Next, our science class did a lab about carbon dioxide and fire. To make the carbon dioxide we mixed vinegar and baking soda together. This made the substance to fizz. The new substance we made was a chemical change. We took the beaker holding the carbon dioxide mixture and held it over a flaming candle. This caused the flame to go out. The reason this happened was because fire is not supported by carbon dioxide. After that, we did a lab about marshmallows. Each person got one small marshmallow and one big marshmallow. The first thing we did was rip the small marshmallow in half. This was a physical change because the appearance of the marshmallow changed. Next, we put the big marshmallow over the Bunsen burner and burned them a little bit. This was a chemical change. The burned part of the marshmallow tasted bitter and burned. The rest of the marshmallow was sweet and fluffy.
The last lab we did also showed many examples of physical and chemical changes. In the beginning of the lab we had to crush up sugar cubes. This was a physical change because the size of the sugar cubes changed. Then, we took the crushed sugar and mixed it in with a glass of water. This was also a physical change because the sugar just dissolved. The last part of this lab was burning the sugar. Because the sugar was being burned, it was a chemical change. All of these labs showed many examples of physical and chemical changes. The skills I learned during these labs can help me in my life. For instance, I can use physical and chemical properties to describe different things.
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