electronic structure
An electron in an atom is known to have an m1 value of -2. What is the smallest possible value of n that this electron can have?
n = 3
Arrange the following ions by their ionic radius from smallest to largest:
Ar, Cl-, Ca2+, S2-, K+
Ca2+, K+,Ar, Cl-, S2-
How many of the following cannot form an octet around each atom? Name them.
ClO2, SO3, BF3, NO2, NH4+, N2
3, ClO2, BF3, NO2
How many sigma and pi bonds are in the following compounds?
a) HCN b) Sulfate ion c) propene
a) 2 sigma, 2 pi b) 4 sigma, 2 pi c) 8 sigma, 1 pi
What is NOT an assumption made in kinetic-molecular theory
a) attractive forces between gas molecules are negligible
b) gas particles are in continuous motion except at low temperatures
c) Collisions between gas molecules do not result in a loss of energy
d) Repulsive forces between gas molecules are negligible
B
1.7 x 105 nm
Write an isoelectronic series with at least four ions, all of which have 10 total electrons
O2-, F-, Ne, Na+, Mg2+
Which of the following molecules are polar?
a) CCl4 b) PBr5 c) O3 d) CO2 e) BrF5 f) NH3
c) O3, e) BrF5 and f) NH3
Which of these are matched with the wrong electron domain geometry?
a) H2S - tetrahedral b) BF3 - trigonal planar c) NF3 - pyramidal d) CCl4 - tetrahedral e) XeF4 - tetrahedral f) PCl5 - trigonal bipyramidal
c) NF3 and e) XF4
a 2.2 mol sample of ammonia gas at a pressure of 1840 mmHg is compressed from a volume of 3.4 L to 2.0 L at a constant temp. What is the pressure (in torr) after compression?
3128 torr
It takes 463. kj/mol to break an O--H bond. Calculate the maximum wavelength (in nm) of light for which a single O-H bond an be broken by absorbing a single photon
258. nm
Rank these elements by their ionization energy from highest to lowest:
Silicon, sulfur, germanium, selenium, argon
argon, sulfur, silicon, selenium, germanium
Draw the resonance structures of the carbonate ion. Determine the formal charge on the carbon atom.
Formal charge of C is 0
Which of these are matched with the wrong molecular geometry?
a) nitrite ion - trigonal planar b) N3- - linear c) BrF5 - square pyramidal d) ClO4 - tetrahedral
a) NO2- bent
If the pressure of 12.5 g of hydrogen gas at 28 oC is 1.5 atm in a 2.8 L balloon, then calculate the temperature at which the pressure is 860 torr when the volume is 2.4 L
-78.4 oC
a viral particle that is moving at a velocity of 296 cm/s has a mass of 9.70 x 10-25 g. What is the matter wavelength for this particle (in mm)?
Bonus: If the particle has a width of 8 nm, should it be described w/ quantum or classical physics
23.1 mm
Bonus answer: classic physics; its size is less than its wavelength
Which of these electrons would be most effective in screening an electron in a 4d orbital? Rank them from most to least effective
a) an electron in a 2p orbital b) an electron in a 2s orbital c) an electron in a 4s orbital d) an electron in a 3d orbital
C, D, A, B
Arrange the following two series from most electronegative atoms to least
a) B, O, C
b) I, Cl, F
a) O, C, B
b) F, Cl, I
which of these do not have sp2 hybridization around their central atoms?
a) sulfite ion b) CF4 c) BF3 d) COCl2 e) a C atom on C2H4 f) BeBr2 g) NH3
f) BeBr2 and g) NH3
what is the temperature (in Celsius) of carbon tetrafluoride gas in a container of 21.3 L if it has a density of 3.32 g/L and is at a pressure of 855 torr?
362. oC
an electron is known to be moving at a velocity of 6.4 x 106 m/s. What is the the smallest possible length (in pm) of box inside of which the atom could be known to be located with certainty?
mass of electron: 9.11 x 10-31 kg
9.0 pm
Zr+(g) + e- --> Zr(g)
This is the reverse reaction of ionization energy. The answer is 1.06 x 10-18 J
Which of the following ionic compounds has the highest lattice energy?
a) NaF b) NaCl c) Na2O d) KCl
Predict the ideal bond angle(s) for the following. Comment on whether these bond angles will be ideal or not
a) F-S-F bonds in SF6 b) C-Cl bonds in COCl2
c) N-O bonds in NO2- d) P-F bonds in PF5 e) P-F bonds in PF3
a) 90o and 180o b) 120o, will be less bc of C=O double bond c) 180o, will be less bc of lone pair on N d) 90o and 120o e) 90o, will be less bc of lone pairs
Use the van der Waals equation to calculate the pressure of 55. g Cl2 gas in a 12.2 L container at a temperature of 338 oC. Then calculate the pressure using
a = 4.567 b = 0.0324 L/mol
a) 2.92 atm b) 2.93 atm