In chemical reactions chemical changes occur -which is the rearrangement of the ions and atoms in compounds. Though compounds may break down and arrange themselves differently, nothing is lost or gained through the reaction.
Just like when you make a peanut butter and jelly sandwich, you start with peanut butter + Jelly + bread and you end with all three ingredients arranged differently. You don't end up with a straight up peanut butter sandwich nor do you end up with just a mess of PB and Jam... you start with three individual ingredients and those ingredients are present on the other side -even if they are arranged differently.
This is called the Law of Conservation of Mass -atoms are neither created nor destroyed in a chemical reaction regardless of the states of matter the compounds are in. The atoms that go into a reaction are the exact same atoms that come out of a reaction -the only difference is that they have rearranged themselves differently -they have formed different compounds!
Please visit the Notes page and open the "Law of Conservation of Mass LAB" and with the data collected in class, complete the lab as a report to hand in (Block B on Tuesday, Block 3 on Monday)
Guidelines for writing a report:
1. identify the question or the focus of your investigation
2. Predict what you think will happen
3. list materials
4. list (in detail) the procedure
5. record your data and observation
6. answer the questions in the analysis
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