Entry Task Separate Sheet of Paper. Answer the following questions. You

may use your notebook for help. You will turn this in and it will be graded based on correct answers. You have 5 minutes. How are the flame tests similar to

fireworks? How are they different? Define:

spectral lines Electromagnetic spectrum Energy

Procedure, p 1: Read the Intro, p 158.

Read the Cautions, p 158!

In our lab, we will be using four light sources: Incandescent lightbulbs Fluorescent tubes IR UV

Procedure, p1: Follow Steps in your Process

and Procedures 1a-b-c, on page 159.

Procedure, p3: Observe & Record spectra for 4 different

sources – incandescent, fluorescent, UV and IR. Put the spectroscope to your eye. Line up the slit with the light source Observe the spectral lines that appear on the scale. Draw a picture of what you observe. Use

colored pencils and try to include the same ‘spacing’ of the colored lines. Approximate the placement of lines using the scale in the spectroscope. (1 Å = 10-10 m)

Repeat for all 4 light sources You have about 20 Minutes to complete so we can

go over the P&P

P&P #5

5a. Were all spectra continuous?

Not all spectra were continuous. The incandescent light bulb produced a continuous spectrum, and the fluorescent tube produced a partially continuous spectrum.

P&P #5

5b. Did all spectra produce thin lines of color?

The fluorescent tubes produced thin lines of color.

P&P #5

5c. Did all spectra show bands of black space with no color?

No, the fluorescent tubes had bright lines, but the space between the lines was mostly filled with color, not black lines.

P&P #5

5d. Were thin lines of color always separated by the same amount of black space?

No, the thin lines of color of different elements are separated by different amounts of black space.

P&P #5

5e. Were thin lines of color always located in the same place when comparing 2 different sources?

No, thin lines for the element and fluorescent tubes were in different locations.

Procedure Answer Question #5a-e, p 160. Question #6: Venn Diagram (use the whole page) 3 circles:

Incandescent Fluorescent Element tubes

Sample Answer

Take Home Lessons I Sometimes,

scientists form explanations for things they cannot observe directly. For instance, if you see a broken window and a baseball lying inside, it might be reasonable to infer that the ball did the damage.

It is reasonable to infer that energy is transferred from one ‘thing’ to another… light into heat, or chemical energy into mechanical.

Take Home Lessons II Fluorescent tubes

contain specific elements… producing thin line spectra.

Incandescent Lightbulbs have a thin wire through which electricity runs and burns white-hot… light a campfire, or like the sun!

Remember that each color has a different wavelength, which means a different amount of energy…

Emission spectra can

tell us about the composition of objects… like stars for instance!

Reflect and Connect pg. 160-161 #1-4 Write the Question Write the Answer Both need to be in complete sentences