1. Topic: Chemical Reactions
Essential Question: What is the law of conservation of mass, and how does it apply to chemical reactions?

2. Only the atoms present in the reactants can end up in the products.
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical reactions
Only the atoms present in the reactants can end up in the products.

3. Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
In a chemical reaction, bonds between atoms in the reactants are broken, and the atoms rearrange and form new bonds to make the products.

5. The molecules in two liquids can react to form a solid.
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Forming a precipitate
The molecules in two liquids can react to form a solid.
A solid formed from two liquids is called a precipitate.

6. Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Law of conservation of mass
During a chemical reaction, no matter is created or destroyed, it is just rearranged
2H2 + O2  2H2O 
The chemical equation is balanced H H H H O H H O O O H H