Carnegie STEM Girls: Now You See It, Now You Don’t

Your Challenge: How different are water and bleach when colors are involved?

Materials: 

Water

Bleach

Food Coloring

2 Clear Cups

Adult Supervision

 

Here’s How: 

  1. Fill one of the clear cups with room temperature water about 3/4 full
  2. Add 2 drops of food coloring to the water. Observe how the food coloring mixes with the water.
  3. Fill the other cup with bleach- 1/4 of the way full.
  4. Pour the mixture back and forth between the two cups 3-5 times. Once mixed, let the mixture sit. Observe the changes in color.

 

Take It Further:

Try conducting the experiment using different types of bleach: scented vs. unscented, different concentrations, or different brands.

 

 

How It Works:

Bleach fades color. The process happening is called bleaching or whitening. It is a result of oxidizing or reducing. The molecules, after being oxidized, will no longer absorb the visible light. The molecules do not fade, they actually spread out, giving them the impression that their color is lost.

Resource

Related Careers:

Chemist, Chemical Engineer


Science Topics
Chemistry, Oxidation
Middle School, High School
8th Grade, 9th Grade, 10th Grade, 11th Grade, 12th Grade

What are you looking for?

Organization

Carnegie STEM Girls

Website URL

Type of Resource

Tutorial

Assigned Categories