Alice and Marge are studying the properties of matter. The girls cut some silver-colored magnesium sheets into 3-inch long strips and then put one strip each into test tubes: one containing water and one containing acid. Nothing happened when they added the magnesium to the water. In the acid, bubbles formed and the test tube felt much warmer.

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Based on the description, it seems that Alice and Marge conducted an experiment to explore how magnesium reacts with different substances. They used magnesium sheets, cut into 3-inch long strips, and placed one strip each into two separate test tubes: one containing water and the other containing acid.

When they added the magnesium strip to the water, nothing happened. This suggests that magnesium does not react with water. Since there were no observable changes, it is likely that magnesium is not reactive towards water under normal conditions.

On the other hand, when they added the magnesium strip to the acid, bubbles formed and the test tube felt warmer. This indicates that a chemical reaction occurred between the magnesium and the acid. The formation of bubbles suggests that a gas was being produced during the reaction. Additionally, the increase in temperature suggests that the reaction was exothermic, meaning it released heat energy.

To summarize, from this experiment, Alice and Marge discovered that magnesium does not react with water but does react with acid. The formation of bubbles and increased temperature in the acid confirms the occurrence of a chemical reaction between magnesium and the acid.