Empire of Electricity SADAF

Empire of Electricity SADAF - Sadaf Ayaz Chem 106 Empire of...

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Sadaf Ayaz Chem 106 Empire of Electricity Partners: Natalia and Gabby TA: Edmund Tam
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Part One Observations of all substances: Zinc metal Strips: thin metallic grey Zinc nails: silver color M Zinc Sulfate: clear, water-like Copper Metal Strips: orange/brown, metallic, thin Copper Nails Orange: orange/brown metallic M Copper Sulfate: blue liquid Iron Metal Strip: thin metallic grey M Iron Sulfate: dark blue solution Magnesium metal strips: gray, thin metal strips M magnesium nitrate: Carbon Rod: dark grey round stick 0.2 M Potassium Nitrate: clear, water-like pH 4 Buffer: water-like Observations of temperature and voltage for setups 1-4 Setup #1 Trial 2 Trial 3 Trial 1 Set up #2 Trial Temperature Voltage 1 25.7 1.02 2 25.7 1.02 3 25.9 1.07 Temperature Voltage 26.0 0.20 26.3 0.13 26.9 0.14 27.0 0.22 Temperature Voltage 26.0 0.20 26.3 0.13 26.9 0.14 27.0 0.22 Temperature Voltage 25.8 0.22 27.6 0.14 27.8 0.18
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Setup #3 Trial Voltage Temperature 1 1.08 24.1 2 1.07 24.2 3 1.07 24.2 Setup #4 Focus Question: 1) Compare and contrast Setups 1-4 Setup #1: Zinc and copper are in the same beaker Beaker #1: 30 mL of the 1.0 copper sulfate + 1 gram granular zinc metal Setup #2: Zinc and copper in separate beakers but connected by a bridge Beaker #1: 15 mL of zinc sulfate + zinc metal strip Beaker #2: 15 mL of copper sulfate + copper metal strip WITH a u-tube filled with potassium nitrate (KNO3) Setup #3: Zinc and copper in separate beakers without a bridge Beaker #1: 15 mL of zinc sulfate + zinc metal strip Beaker #2: 15 mL of copper sulfate + copper metal strip WITHUT a u-tube filled with potassium nitrate (KNO3) Setup #4: Zinc and copper in a porous cup All 4 setups were different in their own way. Each measured how voltage would change in different conditions. The first experiment, zinc and copper, are in the same beaker and therefore the ion flow was not very efficient. The second experiment had two compounds in different beakers and a salt bridge connecting them best aided the ion flow. The third experiment where the voltage was zero since we removed the salt bridge performed the ion carrying. The fourth experiment showed that the porous cup does carry out some ion transport but not as well as the salt bridge. Trial Voltage Zinc Temperature Copper Temperature 1 1.07 24.7 23.9 2 1.07 25 23.8
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2) Which setup or setups is the most useful and how does it function in a useful way? Describe the chemistry involved (i.e. half reactions)?
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