Chemical and Physical Change Lab Instructions Follow instructions carefully and record your data in the data table. Activity One: Alka Seltzer and Water 1. Place the Alka seltzer tablet into the balloon 2. Measure 150 ml of water into the Erlenmeyer flask. 3. Place the balloon over the mouth of the flask without emptying any of the contents into the water. 4. Find the mass of the flask and balloon on the digital scale and record. 5. Return to your seat and empty the contents of the balloon into the water. Record your observations. 6. Find the mass of the flask and balloon on the digital scale and record. Activity Two: Lemonade Crystals and Water 1. Re