ࡱ;   R FCompObj\WordDocument0ObjectPoolb`b`  FMicrosoft Word 6.0 DocumentNB6WWord.Document.6;  Oh+'0  ) 5AI Q]z =Science F:Microsoft Office:Microsoft Word 6:Templates:NormalLAB: TITLE OF LABsciencescience'@@1z@reܥhO e 0 *******4V+V+V+V+V+n+ x+V+/e++++++++.//////&0Xj03/*++@+++/+**++++++*+*+.+ +6****+.+2+Lab: The Formula of a Compound  Introduction The formulation of the Avogadro Hypothesis and the subsequent definition of a mole allowed chemists to determine chemical formulae. The chemical formula of a compound reflects the mole ratio of the atoms combined in that compound. In this experiment you will make a compound from magnesium and oxygen and determine the simplest chemical formula of that compound. MATERIALS: crucible and cover clay triangle ringstand bunsen burner iron ring magnesium medicine dropper Procedure 1. Obtain a clean , dry crucible. Determine and record its mass. 2. Obtain a 30 cm piece of magnesium ribbon. If the surface of the ribbon is not bright, scrape off all the adhering film with fine steel wool. Cut or tear the magnesium in to 1.0 cm pieces and add them to the crucible. 3. Determine the mass of the crucible and the magnesium. Record this mass. (DO NOT MASS THE COVER.) 4. Set up the heating apparatus shown below. Heat the crucible gently for a minute or two, then strongly for 3 or 4 minutes. Call your teacher over at this point. 5. The teacher will check the contents and tilt the cover using the crucible tongs. Continue heating the partially covered crucible for an additional 7 - 10 minutes. 6. Discontinue heating.j Allow the crucible to cool to room temperature. Inspect the contents of the crucible at this point. If it is obvious that there is unreacted magnesium in the crucible, it will be necessary to heat the crucible again before proceeding. 7. Using a medicine dropper, add only enough distilled water to the crucible to cover the mixed product content. Heat the system uncovered, carefully. (Observe the odor of any vapor that may form.) . 8. When the water has evaporated, allow the crucible and the compound to cool to room temperature. 9. Mass the crucible and the product. Record this mass. Data DATA TABLE MASS OF EMPTY CRUCIBLE  MASS OF CRUCIBLE AND MAGNESIUM  MASS OF CRUCIBLE AND PRODUCT  Calculations 1. Determine the mass of magnesium that reacted. 2. Determine the moles of magnesium that reacted. 3. Determine the mass of oxygen that reacted. 4. Determine the moles of oxygen that reacted. 5. Determine the simple, whole number mole ratio of magnesium to oxygen. 6. What is the formula for this magnesium/oxygen compound? Analysis 1. Look at the class data. What is the formula for magnesium/oxide? 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