Journal Entry:

Does this equation obey the law of conservation of mass? Why or why not? CuCl₂(aq) + Na₂S(aq) → CuS(s) + NaCl(aq)

Learning Intentions

• We will  learn how to balance a simple chemical equation.

• We will learn the role of coefficients in chemical equations to help satify the law of conservation of mass.

Closing Task:

 You can balance a chemical equation.

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)