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Observing emission spectra

Free essay example:

DATO:19/09-07

NAME:SULEMAN ESAM

Exercise

Observing emission spectra

Aim: To see different kinds of spectrums, and their appearance.  

Equipment:

  • Spectrometer
  • Magnesia rods
  • HCL ca. 6 mol dm-3
  • Mercury discharge tube
  • Safety glasses
  • burner
  • NACL
  • KCL
  • CACL2
  • BACL2
  • CUCL2
  • LICL
  • SRCL2

Procedure:

Part 1:

First I looked at a patch of daylight through the spectrometer and saw a continuous spectrum.

Then I dipped the magnesia rod into 6M HCL and burned it very quickly. I looked through the spectroscope and saw an orange line. Afterwards I dipped the magnesia rod into 6M HCL and then into one of the solid compounds and burned it, and saw it through the spectroscope.  I repeated this with every compound. The result showing in the spectroscope is given in the chart below.  

Compound

Violet

Green

Yellow

Orange

red

NACL

KCL

CACL2

BACL2

CUCL2

SRCL2

In CUCL2 every lines from violet-green was visible

In SRCL2 every lines from orange-red was visible

PART 2:

  1. I turned on an incandescent lamp and looked at it through a spectroscope. I saw a continuous spectrum.
  2. Then I saw the fluorescent lamp through a spectroscope, and I saw all the colours, but they are in the background, except 4 specific colours. Violet, blue, green and red.

3.  With use of mercury discharge tube, I saw some gases through spectroscope. The chart                                                        is listed below.

Gass

Violet

Blue

Green

Yellow

Orange

Red

Hydrogen

Krypton

Water vapor

Neon

Mercury

Helium

Questions:

  1. Different element have different test colours because, different element has their own unique energy shell.
  1. Yes, flame test could be useful in determining identities of metals in a mixture, but the   problem is that some of the metals give the same energy and that could cause problem.  
  1. A continuous spectrum contains all the colours visible to our eyes, but the line spectrum contains only one or more specific colour.
  1. Every element gives their specific line. Hydrogen gives a green and at red line in the spectroscope. Whenever we see only a green and a red line with the same wave length, we know that it is Hydrogen.

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

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