Journal Entry:

A chunk of blue, solid Cobalt (II) Chloride, CoCl₂, is placed into some water. The water turns from  clear to pink in color

1. What type of change has taken place? How do you know?

2. Was something new made? Explain

Learning Intentions

• We will  learn the definition of physical and chemical change and explain the gray areas between.

• We will learn how to classify chemical equations as representing physical changes or chemical changes.

Closing Task:

 You can determine if a chemical equation represents a chemical or physical change.

Content Standards being covered:

Student understands what the letters and numbers stand for in a compound formula, can use those letter and numbers to determine how many of each type of element there are in a formula.

Student can create mathematical representations of chemical reactions and use them to make calculations about products and reactants.

Students can use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. (HS-PS1-7 and CCC Energy and Matter)