Physical and Chemical Change Lab Essay

Test the effect of a magnet on each substance by passing the magnet under the paper. Test the solubility of each substance by mixing small amounts in a separate test tube with 3mL of distilled water in it, then â€Å"flick† each tube to mix the contents. Return strip of magnesium in test tube to its paper. Follow teacher’s instructions for paper disposal of other materials. -Part B: Record all observations of Part B in Data Table 2 6. Mix iron filings and sulfur on clean paper. Examine mixture with magnifying class. Test effect of magnet. Give this mixture to teacher for further use in Part C. 7. Mix sodium chloride and sand on clean paper. Examine mixture with magnifying glass and test effect of magnet. 8. Transfer salt-sand mixture into 100mL beaker, then add 30mL of water and stir. Record observations, and then prepare for filtration setup. Filter the mixture and record observations. Pour 10mL of filtrate into evaporating dish, then prepare burner to heat evaporating dish. Heat dish till filtrate is completely evaporated. Examine both dry residue in dish and wet residue on filter paper. Caution: Do not look directly at burning magnesium. Using tongs pick up the magnesium and hold it over the burner till it ignites. After ignition quickly put burning magnesium over watch glass to catch falling combustion product. Compare original and burnt magnesium products appearance. 10. Put the normal magnesium and combustion product into separate test tubes. Add 10 drops of 6M hydrochloric acid to each test tube. Feel the bottom of each test tube and record your answer. 11. Put half of the sucrose sample into a test tube. Caution: Be sure tube is cool before handling it. After test tube is cool, use a spatula to scrape residue and clean test tube. Examine residue and test its solubility in water. Transfer sodium hydrogen carbonate sample to test tube. Add 5 drops of 6M hydrochloric acid. Touch tube at bottom with hand and record observation. Follow teacher’s instruction for proper disposal of materials. -Part C: Record all observations for Part C in Data Table Samples of the iron-sulfur mixture from Part B will be put into a clean test tube. The mass of the test tube and its contents will be determined and recorded.