1. It’s the Law Lab - Grading

2. Introduction: Describe the law of conservation of mass. (1pt) Matter can’t be creted or destroyed Same # of atoms on both sides Mass should be the same on both sides – Write the chemical equation for the reaction and explain what the reactants and products will be in the lab Mixing vinegar & baking soda to get sodium acetate, water and carbon dioxide – Reactants:_vinegar & baking soda_________ (.5 pt) – Products: _sodium acetate, water, carbon dioxide______ Vinegar + baking soda  sodium acetate + water + carbon dioxide (.5 pt)

3. It’s the Law Lab continued… Safety: (1pt) – Goggles – Glassware Problem: (1 pt) – How does the mass of several chemicals change when mixing a chemical reaction for a closed system? – For an open system?

4. It’s the Law Lab continued… Hypothesis: “If the reaction is in a closed system then …” – “If the reaction is in an open system then…” – Discusses the mass staying the same or changing (.5 each) – If…then statement (.5) – Wrote why or because they thought that way (.5) Variables: (1 pt) – IV: Type of system – DV: Mass of the reaction – Constants: same amt of baking soda, vinegar, same brand, same flask, t.b.b

5. Don’t worry about materials & procedures

6. Data Table Measurements have units (-.5 each) Open system should have less mass (-1) Closed system should not have less than.5g less (-1)

7. Data Table

8. It’s the Law Lab Error Analysis: (1 pt) – Include any important factors that you think may have actually affected your results I will grade the questions