Chemistry Conservation Lab

The Law of Conservation states that mass can neither be created or destroyed. There are two types of changes that can happen, a physical change is when the reaction can be reversed and all reactants are separated. A chemical change is when the reaction changes the reactants and creates a brand new substances that can’t be reversed.
Antoine Lavoisier had the main contribution to The Law of Conservation. He wrote a textbook in 1789 on chemistry in it he introduced the Law of Conservation. He founded the 3 types of matter (solid, liquid, and gas). Along with this he also established the metric system. Lavoisier also made a lot of enemies because he had disproved various old theories.
In experiment 2.1 we wanted to know if the mass of salt will
This was a physical change because the water can be frozen again to turn back into ice, then melted and it will turn into water. The reactant of this lab was ice, the product was water. Once again it was a closed system lab because we didn’t want any mass that wasn’t from the ice to enter or escape the lab because it would throw-off the data.
We conducted experiment 2.5 to see if the mass of copper and sulfur changed when it was heated. This lab was a chemical change because the copper and sulfur created an unknown substance and the two couldn’t be extracted. The reactants were copper and sulfur. An unknown substance was the product of this lab. This was another closed system lab because it was a mass experiment and we didn’t want any outside factors adding or letting mass escape.
Experiment 2.6 was performed to see if the mass of a solid and liquid would change when it was converted to a gas. This was a chemical change because the unknown liquid and gas couldn’t be changed back into water and an alka-seltzer tablet. The reactants were an alka-seltzer tablet and water. The product was an unknown liquid and gas. Experiment 2.6 was a closed system lab because we didn’t want any mass to enter or