Red Bull Chemistry (Allison Shiff)
Author
Allison Shiff
Principle(s) Illustrated
Signs of a Chemical Change include the formation of a solid when two liquids are combined.
Standards
NGSS
PS1B: Chemical Reactions
Substances react chemically in characteristic ways. In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different properties from those of the reactants. (MS-PS1-2),(MS-PS1-3),(MS-PS1-5)
8th Grade California State Standards
Reactions
5. Chemical reactions are processes in which atoms are rearranged into different combinations of molecules. As a basis for understanding this concept:
a. Students know reactant atoms and molecules interact to form products with different chemical properties.
Questioning Script
Prior knowledge & experience:
Students have already learned to identify some signs that a chemical reaction has occurred. One of the signs is the formation of a precipitate. They have learned that if you add two different liquids together and a solid is formed within the liquid that is evidence that a chemical reaction has happened.
Root question:
"Make a prediction - What do you think will happen if I combine RedBull with Milk?"
Target response
"You get milky RedBull"!
What is the correct answer:
A Chemical Reaction will take place that forms a precipitate!!
Common Misconceptions:
Students expect that when you add one liquid to another liquid that what you end up with is just a mixture of the two liquids. They base this expectation on their own personal experience of mixing two things together.
Photographs and Movies
This is a picture of a precipitate forming which is a sign of a chemical reaction