ࡱ> []Z5@ Nbjbj22 "VXXN RRRRRRRfNNNNjf'ZZZZZZZZ'''''''$7(R*n&'RZZZZZ&'RRZZ;'Z RZRZ'Z'VX"@RR#ZN @)Nd " l#Q'0'"x*nj*#ffRRRR*R#PZZZZZZZ&'&'ff*$ ff*Periodic Table Lab: Purpose: To investigate the properties of several elements on the periodic table and classify them as metals, non-metals or metalloids. Pre-lab Questions: In you lab notebook, draw the following table. Write each of the following properties under the appropriate heading. Write the whole property, not just the letter of the property. metalsnon-metalsmetalloids good conductor of heat poor conductor of heat (insulator) semi conductor shiny, high luster solids tend to be dull malleable brittle ductile good conductor of electricity poor conductor of electricity Materials: For the observation stations you should prepare sealed test tubes containing the following elements: copper, silicon, magnesium, carbon, nickel, aluminum, zinc, sulfur, oxygen, lead, bismuth, silver, nitrogen, antimony, and hydrogen For the conductivity station, you should have plastic dishes with one piece of each element to be tested and micro-conductivity testers. For the malleability station, have one piece of each element per group along with paper towels and hammers. For the reactivity station, have one piece of each element per group, 9 test tubes, test tube rack and 1 M HCl. Procedure: In your lab notebook, draw a table like the one shown below. Observe the appearance of each of the elements. Record physical state, color, luster and other observable characteristics. Using the micro-conductivity tester, determine whether the elements conduct electricity. If you observe carefully, you might see that some are semi-conductors. To determine which elements are malleable, place a single piece of the element on a paper towel, and gently tap it with a hammer. An element is brittle if it shatters when it is hit. An element is malleable if it flattens when it is tapped. To test the reactivity with 1 M HCl, label 9 test tubes with the symbols for each element. Add 5 ml of the acid to each tube. Then add a small sample (approx 0.1 gram) of each element to the labeled tubes. Formation of bubbles of hydrogen is evidence that a reaction is occurring. (Note: not all reactions are vigorous, so watch closely) ElementAppearanceConductivityMalleabilityReactivity with HCLNon-metal Metal or MetalloidCopperSiliconMagnesiumCarbonNickelAluminumZincSulfurTin For the following elements, try to decide if they are a metal, non-metal or metalloid based on their appearance. ElementAppearanceNon-metal Metal or Metalloidoxygenleadbismuthsilvernitrogenantimonyhydrogen On the blank periodic table, label the elements that we tested in lab. From your observations label them as metal, non-metal or metalloid. Color each group (metals, non-metals and metalloids) a different color. Analyze and conclude: Answer the following questions in your lab notebook. Use summary sentences. Which elements displayed characteristics of metals? Where are the metals located on the periodic table? Which elements displayed characteristics of non-metals? Where are the non-metals located on the periodic table? Which elements displayed some characteristics of metals and some of non-metals? Do metallic characteristics of elements seem to increase from left to right or right to left? 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