On Halloween, you take a glow stick, crack the capsule inside and shake it until it glows. This is an example of light energy being created from _____ energy.
(A) chemical
(B) mechanical
(C) solution
(D) thermal
I think it's A or D. I think it's more likely to be A.
Yes, (A) is correct. They convert chemical energy into light energy.
I agree
You are correct in considering options (A) chemical and (D) thermal as possible answers. To determine the correct choice, we need to understand the process involved in a glow stick.
A glow stick operates through a chemical reaction called chemiluminescence. Inside the stick, there are two separate compartments - one containing a hydrogen peroxide solution, and the other containing a mixture of a fluorescent dye and a diphenyl oxalate ester. When you bend the stick, it breaks the capsule inside, allowing the chemicals to mix.
The chemical reaction between the hydrogen peroxide and the diphenyl oxalate ester produces an excited state compound. This compound then transfers energy to the fluorescent dye, causing it to emit light. The light energy created in this process comes from the energy released during the chemical reaction.
Therefore, the correct answer is (A) chemical energy, as it represents the energy generated by the chemical reaction within the glow stick.