Question:

Chemistry

The green colour seen in firework displays is due to the chloride salt of

1

strontium
2

barium
3

sodium
4

calcium

The Chemistry of Fireworks

There are two main mechanisms of color production in fireworks-

Incandescence is the emission of light caused by high temperature. As a substance heats up it emits colors in different stages starting with infrared, then red, orange, yellow, and white as it becomes increasingly hotter. The temperature of a firework can be controlled and with different components added such as charcoal, can be manipulated to be a desired color at the proper time. Metals, such as aluminum, magnesium, and titanium, burn very brightly and are useful for increasing the temperature of the firework.
Luminescence the emission of light by a substance that has not been heated. To produce luminescence, energy is absorbed by an electron, causing it to become excited, but unstable. When the electron returns to a lower energy state the energy is released in the form of a photon (light). The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors.

List of colors and elements in Fireworks:

Aluminum – Aluminum is used to produce silver and white flames and sparks. It is a common component of sparklers.

Antimony – Antimony is used to create firework glitter effects.

Barium – Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements.

Calcium – Calcium is used to deepen firework colors. Calcium salts produce orange fireworks.

Carbon – Carbon is one of the main components of black powder, which is used as a propellant in fireworks. Carbon provides the fuel for a firework.

Chlorine – Chlorine is an important component of many oxidizers in fireworks. Several of the metal salts that produce colors contain chlorine.

Copper – Copper compounds produce blue colors in fireworks.

Iron – Iron is used to produce sparks. The heat of the metal determines the color of the sparks.

Lithium – Lithium is a metal that is used to impart a red color to fireworks. Lithium carbonate, in particular, is a common colorant.

Magnesium – Magnesium burns a very bright white, so it is used to add white sparks or improve the overall brilliance of a firework.

Oxygen – Fireworks include oxidizers, which are substances that produce oxygen in order for burning to occur. The oxidizers are usually nitrates, chlorates, or perchlorates. Sometimes the same substance is used to provide oxygen and color.

Phosphorus – Phosphorus burns spontaneously in air and is also responsible for some glow-in-the-dark effects. It may be a component of a firework’s fuel.

Potassium – Potassium helps to oxidize firework mixtures. Potassium nitrate, potassium chlorate, and potassium perchlorate are all important oxidizers.

Sodium – Sodium imparts a gold or yellow color to fireworks, however, the color may be so bright that it masks less intense colors.

Sulfur – Sulfur is a component of black powder. It is found in a firework’s propellant/fuel.

Strontium – Strontium salts impart a red color to fireworks. Strontium compounds are also important for stabilizing fireworks mixtures.

Titanium – Titanium metal can be burned as powder or flakes to produce silver sparks.

Zinc – Zinc is used to create smoke effects for fireworks and other pyrotechnic devices.

The Sound Fireworks Make
The loud booms that are heard with the firework show is the result of the rapid release of energy in the air which then makes the air expand faster than the speed of sound. This creates a small sonic boom.

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