The valence electrons of silicates in glass can't 'afford' the energy of light, so they don't get excited, while adding any transition metal in glass, they will get excited and therefore the glass will be coloured. The relation between absorbance of a molecule and the wavelength of light gives us the spectrum and it is pretty much important to know in order to understand the colours of any given substance.
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The carbon dioxide gas produced in these reactions can be tested. The test for carbon dioxide is:. Acids react with ammonia to form a salt. Reaction of acids 1.
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