This entire week (and maybe next week) will be dedicated to completing our second PIT-BC of the semester. This project will be set up exactly like your semester test.
First, we will complete an exploratory activity on Monday and Tuesday. This lab will introduce you to the concept of the conservation of mass by looking at the reaction of Alka Seltzer and water. The Law of Conservation of Mass says that the amount of reactants in a chemical reaction is equal to the amount of products; matter cannot be created nor destroyed. In other words, the mass of the stuff that you start out with has to be the same as the mass of the stuff you end up with. We will discover that when the Alka Seltzer reaction takes place in an open beaker, much of the gas that is produced just escapes into the air. Because of this, we cannot accurately measure the mass of all of the products, so it appears that mass is not conserved in the reaction. However, when we complete the reaction inside of a flask with a rubber stopper in it, that gas is trapped and we can measure the mass of all of the products.
Here is a link the the exploratory activity
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