Essay on Labpaq Exp 6

720 WordsNov 11, 20133 Pages
Title: Physical and Chemical Properties Purpose: The purpose of this experiment is to investigate the physical and chemical properties of pure chemical substances by subjecting them to various environmental extremes. Procedure: Filled each test tube with substances provided and subjected them to various conditions. These conditions included, heat, cold water, hot water, acid and basic additions and tested on litmus paper. The reactions were observed and documented at each step. Data tables: Substance name Color Odor Effect of heat Cold H2O Hot H2O Litmus Test Dilute HCl Dilute NaOH Mg Small silver, metallic, shards No smell Shriveled up and turned white. Produced gas insoluble Boiled fast, some sample floated to top…show more content…
Most notably the reaction with heat and hot and cold liquid were interesting. Several attempts were made to obtain a smell from the reactions but none were found. When the samples were heated in water several of them had violent and/or sudden reactions. Questions: A. Yes, an example would be Mg being heated. B. The fact that it created a new substance, in this case a gas. C. The first is as stated above, Mg when heated created a gas and the second is when HCl was added to MgO, it changed color and was endothermic. D. Silver metallic color: Physical Turns gray in air: Chemical Melts @ 98 DegC: Physical Reacts explosively with chlorine gas: Chemical E. Water freezes at 0degC: Physical Baking and vinegar produces bubbles: Chemical Moth Balls disappear at room temp: Physical Ice cube in freezer smaller with time: Physical Baking soda loses mass when heated: Physical Silver tarnishing: Chemical F. After dissolving the NaC in the water, you could evaporate the water and show that you get NaCl back. If you

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