Lab: The Law Of Conservation Of Mass

Law of Conservation of Mass

The Law of Conservation of Mass states that mass is an isolated system, it is neither created or destroyed. It also states that the mass of the products in a chemical reaction must be equal to the mass of the reactants. All of our experiments in chapter two had to do with mass and in every experiment we found the mass of the reactants and the mass of the products and in each one there wasn’t a significant change in mass.

Antoine Lavoisier was the one who introduced the Law of Conservation of Mass. Lavoisier ran many experiments and he was famous for his accurate observations and his insistence on careful measurements. He used accurate balances that could measure very, very small changes in his experiments. All of

This was a physical change because you can still get the salt back after it was mixed with the water. The reactants were the salt and water separated. The products were the salt and water mixed (saltwater). We used a closed system because when measure the mass in a closed system you don’t want anything to enter or escape or the mass would be completely different when you do the experiment and for this we would want any salt of water to spill or leak.

In experiment 2.4 we figured out if the mass of ice changes when it melts into water. This was a physical change because you can still turn the water back into the ice by freezing it. The reactant in this experiment was ice and the product was water. We used a closed system in this experiment because we don’t want any water to leak out of the container because we would lose mass and that would mess everything up.

In experiment 2.5 we found if the mass of copper and sulfur changed after heating it. This was a chemical change because when we heated the copper and sulfur a whole new substance was formed. The reactants in this experiment were the copper and sulfur. The products were a liquid and a gas. We used a closed system because we didn’t anything to spill and because we were heating the copper and sulfur it will form a gas and we didn’t want that to escape or the experiment would be