Does a chemical reaction change color?

Answer 1

As the electrons change orbits, they change energy levels. The energy is released into photons - which is the light of a fire.

When different elements oxidize, they give off different energies - thus different colors.

Answer 2

chemicals normally acids and bases change their chemical nature due to bacteial growth after a certain period of time for example 0.01,0.1,1m Hcl expired after 6months normaly,iron salts expecially ferros salts are converted into ferric upon oxidation(photooxidation) Fe+2 ----> Fe+3 Cu+1-----> Cu+2 most of the chemicals due to hygroscopic or anhydrous nature change by absorbing moisture from air,like NaOH and anhydrous salts e-g CaCl2

Answer 3

It depends on what type of color change is being referred to.

In the case of pigmentation changes - Yes, it is a chemical change.

In other cases, the angle of light could change.

Answer 4

It depends on what kind of chemical reaction. lower energy chemical reactions are less likely to have color changes.

in other words, there is really no way to answer. Just one note: color change means chemical reaction, but chemical reaction doesn't always mean color change

Answer 5

A chemical reaction happens when different molecules interact causing the chemical change. The chemical changes means that the molecules that interacted are no longer present, but they have combined in a new way to form something else.

Answer 6

A permanent change of color can indicate a chemical change.

Answer 7

Only when put this way: the color is changed as a result of a (reversible) chemical (reaction) change of the indicator molecule

Answer 8

Some do, but not all.

Answer 9

A pH indicator.

Answer 10

no