Chem 3: Quiz 3—Fall 2014
Name:_____________________________________ Points: _____ / 50
Please read each question carefully. Show your work, and partial credit will be awarded where possible.
1.
MARK ALL THAT APPLY: How do the two electromagnetic waves to the
right differ?
A. They have different wavelengths.
B. They have different frequencies.
C. They have different amplitudes.
D. None of the above.
2.
A wave of ultraviolet electromagnetic radiation has a wavelength of 200.0 nm. What is the frequency of this form of light in
petahertz (PHz)?
Hints:
• the speed of light = c = 2.9979 x 108 m/s
• c = λ·ν
• 1 petahertz (PHz)= 1 x 1015 Hz
3.
Write the electron configuration for calcium (Ca):_________________________________
4.
How many valence electrons does a neutral Selenium (Se) atom have?_________________
5.
How many electrons should be included in the Lewis dot structure of the phosphate anion, PO43-?________________
6.
How many electrons would be included in the Lewis dot structure for the cation, N(CH3)4+?_________________
5.
MARK ALL THAT APPLY: Which Lewis dot structures below are NOT reasonable?
A.
B.
C.
D.
6.
Draw the Lewis dot structure for the polyatomic ion arsenite, AsO33-.
7.
Draw the Lewis dot structure for the molecule: CH3CCCH3
E.
8.
9.
What type of orbital is shown to the right?
A. s orbital
B. p orbital
C. d orbital
D. f orbital
E. g orbital
Continued from question 8 above: Given this orbital, what is the corresponding
numerical value for ℓ, the second quantum number?
10. Consider the Lewis dot structure for selenium dioxide below.
A. Based on this structure, what is the ELECTRON geometry at the central
selenium atom?
B.
What is the MOLECULAR geometry at the central selenium atom?
C.
What is the approximate O—Se—O bond angle?