Grade Level: 9th to 10th; Type: Chemistry
This experiment examines the trend of reactivity in the alkaline earth metals as you go down the second column of the periodic table of elements.
- What do you think will happen as you go down the column of alkaline earth metals?
- What do you think would happen if you went to the first column of the periodic table?
- Do you notice a trend that could apply to the whole periodic table?
- ~0.1 piece of lithium
- Strontium turnings
- 50mL graduated cylinder
- 5- 100mL beakers
- Mass balance
- 3- 50mL beakers
- Universal indicator solution
- De-ionized water
- 3 Volunteers
- Measure 35mL of de-ionized water into each of the three 50mL beakers.
- Add 20 drops of universal indicator and 5 drops of vinegar to all three beakers. Swirl the solution to mix.
- Place 2 large pieces of calcium into the first 100mL beaker.
- Place 2 similar sized pieces of magnesium into the second 100mL beaker.
- Place 2 similar sized pieces of strontium into the last 100mL beaker.
- One person should be ready to time this next step.
- Each of the 3 volunteers should get ready to pour the vinegar solution into each of the beakers at the same time.
- The timing person should record the time it takes each beaker turns purple.
- If one element takes longer than 5 minutes, stop the time and write down 5+.
- You should now know which element reacts the fastest, faster, and slowest. With this data, look back at and answer the research questions.
Terms/Concepts: Reactivity, Alkaline-Earth Metals, Alkaline Metals, Periodic Table of Elements
Alkaline- Earth Metals: http://www.chemicalelements.com/groups/alkaline.html
Alkaline Metals: http://www.carondelet.pvt.k12.ca.us/Family/Science/Alkali%20Metals/
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