MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

The proper relationship of wavelength (8) to light energy (E) is:

a. increased wavelength correlates to increased energy

b. increased wavelength correlates to decreased energy

c. wavelength is independent of energy

d. wavelength is independent of frequency

Correct Answer: b

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

A proper expression for the relationship between light energy (E) and wavelength (8), where c is the speed of light in a vacuum and h is PlankÕs constant, is:

a. E=hc8

b. 8=Ehc

c. 8=hc/E

d. E=8/hc

Correct Answer: c

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

When an electron in an atom moves from a lower energy state to a higher energy state, the electron will

a. absorb energy, only

b. release energy, only

c. both absorb and release energy

d. neither absorbs nor release energy

Correct Answer: a

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

What causes the emission of radiant energy that produces characteristic spectral lines?

a. neutron absorption by the nucleus

b. gamma ray emission from the nucleus

c. movement of electrons to higher energy levels

d. return of electrons to lower energy levels

Correct Answer: d

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

The characteristic bright-line spectrum of an element is produced when electrons

a. absorb quanta and return to lower energy levels

b. absorb quanta and move to higher energy levels

c. release quanta and return to lower energy levels

d. release quanta and move to higher energy levels.

Correct Answer: c

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

The light produced by signs using neon gas results form electrons that are

a. moving from a higher to a lower principal energy level

b. moving from a lower to a higher principal energy level

c. being lost by the Ne(g) atoms

d. being gained by the Ne(g) atoms

Correct Answer: a

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

During a flame test, ions of a specific metal are heated in the flame of a gas burner. A characteristic color of light is emitted by these ions in the flame when the electrons

a. gain energy as they return to lower energy levels

b. gain energy as they move to higher energy levels

c. emit energy as they return to lower energy levels

d. emit energy as they move to higher energy levels

Correct Answer: c

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

What type of radiation has neither mass nor charge?

a. gamma

b. neutron

c. alpha

d. beta

Correct Answer: a

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

1. Which color visual light has the highest frequency?

a. green

b. red

c. yellow

d. blue

e. violet

2. Which color of light has the lowest frequency?

a. green

b. red

c. yellow

d. blue

e. violet

Correct Answers:

1. e

2. b

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

Of the particles listed here, which is most involved with quantum theory?

a. electron

b. proton

c. neutron

d. nucleus

e. quark

Correct Answer: a

MC	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

The color of light emitted by an atom is most related to

a. energy release by the electron

b. mass of the electron

c. potential energy of the electron in the ground state

d. size of the electron

e. strength of charge on the electron

Correct Answer: a

I	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

Frequency

Frequency

Energy

Wavelength

1. From the above graphs, describe the relationship between energy, wavelength, and frequency.

a. as the wavelength increases, the frequency and energy decrease

b. as the frequency increases, the wavelength and energy decrease

c. as the energy increases, the frequency and wavelength decrease

d. as the energy increases, the frequency and wavelength increase

2. From the above graphs, describe how you could increase the energy of light the most.

a. increase the wavelength

b. decrease the wavelength

c. decrease the frequency

d. increase the wavelength while decreasing the frequency

Correct Answers:

1. a

2. b

I	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

Electromagnetic radiations are photons traveling in waves at the speed of light. The wavelength is the distance from the crest of one wave to the crest of another. Frequency is the number of waves that pass a given point in one second (waves/sec).

Answer the following questions using the above diagram and statement.

1. a. The electromagnetic spectrum shows the relationship between:

a. the mass of light and its force

b. the forces caused by light and the wavelength

c. the amount of energy and wavelength

d. the electrical power and strength of energy

e. gamma and radio waves only

b. List one fact shown in the diagram above that supports the correct answer:

2. a. Which of the following occurs as energy of electromagnetic radiation increases ?

a. wavelength increases

b. wavelength decreases

c. frequency increases

d. frequency decreases

e. both b and d are correct

b. List the evidence on the diagram above that supports your answer:

3. a. Of the colors listed below which one has the highest energy ?

a. blue

b. green

c. orange

d. red

e. yellow

b. Explain why your answer is correct.

4. a. When an excited electron drops from the 4^th orbital to the 2^nd orbital, a photon that exhibits the color green. What would the color be of a photon emitted when an electron drops from the 3^rd to the 2^nd orbital ?

a. blue

b. green

c. purple

d. yellow

e. white

b. Explain why your choice is correct.

Correct Answers & Scoring Rubric:

2 pts each Correct multiple choice answer for each question

1a. c 3a. a

2a. e 4a. d

2 pts each 1b. Energy wavelengths increase from left to right and the amount of energy of waves decreases from left to right.

2b. Use the same answer as 1b. above

3b. See how the colors are arranged in the visible part of the spectrum indicates the energy level of the color.

3 pts 4b. The third energy level of the atom has less energy than the fourth. Thus the electron would release less energy (longer wavelength) than would the fourth energy level. The color of the wave would be of lower energy (yellow)

2 pts each Correct spelling, punctuation and language usage

P	Chemistry	Standard: 02
Objective: 01. Evaluate quantum energy changes in the atom and the energy of light emissions.
ILO:

Flame Test

TEACHER INFORMATION SHEET

Pre Lab information:

1. The student should have completed a laboratory assignment using the flame test as a tool to identify some ions. This test can be done individually. The student should be familiar with the color of the ions used in the test.

2. All solutions are .1 molar.

3. Soaking Balsa wood chips or small pieces of paper in the solutions over night will give good test results.

Purpose: Students are to identify metals previously worked with in lab using a the flame test.

Materials: Six testing stations with an unknown solid salt in a numbered test tube.

Station number: Chemical:

1 LiCl

2 NaCl

3 KCl

4 BaCl₂

5 SrCl₂

6 CuCl₂

7 Unknown

Provided at each station:

test tube rack Bunsen burner

Test tube containing 6M nichrome wire loop

hydrochloric acid, HCl cobalt - chloride (blue) glass square

Time: 55 min

Procedure:

1. Tell students the desired outcomes for the laboratory practical, and explain the standards for assessment. Give each student a record sheet. Remind students to record their data on their record sheets.

2. Send six students, one per station, to the test area. Tell students to record on their record sheets the number of the test tube containing the metal salt. Have students identify the metal in the metal salt using a flame test.

3. Observe how each student performs the test.

4. After 3 minutes, tell students to move to the next station.

5. Repeat step 3 until all students have completed the test.

6. Send the next group of students to the test area.

7. Have each student turn in their record sheet when they finish.

FLAME TEST REPORT SHEET

Course Standard: _____ Objective: _____

STUDENT RESPONSE SHEET

Student Name: ____________________________ Period: ______ Date: ______ Score: _____

Purpose: To be able to identify using a flame test the metal in a salt.

Procedure:

1. Pick up a report sheet from the instructor.

2. Find a station when directed to do so and follow the directions below:

a. Wait until the instructor tells you to move. All students will have the same time at each station.

b. Test the salt in the numbered test tube.

c. Record the color of the flame and the metal symbol in the data table.

d. When you have completed all the tests turn in your results to your instructor.

	Metal Ion	Color
1.
2.
3.
4.
5.
6.
7.

High Energy V B G Y R Low Energy

Based on the above diagram of the visible spectrum and the fact that when an electron changes orbitals the energy released as a photon is proportional to the orbital change, rank the following in terms of greatest average orbital change to lowest average orbital change: Na, Sr, Cu

Highest: Next: Lowest:

Correct Answer:

Cu, Na, Sr. (6 pts possible if listed in order)