How to explain the chemical flame reaction

The flame color reaction is a reaction in which certain metals or their volatile compounds take on the characteristic color of a flame when it burns in a colorless flame. Some metals, or their compounds, can give a special color to the flame when burned.

This is because when the atoms of these metallic elements receive the energy provided by the flame, their outer electrons will be excited to the higher energy excited state. The outer electrons in the excited state are unstable and have to transition to a lower energy ground state. The outer electrons of atoms of different elements have ground states and excited states of different energies.

In this process, electromagnetic waves of different wavelengths are generated, and if the wavelength of this electromagnetic wave is in the visible wavelength range, the characteristic color of this element is observed in the flame.

This property of the element can be used to test the presence of some metals or metal compounds. This is the flame color reaction in the material test.

Metals and their salts produce different colors when burned. The flame color reaction allows the presence or absence of alkali metal elements to be identified based on the color of the flame. This is because when the alkali metal and its salts are burned on the flame, the electrons in the atom absorb the energy and jump from the lower energy orbital to the higher energy orbital, but the electrons in the higher energy orbital are unstable and soon jump back to the lower energy orbital, at which point the excess energy is released in the form of light.

The wavelength of the emitted light is in the visible range (wavelength 400nm to 760nm), so it can give the flame its color. Due to the different atomic structures of alkali metals, the change in energy during the electron transition is not the same, and different wavelengths of light are emitted, so the color of the emitted light is also different. The flame reaction is not a chemical change.

When observing the flame reaction color of potassium, it is necessary to filter out the yellow light through the blue cobalt glass to avoid the interference caused by sodium salt impurities mixed in the potassium salt.

The flame color reaction, also known as the flame color test and the flame color test, is a reaction that causes the flame to take on a special color when certain metals or their compounds are burned in a colorless flame. The principle is that each element has its own individual spectrum.

Samples are usually in the form of powders or small pieces. Load the sample with a clean and less active wire (e.g., platinum or nichrome) and place it in a matte flame (blue flame). In chemistry, it is often used to test for the presence of a metal in a compound.

At the same time, using the flame color reaction, people consciously add specific metal elements to the fireworks to make the fireworks more colorful and colorful.

Flame color test or flame color test.

Flame reaction is not a chemical change, it belongs to a physical change, flame color reaction, also known as flame color test and flame color test, is a reaction of some metals or their compounds to make the flame show a characteristic color when it is burned in a colorless flame, this process does not generate new substances, but only the transition of electrons, which should belong to physical changes. Flame reaction is not a chemical change, it is a physical change, flame color reaction, also known as flame color test and flame color test, is the characteristic color of the flame when some metals or their compounds are burned in a colorless flame'Reaction, this process has no new material generation, just a transition of electrons, which should belong to physical changes.

Not a chemical change. The reaction does not meet the basic requirements for chemical change: there is the formation of a new substance. Its essence is the change in energy caused by the transition of electrons.

The flame reaction is a physical reaction, not a chemical reaction.

That's right.

The various visible light released in the flame color reaction is essentially due to the high temperature of the heat source, and the energy of the metal ions that do the flame color reaction rises after being heated.

High, excited electron transitions, the energy difference between energy levels is released in the form of visible light, and no new matter is generated in this process, only.

It is a transition of electrons and should belong to the physical change.

Therefore, although it is called a flame color reaction, it is not actually a chemical change, but a physical change.

Contains sodium element na yellow.

Contains lithium element li purple red.

Contains potassium element K light violet.

Contains rubidium element RB violet.

Contains calcium, ca, brick red.

Contains strontium SR magenta.

Cu-green with copper elements.

Contains barium element BA yellow-green.

Contains cobalt element CO light blue.

Magnesium, aluminum alloy mg+al white.

The flame color reaction of the NA is yellow.

k is purple when seen through blue cobalt glass.

The flame color reaction of Fe is green.

Dip the clean platinum wire into the required substance (solid liquid is fine) and place it on a colorless flame.