KEY Unit 7 Review - L

1. Below, list ALL of the types of waves in the ELECTROMAGNETIC SPECTRUM in order from the the longest wavelength to the shortest. Under visible light, list the color spectrum. ALSO, label which side of the spectrum has the lowest and highest frequency waves AND lowest and highest energy waves.

Longest λ Shortest λ

__Radio__ _Microwaves _ _Infrared_ _Visible Light_ Ultraviolet _X-rays_ _Gamma_

__RED__ _ORANGE_ _YELLOW_ _GREEN_ _BLUE_ _INDIGO_ _VIOLET_

In reference to the electromagnetic spectrum, describe the relationship between the following variables:

2. frequency and wavelength: INVERSE

3. frequency and energy: DIRECT

4. energy and wavelength: INVERSE

5. How does changing the energy of a light wave affect the speed of the wave?

Changing the energy has NO effect on the speed of the wave.

6. Write the symbol and value for the speed of light.

c = 3.00 x 108 m/s

7. Determine the wavelength of infrared radiation with a frequency of 2.0 x 10 -13 Hz.

(SHOW FORMULA, SUBSTITUTION, AND ANSWER WITH A REASONABLE NUMBER OF SIG DIGS AND UNITS)

(3.00 x 108 m/s) = (2.0 x 10-13 Hz)(X) solve for X X = 1.5 x 1021 m

8. Find the frequency of a wave that has a wavelength of 3.25 x 103 m.

(SHOW FORMULA, SUBSTITUTION, AND ANSWER WITH A REASONABLE NUMBER OF SIG DIGS AND UNITS)

(3.00 x 108 m/s) = (X)(3.25 x 103 m) solve for X X = 9.23 x 104 Hz or 92,300 Hz

9. Calculate the energy of a photon of radiation with a frequency of 8.5 x 1014 Hz. Show all work.

(SHOW FORMULA, SUBSTITUTION, AND ANSWER WITH A REASONABLE NUMBER OF SIG DIGS AND UNITS

E = hf X = (6.63 x 10-34 J/s)(8.5 x 1014 Hz) X = 5.6 x 10-19 J

10. In each set of waves circle the wave with the greatest energy.

(a) Radio waves, X-rays, infrared light

(b) Yellow light, red light, blue light

11. In each set of waves, circle the wave with the greatest frequency.

(a) Microwaves, gamma rays, ultraviolet light

(b) Green light, orange light, violet light

12. In each set of waves, circle the wave with the shortest wavelength.

(a) Infrared light, gamma rays, visible light

(b) Violet light, green light, red light

13. Which rule for electron configuration is violated in the orbital filling diagram shown? Hund’s rule__

___

1s 2s 2p

Circle and explain what is incorrect. every orbital in a sublevel gets an electron before any orbital

doubles up.

14. Which of the waves below has:

15. Fill in the chart:

Energy Level / Sub Levels / Total # of orbitals / Total # electrons
1 / s / 1 / 2
2 / s, p / 1 + 3 =4 / 8
3 / s, p, d / 1 + 3 + 5 = 9 / 18
4 / s, p, d, f / 1 + 3 + 5 + 7 =16 / 32

16. Which energy level has the least amount of energy associated with it? 1st energy level

Which has the most? 7th energy level

17. What is a valence electron? __electrons located in the outermost energy level______

18. How many valence electrons do each of the following elements have?

P: _5_ S: _6_ Ca: _2_ B: _3

19. Draw the Lewis dot diagram for each of the following elements. (a) Aluminum (b) Bromine

20. Name two other elements with the same Lewis dot structure as bromine._fluorine , _chlorine, _Iodine

21. What does the “4” represent in 1s22s22p63s23p64s1? __4th energy level__

Which element is this? __Potassium____

22. Write the electron configuration for Tin (Sn). 1s22s22p63s23p64s23d104p65s24d105p2

23. An element with the electron configuration, 1s22s22p63s23p64s23d104p65s24d8 , has _2_ electrons in its outer level.

24. How many protons are in a neutral atom with the following configuration, 1s22s22p63s23p64s23d5 ? _25_

25. How many valence electrons are shown? 5

1s 2s 2p 3s 3p

26. Write the noble gas electron configuration for Germanium (Ge). [Ar] 4s23d104p2

27. Draw the orbital filling diagram for Chromium.

1s 2s 2p 3s 3p 4s 3d

28. Describe what happens when an electron gains energy? The electron moves to the excited state and “jumps up” to a higher energy level.

29. Explain what happens when an electron “falls” from a higher energy level to a lower level.

The electron falls back to the ground state (lower level) and releases energy seen as a photon of light.

27. On the wave below, label the following parts: wavelength, crest, trough, wavelength, amplitude.

28. Using the line spectra below, identify the element not found in the mixture. ___Cadmium____

29. . The diagram below represents some parts of the electromagnetic spectrum.

What are the numbered parts?

1 / infrared / 2 / 3 / 4 / gamma

(a) 1-radio 2-visible 3-ultraviolet 4-x-rays

(b) 1-visible 2-ultraviolet 3-x-rays 4-radio

(d) 1-visible 2-ultraviolet 3-radio 4-x-rays