Hot Or Not

HOT OR NOT

Materials

Phenol red solution Sodium bicarbonate powder (baking soda) Calcium chloride powder Quart-size freezer bags Plastic spoons Medicine measuring cups Toothpicks

Procedure

1. Add 5 milliliters of sodium bicarbonate and 10 milliliters of calcium chloride to a plastic Ziploc freezer bag.

2. Measure 10 ml phenol red solution in a medicine measuring cup and place the cup inside the Ziploc freezer bag. Be careful not to spill the phenol red solution. Squeeze most of the air out of the bag, and then seal the bag.

3. While the bag is still sealed, spill the contents of the phenol red solution inside the Ziploc freezer bag. Record observations. Name physical properties of each substance such as: its state (solid, liquid, gas), color, clarity, density, boiling point, solubility, crystal structure, and odor.

Substance Property

Calcium chloride

Baking soda

Phenol red solution

Final product Questions

1. Describe what happens when the sodium bicarbonate and calcium carbonate are mixed together.

2. Describe what happens when the phenol red solution comes in contact with the sodium bicarbonate and calcium chloride.

3. What are evidences of chemical change?

4. What is an exothermic reaction?

5. Give 3 examples of everyday exothermic reactions.