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No, pouring soda into a cup is a physical change because the molecules of the soda remain the same. Chemical changes result in the formation of new substances with different chemical properties.
The blue color that appears when pouring grape soda in a cup may be due to a chemical reaction between the soda and the cup material or the lighting conditions. The purple color of the soda may also appear differently in certain lighting, making it appear blue when poured into a cup. The interaction of the purple dye in the soda with the cup material or the lighting can create the blue hue.
Heating a cup of tea is a physical change, not a chemical change. The heat causes the molecules in the tea to move faster, but the chemical composition of the tea remains the same.
When a cup of hot tea cools down, it is a physical change, not a chemical change. The molecules in the tea are simply rearranging as the temperature drops, but the chemical composition of the tea remains the same.
For the best chemical reaction in a volcano experiment, use about 1/4 cup of vinegar and 1 tablespoon of baking soda.
The hypothesis for the "lava in a cup" experiment may be that when vinegar (acid) is added to baking soda (base), a chemical reaction will occur and produce carbon dioxide gas, which will create bubbly "lava" in the cup.