
TY = 0.4mol AlCl3
What is Dr. Columbia's favorite snack?
Peanut butter