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Fizzling Rocks! - A Study on Acid Precipitation - Page 2

© Angela Plumb

3. Examine the texture of each sample and record your observations in the "other" column. You may be using polished or treated rocks (e.g. Marble). What affect do you think this will have on the outcome of your experiment?

4. Using the eye dropper, add a few drops of vinegar to the first rock sample. Look closely for any bubbles forming, and listen for any fizzing noises. Record your observations in your chart.

5. Repeat step 4 for each of the rock samples, making careful observations each time.

Questions:

Acids react chemically with some types of rocks, and the bubbles and fizzing are evidence of a gas being formed. Over a long period of time, the acid will eat away at the rock, gradually stripping away the outer layers. You can imagine why people are concerned for their historical monuments and buildings.

1. How are the types of rocks you studied used by people?

2. The chemicals that form acid precipitation come from power plants that burn oil or coal. In order to reduce the amount of acid precipitation, we must reduce the amount of oil or coal we burn - and that means saving energy. Make a list of things you can do to save energy.

Extension:

Visit a local cemetery with markers or monuments over 100 years old. Make observations of the dates and the conditions of the monuments. Can you make any conclusions?

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