1. “ Chemical Changes/Reactions” Investigation # Materials used (reactants) Observations 1 2 3 4 5 6 7 You should use several lines for each row of your table.

2. Investigation 1 Send your materials member to the front with the Ziploc bag for the citric acid. Send your materials member to the front with the Ziploc bag for the citric acid. Using the plastic spoon, place a ½ teaspoon of baking soda and a small scoop of citric acid into a plastic bag. Using the plastic spoon, place a ½ teaspoon of baking soda and a small scoop of citric acid into a plastic bag. Using your graduated cylinder, measure 10 mL of water. Using your graduated cylinder, measure 10 mL of water. Add 10 mL of water to the plastic bag. Close the bag. Add 10 mL of water to the plastic bag. Close the bag. Observe and record any changes that occur. Observe and record any changes that occur. Send your clean up member to the front with the baggie and its contents. Send your clean up member to the front with the baggie and its contents.

3. Investigation 2 Send your materials member to the front with the ziploc bag. Send your materials member to the front with the ziploc bag. Place 15 mL of H 2 O 2 (hydrogen peroxide) into the baggie. Place 15 mL of H 2 O 2 (hydrogen peroxide) into the baggie. Wait for an assistant to add a scoop of yeast to the baggie. Seal the baggie Wait for an assistant to add a scoop of yeast to the baggie. Seal the baggie Observe any record changes that occur Observe any record changes that occur Send your cleanup member to the front with the baggie and its contents. Send your cleanup member to the front with the baggie and its contents.

4. Investigation 3 Using your plastic spoon, place a level ½ teaspoon of flour in a plastic cup. Using your plastic spoon, place a level ½ teaspoon of flour in a plastic cup. Measure 10 mL of water in your graduated cylinder. Measure 10 mL of water in your graduated cylinder. Add 10 mL of water the cup. Add 10 mL of water the cup. Stir with the craft stick Stir with the craft stick Observe and record any changes that occur Observe and record any changes that occur Send your clean up member to your designated sink to empty and rinse your cup. Send your clean up member to your designated sink to empty and rinse your cup.

5. Investigation 4 Using your plastic spoon, place a level ½ teaspoon of flour in a plastic cup. Using your plastic spoon, place a level ½ teaspoon of flour in a plastic cup. Add 3 drops of tincture of iodine to the cup Add 3 drops of tincture of iodine to the cup Observe and record any changes that occur Observe and record any changes that occur Send your clean up member to your designated sink to empty and rinse your cup. Send your clean up member to your designated sink to empty and rinse your cup.

6. Investigation 5 Using your plastic spoon, measure a level ½ teaspoon of baking soda. Using your plastic spoon, measure a level ½ teaspoon of baking soda. Place a small scoop of baking soda into the cup. Place a small scoop of baking soda into the cup. Use the graduated cylinder to measure 5mL of vinegar. Use the graduated cylinder to measure 5mL of vinegar. Add 5 mL of vinegar to the baking soda in the cup. Add 5 mL of vinegar to the baking soda in the cup. Observe and record any changes that occur Observe and record any changes that occur Send your clean up member to your designated sink to empty and rinse your cup AND GRADUATED CYLINDER. Send your clean up member to your designated sink to empty and rinse your cup AND GRADUATED CYLINDER.

7. Investigation 6 Using your plastic spoon, place a level ¼ teaspoon of salt into a plastic cup Using your plastic spoon, place a level ¼ teaspoon of salt into a plastic cup Measure 10mL of water using your graduated cylinder. Measure 10mL of water using your graduated cylinder. Add 10 mL water to the cup Add 10 mL water to the cup Observe and record any changes that occur Observe and record any changes that occur Send your clean up member to your designated sink to empty and rinse your cup. Send your clean up member to your designated sink to empty and rinse your cup.

8. Investigation 7 Send your materials member to the front to obtain your cabbage juice. Send your materials member to the front to obtain your cabbage juice. Use the eyedropper to add 20 drops of cabbage juice to the test tube. Use the eyedropper to add 20 drops of cabbage juice to the test tube. Use the graduated cylinder to measure 5 mL of vinegar. Use the graduated cylinder to measure 5 mL of vinegar. Add the vinegar to your test tube. Add the vinegar to your test tube. Observe and record any changes that occur Observe and record any changes that occur Send your cleanup member to your designated sink to empty and rinse your test tube, eye dropper and graduated cylinder. Send your cleanup member to your designated sink to empty and rinse your test tube, eye dropper and graduated cylinder.

9. Physical and chemical changes Read pages 69D-72D Read pages 69D-72D Create a tree map on page 50 of your notebook reflecting the information you read about physical and chemical changes. Create a tree map on page 50 of your notebook reflecting the information you read about physical and chemical changes. Add drawings to illustrate your descriptions and examples

10. Physical and chemical changes Return to the data table you created on page 51. Return to the data table you created on page 51. Label the last column on the right “Chemical or Physical Change.” Label the last column on the right “Chemical or Physical Change.” identify those investigations that involved a chemical change and those that involved a physical change. identify those investigations that involved a chemical change and those that involved a physical change.

11. On your lab data table (p51) On your lab data table (p51) –Label any reactions that were endothermic –label any reactions that were exothermic