Step 1: Materials Steps 2 and 3  2 inch piece of calcium carbonate (white chalk)  25 mL 1M hydrochloric acid  mortar and pestle  spoon  50 mL beaker Step 4  40 mL water  100 mL beaker  hot plate  hot pad Step 5  2 g copper sulfate pentahydrate  spoon  crucible  crucible tongs  clay triangle  tripod  Bunsen burner Steps 6  1 spoonful iron filings  1 spoonful powdered sulfur  spoon (2)  petri dish  magnet Step 7  25 mL 0.1M potassium iodide  10 mL 0.1M lead nitrate  50 mL beaker  25 mL graduated cylinder Step 8  25 mL 1M hydrochloric acid  3 cm magnesium ribbon (2)  50 mL beaker  thermometer  tweezers Step 9  1 candle on dish  matches Step 2: Calcium carbonate a) Place a 2-inch piece of calcium carbonate (from chalk) in a mortar. Crush the calcium carbonate with the pestle. b) Record all changes observed, the type of change, and your reasoning in the data table. c) Keep for Step 3. Step 3: Calcium carbonate and hydrochloric acid a) Pour approximately 25 mL of 1M hydrochloric acid into a 50 mL beaker. b) Use the spoon to add crushed calcium carbonate from Step 2 to the hydrochloric acid. c) Record all changes observed, the type of change, and your reasoning in the data table. d) When finished, dispose of the mixture by pouring it into a receptacle provided by your teacher. Step 4: Water a) Fill a 100 mL beaker with 40 mL of water. Note its physical characteristics. b) Using a hot plate, heat the water until it boils. c) Record all changes observed, the type of change, and your reasoning in the data table. d) Use the beaker tongs to remove hot beaker from hot plate and place on a hot pad. e) Turn off the hot plate and dispose of the water in a drain. Step 5: Copper sulfate pentahydrate a) To allow heating, place the clay triangle on top of the tripod and position the Bunsen burner under the tripod. b) Measure 2 g (approximately 1/2 tsp.) of copper sulfate pentahydrate in a crucible. Note its physical characteristics. c) Place the crucible on the clay triangle. Student Guide (continued)