Title: Chemical and Physical Changes. Purpose: To determine the differences between chemical and physical changes when they happen. Materials: Five test tubes, Bunsen burner, crucible, test tube holder, triple beam balance, ring stand, triangle, evaporation dish, wood splint, copper turnings, copper (II) nitrate, dilute nitric acid, Ba(NO3)2, Na2CrO4, FeCl3, KSCN, AgNO3, ammonium dichromate, safety goggles, and matches. Results: 1. Data table (see attached page) 1. A chemical change usually foams, sparks, explodes or lets off gas, and it changes the substance into a compound. A physical change will change color, melt or evaporate but it will not change the substance . 2. A physical change that seems like a chemical change is when I poured the FeCl3, and KSCN together because they were both clear but together they turned red. 3. A chemical property is if a chemical or element has a reaction with another chemical, element or heat. A chemical change is the reaction the two or more substances have together to create a new compound. Conclusion: In this lab, we conducted many experiments to see if chemicals and elements have a reaction together. We were to determine if the reaction was chemical or physical change. We were supposed to give examples to why they were chemical or physical changes. Most of the chemical combinations led to a chemical change. I think the best example of a chemical change was the ammonium dichromate experiment, because it showed the most examples of change.
The Essay on Chemical Properties Pure Substance
Mixtures and pure substances - Pure substances are matter made up of only one type of atom or molecule - Mixtures are a collection of 2 or more pure substances physically mixed together that cannot be represented by a chemical formula. - A mixtures properties may vary, because the proportions of the substances in them may vary. Gold for example is too soft to maintain it's shape in jewelry so ...
