Students will be able to explain that if two substances cause turn a pH indicator different colors, they must be different substances. Students will be able to explain that the color that a substance ...

Some chemical reactions change temperature, change color, produce a gas, or make a solid from two liquids. Try this reaction and see what it does! Pour 1 tablespoon of hydrogen peroxide into a cup.

Some molecules respond to light in a matter of seconds. In the case of this dithienylethene compound, ultraviolet light triggers a ring-forming reaction, turning the colorless solution deep red.

Color photos ... In the presence of oxygen or moisture or temperature changes—or, worst of all, all three—light can trigger chemical reactions that can degrade the very substance of the ...

Note: no sound] This is the striking moment that a chemistry experiment showcased the mesmerizing iodine clock reaction, vividly capturing the transformation of liquids through a series of color ...

A change is called irreversible if it cannot be changed back again. Many chemical reactions are irreversible. In a chemical reaction, new materials are always formed. Sometimes these new materials ...