Salt Iodine Experiment

910 Words 4 Pages
Register to read the introduction… This showed the sand grains more clearly and more defined, as in their shapes and sizes. * When we added a drop of oil on the reaction surface, we observed defined smooth edges. When the drop of water was on the reaction surface, we observed more rough edges. * When we dropped the potassium iodide and the sodium hypochlorite they were both clear before mixing. We observed the chemicals after mixing and it turned to a yellow color with small red dots. This indicated that there was a chemical reaction after mixing the two chemicals. * When we added water to the oil then we added potassium iodide and sodium hypochlorite, the result was a gold center of iodine. This indicated that there was a chemical reaction but the oil had an effect on the iodine that was made.
Conclusions: With this experiment there were several different ideas brought about. We learned the differences of physical and chemical changes and characteristics. We also learned how to observe if a chemical reaction occurred by color change, formation of a solid, and formation of a gas. With the bonus questions, we learned the newspaper, rock salt, sand and the oil and water on plastic was an example of physical change. The iodine in water and oil was an exampleof chemical
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Sharper shiny shards.Wet: Dull looking shards of crystal. Floating then dissolving | c) Appearance of sand | Dry: Tan, orange, brown, tiny, solid. All different shapes and sizes. Wet: Shows grains more clearly and individually. Floating | d) Oil and water on plastic | Oil: More clear, defined smooth edgesWater: rougher edges, surface tension | e) Making iodine in water: potassium iodide (KI), and sodium hypochlorite (bleach, NaClO). | Both chemicals were clear before mixing. After mixing turned to a yellow color. Small red dots in the middle and stained the plastic. Smooth, round mixture.

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