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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Friday, October 21, 2011

Burning Color of Alkali and Alkali Earth Compounds

As we know, when we burn some compound of Alkali or Alkali Earth (in form of salt) with bunsen burner or in flammable solvent (ex: Ethanol), the compound will be given a beautiful color so that many salts of Alkali and Alkali Earth are used in Fireworks.

The question is: Where do they come from?

Now let's take an example, Sodium Chloride. We know that the Sodium ion has the electron configuration of (2,8) because it releases one of its electron to form sodium ion. When we burn this salt with bunsen burner, we give it energies. Remember, Heat is one of the forms of energy.

10 another electrons inside the sodium ion will get enough energy to make them can "walk" through their orbitals. But, this condition will make the ion unstable so that they will emit the energy they got in the form of Photon Energy.

The amount of this energy can be calculated with the formula of:

E = Photon Energy (Joule)
h = Planck Constant (6,636 x 10^-34 J/s)
c = Velocity of Light in Vacuum (299.792.458 m/s)
λ = Length of Wave (m)

When the energy is emitted by the electrons, it gives an amount that inversely with the length of Wave. The greater the energy, the shorter the length of wave. It is "a coincidence" that the photon energy of sodium is exactly the same on the length of Intensive Yellow so that we will see a bright intensive yellow light when we burn Sodium Chloride in a bunsen burner.

Now Let's see another color of Chemical Compounds' burning:

http://alchemist.edublogs.org/files/2008/11/flame-test.png




http://devianta.blog.uns.ac.id/files/2010/12/spektrum.jpg

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