SCIENCE:

Acid Rain

           

Today's Snack: Vinegar can do harm, as in the experiment below, but it also can do good things with food. Mix vinegar with salad oil and a packet of dry salad dressing mix, and pour a few spoonfuls over a bowl full of cherry tomatoes, zucchini slices, squash slices, diced green pepper, crispy carrot chunks and sliced celery.

 

 

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Supplies:

20 seeds per student or team

2 zip-lock bags | 2 paper towels

Vinegar | Water | tablespoon | Sharpie pen | small container

 

 

1. Fold a paper towel so that it will fit it inside a zip-lock bag.

 

2. Fold the other paper towel the same size.

 

3. Moisten one of the paper towels in one of the sacks with a tablespoon or two of water.

 

4. Count 10 seeds and place them between the layers of the paper towel.

 

5. Slide the paper towel and seeds into one of the zip-lock bags.

 

6. Label that bag "WATER" with the Sharpie pen.

 

7. 4. Now, for the other sack: in the small container, mix one tablespoon of vinegar and one tablespoon of water. Moisten the other paper towel with the vinegar-water mixture.

 

8. 5. Count out another 10 seeds and place them between the layers of the paper towel moistened with vinegar and water.

 

9. Label that bag "VINEGAR" with the Sharpie pen.

 

10. Every two days, inspect your seeds. Re-moisten the paper towels if they start to dry out - plain water for the "WATER" bag, and vinegar-water for the "VINEGAR" bag.

 

11. After eight to 10 days, what do you notice? Why do you think this has happened? Do more research on pollution in general, and acid rain in particular, and write a short report.

By Susan Darst Williams • www.AfterSchoolTreats.com • Science 09 • © 2010