Different Gasses, Different Weights

MATERIALS NEEDED

balance scale (or supplies to make one)

small paper bags

tape

baking soda

quart jar or graduated cylinder

vinegar

Different Gasses, Different Weights Movie
Click for 354K QT movie.
Click for 107K QT movie.

STEPS TO FOLLOW:

one Obtain or make a balance arm scale.

two Open the paper bags and, attach with tape, one to each end of the balance arm in an open, upright position.

three Balance the scale. What is inside of the bags? (Air)

four Prepare the carbon dioxide gas in the graduated cylinder.

Mix : 1 T. baking soda and 1/4 Cup vinegar
Cover the jar with a piece of paper( place on top) as the bubbles fizzle.

five When most of the fizzing stops, uncover the jar, and immediately pour the gas into one of the bags.( Be careful not to pour any vinegar into the bag.) Observe.

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Last modified: Tue Mar 24 16:34:31 PST 1998