1. Copyright © 2011 InteractiveScienceLessons.com Materials: Procedure: NaHCO 3, CaCl 2 1. 2. 3. 4. 5. 6. BeforeAfter (goggles) (NaHCO3) (CaCl2) (water) (canister in bag; weigh)

2. Copyright © 2011 InteractiveScienceLessons.com CaCl 2 NaHCO 3 H2OH2O CO 2 CaCO 3 NaCl H 2 O Hot! Cold! Gas Before ____ grams After ____ grams Prediction: A physical change is a change in size, shape, color or state of matter. A chemical change is when a new substance is made by rearranging the atoms. Its properties are different from the original materials. Everything from before weighed the same as everything after. This is the Law Of Conservation Of Mass. Notes: 6. (mix, re-weigh)

3. Copyright © 2011 InteractiveScienceLessons.com Clean up 1.Pour out liquid contents of bag 2.Throw BAG away 3.Rinse canister 4.Re-stock box: New baggie & Handouts Canister, goggles, spoon, NaHCO 3, CaCl 2

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