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Read the entire procedure and the recommended safety precautions. you think extra pieces of calcium or magnesium metal should be disposed of down the drain? or why not?

Read the entire procedure and the recommended safety precautions. you think extra pieces of calcium or magnesium metal should be disposed of down the drain? or why not?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Read the entire procedure and the recommended safety precautions. you think extra pieces of calcium or magnesium metal should be disposed of down the drain? or why not?
**Safety Precautions** Calcium and magnesium are reactive, flammable solids and possible skin irritants. Use forceps or a spatula to handle these metals. Hydrochloric acid is toxic by ingestion and inhalation and is corrosive to skin and eyes; avoid contact with body tissues. Strontium and barium compounds are toxic by ingestion. Potassium iodide solution is moderately toxic and a strong irritant. Avoid contact of all chemicals with eyes and skin. Wear chemical splash goggles and chemical-resistant gloves and apron. Always wash hands thoroughly before leaving the laboratory. **Procedure** **Part A: Activity of Metals** 1. In a weighing dish or small beaker, obtain 2 small pieces of calcium turnings. 2. Obtain 2 small pieces of magnesium ribbon, approximately 1-cm each, and a short piece of aluminum foil. 3. Place a 24-well reaction plate on top of a sheet of white paper, as shown in the following figure. Note that each well is identified by a unique combination of a letter and a number, where the letter refers to a horizontal row and the number to a vertical column. ![Diagram of Reaction Plate](#) - The diagram shows a 24-well plate organized into 4 rows (A-D) and 6 columns (1-6). Each well is labeled based on its row and column positions, for example, A1, B2, C3, etc. 4. Use a pipet to add 20 drops of distilled water to wells A1–A3. 5. Test the water in wells A1–A3 with a piece of red litmus paper and record the initial color for this "litmus test" in Data Table A. 6. Use forceps to add one piece of calcium (step 1) to well A1. 7. Use forceps to add one piece of magnesium ribbon to well A2. 8. Tear off a 2-cm piece of aluminum foil and roll it into a loose ball. Add the aluminum metal to well A3. 9. Observe each well and record all immediate observations in Data Table A. If no changes are observed in a particular well, write NR (No Reaction) in the data table. 10. Test the water in wells A1–A3 with a piece of red litmus paper and record the color changes for this litmus test in Data Table A. **Periodic Trends and the
Transcribed Image Text:**Safety Precautions** Calcium and magnesium are reactive, flammable solids and possible skin irritants. Use forceps or a spatula to handle these metals. Hydrochloric acid is toxic by ingestion and inhalation and is corrosive to skin and eyes; avoid contact with body tissues. Strontium and barium compounds are toxic by ingestion. Potassium iodide solution is moderately toxic and a strong irritant. Avoid contact of all chemicals with eyes and skin. Wear chemical splash goggles and chemical-resistant gloves and apron. Always wash hands thoroughly before leaving the laboratory. **Procedure** **Part A: Activity of Metals** 1. In a weighing dish or small beaker, obtain 2 small pieces of calcium turnings. 2. Obtain 2 small pieces of magnesium ribbon, approximately 1-cm each, and a short piece of aluminum foil. 3. Place a 24-well reaction plate on top of a sheet of white paper, as shown in the following figure. Note that each well is identified by a unique combination of a letter and a number, where the letter refers to a horizontal row and the number to a vertical column. ![Diagram of Reaction Plate](#) - The diagram shows a 24-well plate organized into 4 rows (A-D) and 6 columns (1-6). Each well is labeled based on its row and column positions, for example, A1, B2, C3, etc. 4. Use a pipet to add 20 drops of distilled water to wells A1–A3. 5. Test the water in wells A1–A3 with a piece of red litmus paper and record the initial color for this "litmus test" in Data Table A. 6. Use forceps to add one piece of calcium (step 1) to well A1. 7. Use forceps to add one piece of magnesium ribbon to well A2. 8. Tear off a 2-cm piece of aluminum foil and roll it into a loose ball. Add the aluminum metal to well A3. 9. Observe each well and record all immediate observations in Data Table A. If no changes are observed in a particular well, write NR (No Reaction) in the data table. 10. Test the water in wells A1–A3 with a piece of red litmus paper and record the color changes for this litmus test in Data Table A. **Periodic Trends and the
