Properties of Metals

Materials

Procedures

  1. Use wells #1 ~ 4 on the spot plate.
  2. Add 20 drops, about half-way filled, of distilled water into wells #1 ~ 4.
  3. Number the litmus paper from #1 ~ 4.
  4. Test the water in wells #1 ~ 4 with litmus paper
  5. Record your observations.
  6. Remove the litmus paper and keep them for reuse in step #13.
  7. Obtain a small piece of aluminum and place it in well #2.
  8. Use tweezers to handle calcium turnings because they may cause skin irritation.
  9. Obtain a small piece of calcium turning and place it in well #3.
  10. Obtain a small piece of magnesium ribbon and place it in well #4.
  11. Make observations on any reaction of each well.
  12. Record the results in the data table.
  13. Test the water in wells #1 ~ 4 with litmus paper, again.
  14. Record the results in the data table.
  15. Repeat steps #1 ~ #14, use hydrochloric acid instead of water this time.
  16. Discard all used materials in the trash can.
  17. Rinse and dry the spot plate with paper towel.

Data

Aluminum  Calcium  Magnesium 
reaction with H2O observation ??? ??? ???
litmus test before after before after before after
??? ??? ??? ??? ??? ???
Aluminum  Calcium  Magnesium 
reaction with HCl observation ??? ??? ???
litmus test before after before after before after
??? ??? ??? ??? ??? ???

Analysis

1. What is the purpose of well #1? ???
2. Rank the three metals tested from most active to least active. ???
3. Describe the periodic trend in metal reactivity within a group. ???
4. Describe the periodic trend in metal reactivity across a period. ???
5. Litmus paper changes color in acidic (red) and basic (blue) solution. The word alkaline is a synonym for basic. Why are the two words “alkaline” and “earth” used to name the Group IIA metals? ???
*Honors extension
6. Predict how the calcium reacts with water by writing the chemical equation. ???



How to do this assignment?

Chemistry in September