1 Name: Date: Period: Project Description: In this project, you will be ...

Evidence For Chemical Reactions LabAdapted from http://www.middleschoolscience.com/bag.htmObjective: In this lab, you will be observing a couple of chemical reactions andfinding ways to describe how you know chemical reactions have actuallyoccurred.Materials: sandwich size zip top bag (x3) 2 plastic spoons 2 tbsp calcium chloride (x3) 2 Tbsp. baking soda (x3)1 test tube of water (x3)30 mL of phenolphthalein (x3)Goggles, gloves, lab apronProcedure Bag 1:1. Place 2 tsp of baking soda into the bag.2. Add 30 mL of Phenolphthalein to the bag.3. Massage the bag to mix the contents.4. VERY CAREFULLY - lower the test tube containing 30 mL of water upright into the bag. Do not let any spill out.5. One group member should hold the test tube by squeezing the test tube gently from the outside of the bagwhile another group member squeezes the excess air out and seals the bag.6. Hold the test tube and bag up and slowly spill the water out of the test tube (while the bag is still sealed).Observe the reaction and record what you see and feel happening in the data section.7. Pass the bag around and let all group members look at and feel the contents of the bag.Procedure Bag 2:1. Place 2 tsp of calcium chloride into the bag.2. Add 30 mL of Phenolphthalein to the bag.3. Massage the bag to mix the contents.4. VERY CAREFULLY - lower the test tube containing 30 mL of water upright into the bag. Do not let any spill out.5. One group member should hold the test tube by squeezing the test tube gently from the outside of the bagwhile another group member squeezes the excess air out and seals the bag.6. Hold the test tube and bag up and slowly spill the water out of the test tube (while the bag is still sealed).Observe the reaction and record what you see and feel happening in the data section.7. Pass the bag around and let all group members look at and feel the contents of the bag.Procedure Bag 3:1. Place 2 tsp of baking soda into the bag.2. Place 2 tsp of calcium chloride.3. Add 30 mL of Phenolphthalein .4. Massage the bag to mix the contents.5. VERY CAREFULLY - lower the test tube containing 30 mL of water upright into the bag. Do not let any spill out.6. One group member should hold the test tube by squeezing the test tube gently from the outside of the bagwhile another group member squeezes the excess air out and seals the bag.7. Hold the test tube and bag up and slowly spill the water out of the test tube (while the bag is still sealed).Observe the reaction and record what you see and feel happening in the data section.8. Pass the bag around and let all group members look at and feel the contents of the bag.10