Physical and Chemical Changes - 1253 Words

Title: Physical and Chemical Changes Purpose: Recognize and distinguish between chemical and physical changes Apparatus and Material: evaporating dish, Bunsen burner, wood splint, test tubes, micro spatula, dropper, mortar and pestle, test tube holder, safety goggles, lab apron. Piece of paper, NaCl (sodium chloride), water, 6 M HCL (hydrochloric acid), 0.1 M AgNO3 (silver nitrate), Mg ribbon, 6 M HCL (hydrochloric acid), CuSO4 5 H2O, 0.50g iron fillings, 0.50g of powdered sulfur, magnet, copper sulfate solution, zinc metal Safety: When heating a substance in a test tube, be sure the open end of the test tube points away from yourself and others. Handle all acids with extra caution. Always wear safety goggles when handling acids.†¦show more content†¦Heated crystals change color from blue to white; water vapor forms on the walls of the test tube. Addition of water turns the heated crystals from white back to dark-blue, almost teal color. 5. Sulfur appears as yellow powder; iron is dark-brown powder; mixed together, they look like dirt. Iron becomes attracted to the magnet, following it if it’s close enough; sulfur does not. Magnet can be used to separate the two mixtures. 6. On heating the iron-sulfur mixture, the sulfur melts and reacts with the iron exothermically to first evaporate into a yellow gas, then form a reddish-orange, solidified substance that â€Å"glows†. The substance releases an unpleasant odor of rotten eggs. The iron on the bottom turns black and does not react with a magnet. The glowing substance turns out to be a soft solid when probed. 7. Zinc is a silver solid with a light mass. Addition of zinc metal to copper sulfate solution results in an exothermic reaction that produces a brown-reddish precipitate (copper). Zinc becomes coated with the copper precipitate, thus becoming dark. Conclusions and data: 1. a) tearing paper – physical change; retaining of properties, no new substances created b) burning paper – chemical change, gas and heat given off (evidence of chemical reaction) c) dissolving NaCl – physical change; solution formed, but individual properties retained; separation possible by distillation. d) mixing NaCl and AgNO3 - chemical change; white precipitate, orShow MoreRelatedPhysical and Chemical Changes Essay758 Words   |  4 PagesShelby Brown 8/28/10 Physical and chemical changes lab essay Changes in matter occur every day. There are two types of ways matter can be altered; physically and chemically. Physical changes do not change the composition of the matter while chemical changes occur when one or more substances turn into a completely new substance. Physical changes can be seen through an altering of the substances physical property. 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