Thermo
What are standard conditions?
25 oC, 1 atm, 1 Molar
What is the equation corresponding to the fourth ionization energy of Selenium? Include states.
Se3+(g) -> Se4+(g) + e-
What intermolecular forces are present in water?
LDFs, Dipole dipole (in the form of hydrogen bonding)
A nice looking dog (winner has best looking dog in 30 seconds)
Judging time...
What 80s movie has the protagonist John McClain?
Die Hard
It is a closed/isolated system.
A unknown element has the following ionization energies:
I1 = 896 kJ/mol
I2 = 1752 kJ/mol
I3 = 14,807 kJ/mol
I4 = 17,948 kJ/mol
What group does this element belong to?
Alkaline Earth Metals (group 2)
Rank the intermolecular forces. Can one have a greater magnitude than another collectively?
LDF < D.D < H.B < Metallic bond, covalent bond, ionic
Yes, for example LDFs can collectively have a greater magnitude than dipole-dipole interactions, for example.
The Lewis dot structure of Benzene (C6H6)
Shown on the board
What do we not include in equilibrium expressions?
Solids and liquids
What is the expected sign of S for the following:
2N2 + 3H2 -> 2NH3
What does the equation E = hv describe?
The energy of a singular photon
What are the trends in the four colligative properties?
Decrease in vapor pressure (reduction)
Freezing point depression
Boiling Point Elevation
Osmotic pressure increase
The molecular geometry of a five coordinate complex containing two lone pairs. What are the bond angles & the name of the geometry?
T shape, 90 degrees. (between lone pairs & one bond is 120).
What buffer system is present in our blood?
Bicarbonate/carbonic acid
What is the difference between a value with a knot (eg. ΔGo) versus the value without a knot (eg. ΔG)? What about when there is an f subscript (eg. ΔGf)? Does O2 have a Hf?
What is the hybridization and molecular geometry of XeF2?
sp3d, linear
A sample of dry nitrogen gas weighing 109.0 g is bubbled through liquid water at 25.0°C. The gaseous mixture of nitrogen and water vapor escapes at a total pressure of 700. torr. What mass of water has vaporized? (The vapor pressure of water at 25°C is 23.8 torr.)
2.47 grams H2O
The possible dot structures of XeF2Cl2
On the board
Which Chemist is famous for her work with radioactive elements, including Radium? She's also the winner of two nobel prizes.
Marie Curie
When 1.20 L of 2.00 M NaSO4 solution at 30.2°C is added to 1.80 L of 0.700 M Ba(NO3)2 solution at 30.2°C in a calorimeter, a white solid (BaSO4) forms. The temperature of the mixture increases to 41.4°C. Assuming that the specific heat capacity of the solution is 6.37 J/°C·g and that the density of the final solution is 2.00 g/mL, calculate the enthalpy change per mole of BaSO4 formed.
-340 kJ/mol
What is the difference between Rh and R?
Description using the difference between wavelength and energy.
Diethyl ether (CH3CH2OCH2CH3) was one of the first chemicals used as an anesthetic. At 34.6°C, diethyl ether has a vapor pressure of 760. torr, and at 18.6°C, it has a vapor pressure of 415 torr. What is the ΔH of vaporization for diethyl ether?
28.3 kJ/mol (use the Claisus Claperyon Equation)
MO diagram of a diatomic nitrogen (N2). Bonus point - what is the bond order?
B.O is 3
What is the least radioactive element on the periodic table? Hint: it's also present in pepto bismal.
Bismuth