**Periodic Trends and the Properties of Elements** **Page 4** 11. Continue to watch each well for 1–2 minutes. Record any additional observations comparing the rates of reaction in Data Table A. 12. Use a pipet to add 20 drops of 0.5 M HCl to wells C1–C3 (the first three wells in Row C). Measure the initial temperature of the solutions in well C1–C3 and record the values as an "observation" in Data Table A. 13. Use forceps to add one piece of calcium turnings (Step 1) to well C1. 14. Use forceps to add one piece of magnesium ribbon to well C2. 15. Tear off a 2-cm piece of aluminum foil and roll it into a loose ball. Add the aluminum metal to well C3. 16. Observe each well and record all immediate observations in Data Table A. If no changes are observed in a particular well, write NR in the data table. 17. Using a thermometer, measure the temperature of each solution in wells C1–C3. Record the temperature of each solution as an observation in Data Table A. 18. (Optional) Is there evidence that a gas is being produced in wells C1–C3? Test the combustion property of the gas by bringing a lit match to the space just above each well C1–C3. Record any observations for this "match test" in Data Table A. 19. Continue to watch each well for 1–2 minutes. Record any additional observations comparing the rates of reaction in Data Table A. 20. Dispose of the well contents as instructed by your teacher. Rinse the reaction plate with distilled water before using the plate again in Part B. --- **Part B. Solubility of Alkaline Earth Metal Compounds** 21. Place the 24-well reaction plate on top of a sheet of black paper. 22. Referring to Data Table B as a guide, use a pipet to add 20 drops of alkaline earth metal solutions to the appropriate wells, as follows: - Magnesium chloride to wells A2–C1 - Calcium chloride to wells A2–C2 - Strontium chloride to wells A3–C3 - Barium chloride to wells A4–C4 23. Use a clean pipet to add 20 drops of the unknown alkaline earth metal
Transcribed Image Text:**Periodic Trends and the Properties of Elements** **Page 4** 11. Continue to watch each well for 1–2 minutes. Record any additional observations comparing the rates of reaction in Data Table A. 12. Use a pipet to add 20 drops of 0.5 M HCl to wells C1–C3 (the first three wells in Row C). Measure the initial temperature of the solutions in well C1–C3 and record the values as an "observation" in Data Table A. 13. Use forceps to add one piece of calcium turnings (Step 1) to well C1. 14. Use forceps to add one piece of magnesium ribbon to well C2. 15. Tear off a 2-cm piece of aluminum foil and roll it into a loose ball. Add the aluminum metal to well C3. 16. Observe each well and record all immediate observations in Data Table A. If no changes are observed in a particular well, write NR in the data table. 17. Using a thermometer, measure the temperature of each solution in wells C1–C3. Record the temperature of each solution as an observation in Data Table A. 18. (Optional) Is there evidence that a gas is being produced in wells C1–C3? Test the combustion property of the gas by bringing a lit match to the space just above each well C1–C3. Record any observations for this "match test" in Data Table A. 19. Continue to watch each well for 1–2 minutes. Record any additional observations comparing the rates of reaction in Data Table A. 20. Dispose of the well contents as instructed by your teacher. Rinse the reaction plate with distilled water before using the plate again in Part B. --- **Part B. Solubility of Alkaline Earth Metal Compounds** 21. Place the 24-well reaction plate on top of a sheet of black paper. 22. Referring to Data Table B as a guide, use a pipet to add 20 drops of alkaline earth metal solutions to the appropriate wells, as follows: - Magnesium chloride to wells A2–C1 - Calcium chloride to wells A2–C2 - Strontium chloride to wells A3–C3 - Barium chloride to wells A4–C4 23. Use a clean pipet to add 20 drops of the unknown alkaline earth metal
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