1. How would you represent iron sulfide with particles? What evidence do you have? Are other combinations possible?

2. Separation & Formation of Water Send an electric current through it Provide energy

3. Relating to Pure Substances Provides evidence for our definition that elements are only made of one kind of atom; cannot be broken down (separated) any further Whereas some pure substances (compounds) such as water, can be broken down in simpler substances

4. Gay-Lussac The water demo was an example that provided Gay-Lussac with evidence for his “combining volumes” idea: Gay-Lussac’s Law of Combining Gas Volumes:  Volumes of gases in a chemical reaction are present in the ratio of small integers (T & P constant) 2H 2 (g) + 1 O 2 (g) 2H 2 O (g) Ratio? 2:1:2 So if 50 L of hydrogen gas reacted with 25 L of oxygen gas, how much water vapor would be produced?

5. Example Compounds

6. Avogadro