The reason why turning on a light bulb is a physical change is because there is a process of electrical energy being converted into light and heat. You still have the light bulb intact and no new substance is formed.
In a light bulb light is produced either by heating a tungsten filament to incandescence or by exciting the electrons of Mercury vapor. Either way, the chemical compositions of the components of the light bulb remain the same. They would have to change in some part of the process for this to be considered a chemical change.
In incandescent light bulb you heat thefilament to very high temperature. So that it becomes red hot and emits light. To prevent the filament from getting oxidized, you have have an inert gas filled in the bulb. Inert gas means 'noble'gas like Helium, Neon, Argon, Krypton. These gases do not take part in chemical reactions. So this is purely a physical change. Only about 5 % energy is converted to light and rest being emitted as heat radiation. You have designed the length and thickness in such a way to to give different amount of 'light'. Also the 'life' of bulb is designed. You can make a filament thicker and longer to increase the 'life' of bulb. But this is not done in order that next bulb should be sold and industry must go on.
physical change
No.
Turning on a glow stick is a chemical change because the chemicals inside the stick react to produce light. This reaction cannot be easily reversed, unlike physical changes where the substance retains its original properties.
A light bulb is not a change in and of itself but the process by which it gives off light is physical. While an electric current causes a given component of the bulb to glow (it may be the filament of an incandescent bulb or the vapor in a fluorescent one), but that substance does not change its chemical identity.
No, the color purple is a physical property of an object that results from the absorption and reflection of certain wavelengths of light. It is not the result of a physical or chemical change, but rather the interaction of light with the object's molecules.
This is both a physical and chemical change. The explosion involves the release of energy (heat and light), which is a chemical change due to the breaking of chemical bonds. The breaking of the wrapper into many pieces is a physical change as it does not involve any change in the chemical composition of the materials.
No.
Physical change
Physical change
Turning on a glow stick is a chemical change because the chemicals inside the stick react to produce light. This reaction cannot be easily reversed, unlike physical changes where the substance retains its original properties.
physical
A light bulb is not a change in and of itself but the process by which it gives off light is physical. While an electric current causes a given component of the bulb to glow (it may be the filament of an incandescent bulb or the vapor in a fluorescent one), but that substance does not change its chemical identity.
Most of the time the emission of light is a physical change but there are some chemical reactions which emit light as a byproduct of the reaction.
Its a chemical change hottie
Combustion is a chemical change, not a physical change. It involves a chemical reaction where a substance reacts with oxygen to produce heat, light, and new chemical compounds.
Heat, light, and change in odor can indicate a physical change depending on the context. For example, melting ice into water is a physical change because it does not alter the chemical composition of the substance. However, if a substance undergoes a chemical reaction that results in heat, light, and change in odor, then it would be considered a chemical change.
This is a physical change. When the electrons go through the filament (or gas), there is no chemical change, only the physical change of temperature. The electricity to power the light may be generated chemically (fossil fuels or batteries) or from a hydroelectric plant. The light from "glow sticks" is an example of light generated by chemical changes.
It is a physical change at least that is what I've been told