Matter is anything that has mass and takes up space(volume). Mass is a body of matter with no definite shape or size. A physical change is a change that doesn’t involve a change in the substances chemical identity. A physical change is one that commonly includes changing between the states of solid, liquid, and gas. The physical changes that occurred in the lab would include: mass of steel wool, ice and water, and the dissolved sugar. A chemical change is one that involves a reaction and can’t be brought back to normal after the change is done. A chemical change results in the formation of a new chemical substance. The chemical changes that occurred in the lab would include: sodium carbonate and calcium chloride, burning steel wool, and dissolved Alka-Seltzer. The system is the chemical reaction that happens and the surroundings are what goes on around the reaction. When we mixed the sodium carbonate and the calcium chloride during the lab, the chemical reaction that was going on when we mixed them was the system; everything around it was the surroundings. The definition of the law of conservation of mass is: matter cannot be created nor destroyed, only its form can change. In the lab, we burned a wad of steel wool. After being burned it appears that the mass of the wool is shrinking but really it is just changing form. If you gathered all of the bits after the burning of the wool, they would combine to equal the same mass that the wool originally weighed. Examples of possible error in the lab could have been that the scale wasn’t super accurate and the weight measures could have been off. Another error could have been that people didn’t accurately poor the right amount of chemical into the vial.
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