After the fireworks are lit, a chemical reaction similar to the above causes an explosion, and most of the energy released during the explosion is converted into light energy. Adding some luminescent coloring agents in the process of making fireworks can make fireworks emit colorful colors.
Fireworks are made of this property of metal.
Fireworks makers skillfully arrange and decide the order of burning. In this way, after the fireworks are detonated, bright and colorful patterns can bloom in the dark sky, which is often called flame reaction in middle schools.
Different kinds of metal compounds will emit different colors of light when burning.
For example, sodium chloride and sodium sulfate are sodium compounds, which will emit a golden flame when burned. Similarly, when calcium nitrate and calcium carbonate burn, they will emit a brick-red flame.
In chemistry, the above results are often used to test the metals contained in substances. This type of experiment is called flame test.
Ordinary flame color test:
1, aluminum-magnesium alloy will emit dazzling white light when burning;
2. Strontium nitrate and lithium emit red light when burning;
3. Sodium nitrate will emit yellow light when burning;
4. When barium nitrate burns, it will emit green light.
Extended data:
The main component of fireworks is black powder, which contains sulfur, charcoal powder, potassium nitrate and some potassium chlorate. Fireworks are made by adding magnesium, aluminum, antimony and other metal powders and strontium, barium, sodium and other metal compounds to gunpowder in a certain proportion.
Because different metals and metal ions will show different colors when burning, fireworks will give off colorful sparks when they explode in the air.
Metal compounds contain metal ions. When these metal ions react violently with oxygen molecules, you will see the compound burn and emit a unique flame color.
In order to protect the environment, many fireworks and firecrackers do not use substances containing heavy metals and sulfur elements, thus reducing the production of sulfur dioxide and other sulfides.
Secondly, the consumption of metal powder is reduced, and organic matter is basically used as combustible, thus reducing the inhalable particulate matter produced after the combustion of metal powder. ?
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