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Is there a material that will change color when a part of it comes in contact with a liquid And when it loses contact with the liquid it changes back to the original color?

I dont knao of an liquid sensig material but perhaps one of the temperature sensitive materials would do if the liquid you are sensing does not have the same temperature as the substrate on which you coul apply the liquid crystals that change color according to temperature (there are many in a wide array of temperature sensitive ranges)


When green powder is heated it turns black and a gas is produced is this a reversible or irreversible change?

when green powder is heated, it turns black and a gas is produced. in irreversible changes, new materials are always formed. given that a gas is produced, which is a new material, heating green powder is an irreversible change.


Is deposition chemical or physical change?

Deposition is a physical change because it involves a substance transitioning directly from a gas to a solid state without going through the liquid phase. It is the reverse process of sublimation, where a solid changes directly into a gas.


Is rubbing a marker on a paper a chemical reaction?

Rubbing a marker on paper does not involve a chemical reaction. The transfer of ink from the marker to the paper is a physical process, specifically the physical adhesion of the ink to the paper fibers.


Is fruit decaying a chemical change?

An apple decays over the period of around 1-2 months depending on the conditions that it is in. To help with the decomposition process, humidity in the air can attract insects to decay the apple.