Orbitals/Nodes
What are the possible values of "l" and "ml" if n=4?
l = 0, 1, 2, 3
ml = -3, -2, -1, 0, 1, 2, 3
Draw the Lewis structure for PH3 Then determine the bond angle on the central atom and its hybridization.
Bond angle = 107o
Hybridization = sp3
What element is defined by the following electron configuration?
1s22s22p63s23p64s23d104p65s24d3
Niobium (Nb)
Calculate the kinetic energy in joules of a water balloon that weighs 121 grams and is thrown with a speed of 10.2 m/s.
6.29 J
If the enthalpy of a reaction is positive, what type of reaction is taking place?
Endothermic reaction
What are the possible orbitals for n=3?
s, p, d
Draw the Lewis structure for SO2 Then determine the molecular geometry and bond angle on the central atom.
m.g. = Bent
Bond angle = 117.5o
Calculate the frequency of a photon with a wavelength of 735 nm.
4.08 x 1014 Hz
A man is outside doing yardwork, he uses 7.60 kJ of energy to push his lawnmower and gains 122 J from the heat of the sun. What is the change of internal energy of the man as he mows his lawn?
Change in energy = -7.48 kJ
The man lost 7.48 kJ of energy.
If the ΔH of condensation is -3.09 kJ/mol and the ΔH of deposition is -3.75 kJ/mol, what is the ΔH of freezing?
-0.660 kJ/mol
Draw the shape of a 5s orbital including all nodes and charges.
Drawing 1
Draw the Lewis structure for AsO43- Then determine the electron geometry and hybridization for this structure.
e.g. = Tetrahedral
Hybridization = sp3
What is the short-hand electron configuration for Xeon (Xe)?
[Kr]5s24d105p6
Calculate the work energy (in Joules) needed to expand a balloon from a volume of 0.200 L to 1.53 L if the external pressure is 0.897 atm. Note, 101.3 J = 1 L.atm
Work energy = -121 J
We used 121 J of energy to inflate the balloon
If the ΔH of a reaction between hydrochloric acid and sodium hydroxide is -12.3 kJ/mol, how much heat is released by reacting 16.4 g of sodium hydroxide with excess hydrochloric acid?
5.04 kJ of heat is released from the reaction
Draw the shape of a 4p orbital including all nodes and charges.
Drawing 2
Draw the Lewis structure for IF4+ Then determine the electron and molecular geometry for this structure.
e.g. = Trigonal Bipyramidal
m.g. = See-saw
Calculate the wavelength (in nanometers) of a photon with an energy of 3.15 x 10-19 J.
631 nanometers
A 0.965 kg zinc rod absorbs 7.86 kJ of heat after being warmed to a temperature of 70.9 oC If the specific heat capacity of zinc is 0.377 J/goC what is the initial temperature of the rod?
Initial temperature = 49.3 oC
For a certain chemical reaction conducted at a constant pressure of 680 torr, 6.75 kJ of heat is released, which causes the container to expand from 1.00 L to 2.08 L. Calculate the ΔH and ΔE. Note 101.3 J = 1 atm.L
ΔH = -6.75 kJ/mol
ΔE = -6.85 kJ
Draw the shape of a 4d orbital. Then draw the radial distribution graph of a 4d orbital.
Drawing 3
Draw the Lewis structure for XeCl4 Then determine the molecular geometry and hybridization for this structure.
m.g. = square planar
hybridization = sp3d2
What is the full electron configuration for Chromium (Cr)?
How many valence electrons does it have?
How many core electrons does it have?
1s22s22p63s23p64s13d5
Valence electrons = 6
Core electrons = 18
A 23.7 g cube of tungsten with an initial temperature of 35.8 oC was dropped into a container filled with 246 g of water with a temperature of 7.12 oC The specific heat capacity of water is 4.184 J/goC and the specific heat capacity of tungsten is 0.134 J/goC. What is the final temperature of both substances at thermal equilibrium?
Final temperature = 7.21 oC
20.8 g of chloric acid are dissolved in 100. g of water and raises the temperature from 15.8 oC to 43.4 oC. If the specific heat capacity of this solution is 4.16 J/goC, what is the ΔH of the reaction? (The reaction is under constant pressure)
ΔH = -56.3 kJ/mol