Problem: Indicate whether the following is a physical or chemical change. a. Over time, liquid water in an open container evaporates and becomes a vapor in the air b. Gasoline burns in air when exposed to spark or high heat. c. After cutting a piece of sodium in air, the surface of the metal changes from a highly shiny surface to a dull gray color

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Indicate whether the following is a physical or chemical change.

a. Over time, liquid water in an open container evaporates and becomes a vapor in the air
b. Gasoline burns in air when exposed to spark or high heat.
c. After cutting a piece of sodium in air, the surface of the metal changes from a highly shiny surface to a dull gray color

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Based on our data, we think this problem is relevant for Professor Dommer's class at UCSD.