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 …show more content…
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.