Lab 7 CHM130LL Analysis of Copper Ore w answers.pdf - CHM 130 Analysis of Copper Ore for Cu Content Introduction Copper in various forms has been mined

Lab 7 CHM130LL Analysis of Copper Ore w answers.pdf - CHM...

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1 CHM 130 Analysis of Copper Ore for Cu Content Introduction: Copper, in various forms, has been mined from the Earth ever since mankind started using metal tools. Early Egyptian civilizations used bronze, an alloy of copper and tin, to make tools, weapons, and jewelry. Surface ore supplies were used up quickly and deeper ore deposits needed to be mined in order to access additional copper ores. Today, rich copper deposits are rare and deposits of native copper (pure copper metal) are very scarce. Most ores mined today are made of compounds that contain less than 1% copper. Mining the ore out of the ground is not complicated, but extracting the copper metal from the ore can be. Most ores are compounds of sulfides, carbonates, or silicates, and the metals can be extracted using the chemical properties of these compounds. Most copper ores are carbonates and so the chemical reaction of carbonates and acid can be used to dissolve the ore. Once the ore is dissolved, then the copper can be removed from the solution using a more active metal or by passing electricity through the solution. Many reactions are accompanied by an energy change. Energy can take the form of heat or light. If a reaction releases thermal energy it is called exothermic . Exothermic reactions cause their surroundings to feel warm to the touch. The thermal energy released by the reaction is absorbed by the surroundings (water, beaker, etc) and the temperature goes up. If a reaction absorbs thermal energy it is called endothermic . Endothermic reactions cause their surroundings to feel cold to the touch. The thermal energy absorbed by the reaction is taken from the surroundings (water, beaker, etc) and the temperature goes down. In this lab you will use aluminum, a more active metal than copper, to precipitate copper metal from solution. unbalanced equation: Al (s) + CuCl 2 (aq) AlCl 3 (aq) + Cu (s) You will analyze the amount of copper extracted from two different types of copper ore, azurite and malachite. From the data you collect you will be able to determine the weight percent of copper in each of the ores.
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  • Fall '19
  • Chemical reaction, Copper Ore

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