Download Chapter 7 Key

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Industrial radiography wikipedia, lookup

Old quantum theory wikipedia, lookup

Photon polarization wikipedia, lookup

Transcript
CHM 111
Chapter 7 Worksheet: The Quantum mechanical model of an atom
Name: _________________________________
Q1.
The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of 589 nm.
(A) What is the frequency of the radiation?
5.09 × 1014 1/s
(B) What is the energy of a photon of this light?
3.37 × 10-19 J
(C) What is the energy of 1.00 mole of photons of this frequency?
203000 J or 203 kJ
Q2.
Arrange the following regions of the electromagnetic spectrum in order of increasing frequency
Microwave, X Rays, Ultraviolet, Visible, Gamma rays
Microwave, Visible, Ultraviolet, X rays, Gamma rays
Q3.
What does it mean when we say that light is quantized?
It exists as a bunch of photons, or individual packets of light. One photon is the smallest amount of light you
can have, and you can’t divide it any further. Light is always a whole number, or quantity, of photons, and fractions are
impossible, so light is “quantized”. (This isn’t quite the normal definition of “quantity”, but no one could come up with a better
word for this idea, so we’re stuck with “quantized”. This is also where the word “quantum” comes from.)
Q4.
What is the difference between a line spectrum and a continuous spectrum?
A continuous spectrum has light of essentially every color and wavelength, without any gaps (put through a
prism, it looks like a full rainbow). A line spectrum contains only a handful of very specific colors or wavelengths, and every
other color is missing; it’s mostly gaps (put through a prism, you might see a narrow slice of blue, a narrow slice of green, and a
couple narrow slices of red, and all the other colors are missing).
Q5.
Give the maximum number of orbitals in an atom that can have these quantum numbers:
(A) n = 3
_____9________
(B) n = 3, l = 1
_____3________
(C) n=2, l=1, ml= 0
_____1_________
(D) n=0, l=0, ml=0
_____0_________
Q6.
Removing the electron from a Hydrogen atom corresponds to a raising the electron from n=1 to an orbit that has n=∞.
What is the energy needed to remove the electron from a hydrogen atom?
2.18 × 10-18 J
What is the energy in terms of kJ per mole?
1310 kJ/mol or 1.31 × 103 kJ/mol
Q7.
The light from a Helium-Neon laser (used to define a meter) has a wavelength of 632.99139822 nm
Calculate the frequency of this laser beam.
4.736 × 1014 1/s
What is the energy of one mole of this radiation?
1.89 × 105 J or 189 kJ
Q8.
Calculate the velocity of an electron that has a de Broglie wavelength of 0.0897 nm.
Mass of an electron = 9.11  10-28 g
8.11 × 106 m/s
Q9.
Circle the sets of quantum numbers that can specify an orbital.
a) n = 3, l = 3, ml = 0
b) n = 1, l = 0, ml = 0
c) n = 5, l = 4, ml = -4
d) n = 2, l = 2, ml = -2
Q10.
One photon of a particular radiation has energy of 6.22  10-19 J.
a) Calculate the frequency of this radiation.
9.39 × 1014 1/s
b) What is the wavelength of this radiation in nm?
320 nm
Q11.
Consider the transition from n = 1 to n = 5 in the Hydrogen atom.
a) Is energy absorbed or emitted in this transition?
absorbed
b) Calculate the energy of the photon that corresponds to this transition.
2.09 × 10−18 J
c)
Calculate the wavelength that corresponds to this transition.
9.49 × 10−8 m or 94.9 nm
Q12.
Circle each of the following orbitals that are real (can exist).
a) 2d
b) 3f
c) 1s
d) 3d
e) 6p
Q13.
The brightest light emitted by the sun has a wavelength of about 0.48 µm.
Calculate the frequency of this radiation.
6.2 × 1014 1/s
What is the energy of one photon of this radiation?
4.14 × 10−19 J
Q14.
Q15.
What is the maximum number of orbitals that are specified by each set of quantum numbers?
a) n=3, l=2, ml = -2
1
b) n=1, l=0
1
c) n=5
25
d) n=2, l=2
0
e) n=5, l=3
7
f) n = 2
4
Arrange the following colors of the visible light in order of increasing wavelength.
Orange, Blue, Green, Violet, Yellow, Red
Violet, Blue, Green, Yellow, Orange, Red
Q16.
An object weighing 0.100 g is travelling at a speed of 45.0 m/s. What is the deBroglie wavelength of this object?
1.47 × 10−31 m