why the fire crackers burn with the lights of different colour
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The bright, colorful part of the fireworks display is caused by “excited” electrons in the atoms of different metal and salt compounds. These compounds are in little balls called stars, made of a similar compound to what makes a sparkler work. Different metals burn in different colors....
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Because they have different chemicals in them.
For example,
strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks)
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