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Physical and Chemical Properties/Changes of several household chemicals

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LAB: #1 DATE: 11th September, 2007 TITLE: Physical and Chemical Properties/Changes OBJECTIVES: 1.To observe the physical and chemical properties of several substances. 2. To decide whether certain observed changes are physical or chemical. 3. To experience several methods of separating mixtures. MATERIALS: 1. ring stand, ring, gauze 12. Bar Magnet 2. burner 13. Distilled water 3. stirring rod 14. Table sugar (sucrose) 4. magnesium ribbon 15. 100 mL beaker 5. Table salt (sodium chloride) 16. 250 mL beaker 6. spatula 17. sand 7. baking soda (sodium hydrogen carbonate) 18. evaporating dish 8. filter paper, funnel 19. vinegar 9. Silver Nitrate 20. test tube holder 10. Iron and Sulphur 21. 3 test tubes/ rack 11. lab coat and goggles 22. 6 M hydrochloric acid PROCEDURES: A. The Physical Properties of Matter Obtain samples of the following compounds and record in your data section their physical states, colors and odors 9WAFT their odors to your nose-don't inhale directly above the sample): Name Chemical Formula Table Salt NaCl Baking Soda NaHCO3 Sucrose C12H22O11 Sand SiO2 Magnesium Mg Vinegar HC2H3O2(aq) B. Physical and Chemical Changes 1. Approximately 20ml vinegar was obtained in a 150 mL beaker. ...read more.


-brown color -large and small particle sizes - moist -grain-like composition Salt (solute) -white color -tiny particle sizes -particles sticked together to form crust -dry -crystal-like composition COMPARISON OF SALT SOLUTE AND SAND RESIDUE Compound Condition Change Silver Nitrate Dark (locker) None Silver Nitrate Exposed to light -turned copper brown color -black edges around brown -paper was dry REACTIONS OF SILVER NITRATE IN LIGHT AND DARK CONDITIONS Compounds Change after grinding Change with magnet Iron filings and Sulphur powder - poweders mix together - turns olive green color - iron filings attract to magnet - sulphur poweder remains unchanged OBSERVATIONS OF IRON FILINGS AND SULPHUR POWDER AFTER GRINDING AND MAGNET ATTRACTION DISCUSSION: In this lab the physical and chemical properties of given substances were investigated along with the determination of chemical/physical changes observed in certain mixtures. Separating methods were also used to separate certain mixtures. As a result, these three objectives were completed successfully. In the first experiment, a 2cm magnesium ribbon was added to 4ml 3M of hydrochloric acid. The resulting reaction caused the mixture to fizz and dissolved the magnesium strip. This was found to be a chemical change due tot eh fact that an acid (HCl) ...read more.


The first reaction with baking soda and vinegar was a chemical change due to the fact that the solution fizzed forming a new one and gas evolved thus outing the splint. The second reaction of HCl and Mg was chemical as well because magnesium dissolved and hydrogen gas evolved (both results of a chemical reaction between magnesium and HCl). The third conclusion drawn was the fact that sucrose mixed with water was a physical change. This was so because even though the sucrose dissolved it did not change chemically and could have been separated from the water back to its original form; moreover, when sucrose was heated it was another physical change as it changed state but remained the same compound, sucrose. Physical changes were also observed in the sand, salt and water mixture. The salt was ultimately extracted from the water through evaporation proving it was a physical change. After this, when the silver nitrate was placed in the sunlight a chemical change occurred as light reacted with silver ions thus changing the color of silver nitrate. Lastly, a final physical change was observed in the grinding of iron filings and sulphur powder because when the magnet attracted iron filings it showed that the iron did not change its identity but only mixed in with the sulphur powder. ?? ?? ?? ?? Anuar Flores CHE 124-1 ...read more.

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