Question

Copper and chlorine compounds makes blue fire work Why?

Answer 1

• To produce colours, fire works experts hum the metal and chlorine together in a vapour, where the two elements are gases instead of solid. 
• The burning excites the electron pushing them into a higher than normal energy level. As the electrons returns to their normal level, they release their extra energy as a colourful burst of light. 
• True blue fireworks arc the hardest to make since the compound copper chloride breaks down in a hot flame.