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Chemistry
Chemical reaction/conservation of mass:
This is a classic experiment with baking soda and vinegar. Students would carefully place baking soda into a plastic 20 oz. bottle and then use a funnel to put vinegar into balloon. The student would then carefully place the mouth of the balloon over the mouth of the bottle and lift up the balloon dumping the vinegar into the bottle. As the reaction occurs, carbon dioxide is produced and inflates the balloon. This is a great tactile experience for the student to feel the balloon expanding. Students can also weigh the entire apparatus on a talking scale before and after the reaction to prove no matter was lost (Note: Some students may benefit from instruction in how to use a funnel before attempting to fill the balloon). This experiment works best if the student places both hands on the expanding balloon while a helper holds the mouth of the balloon secure on the bottle, otherwise you may have a balloon rocket. Older students can do this activity using test tubes. Safety Note: Be aware of latex allergies.