In the first experiment, it showed an example of combustion. My hypothesis stated that when the flame was put close to the bottle, the bottle would actually catch on fire. My prediction was wrong. A 2-liter bottle was filled with ethenol. The liquid was then emptied, but the gas was kept in the bottle. Then a flame was put close to it. Once the flame was exposed to the gases of the bottle, the bottle flew off the table.
The second experiment showed an example double displacement. In my hypothesis, I stated that if vinegar was mixed with the baking soda, and the gas would be put over a flame, then the flame would cause the mixture of vinegar and baking soda to bubble up even more, because there would be more energy. However, what really happened was when the gas of the baking soda and vinegar mixture was placed over the flame, the flame blew out. This happened because the flame needed oxygen to “live,” however the flame was engulfed with the gases produced from the mixture, causing it to go out. The molecules around the flame area changed, which caused the flame to burn out.
In the third experiment, it showed an example of single displacement. In my hypothesis, I predicted that when the iron would be put into the water, and lit on fire, it would start to bubble. My hypothesis was correct, but the iron also caused the water to change color, and the iron started to dissolve. The bonds of the hydrogen and chlorine broke, making it single displacement.
The last experiment also showed an example of combustion. I stated, in my hypothesis, that when the hydrogen peroxide and soap was mixed with the potassium iodide the mixture would start to bubble. My hypothesis was incorrect. What really happened was that the mixture started to foam up very quickly. It also produced a lot of heat. When a hand was placed over the foam, the person could feel the heat rising from the foam. The reason this is combustion is because there was heat released.
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