Chemistry

Data/ Observations

Data:
· Measurements:
- Paper towel = 0.5100 g
- Cu + Paper towel = 1.1000 g
- HNO3 = 5.01 mL
- H2O = 100 mL
- NaOH = 30.001 mL
- Wax Plate = 2.291 g
- Zn + Wax Plate = 4.693 g
- Zn = 2.402 g
- Methanol = 5.19 mL
- Acetone = 5.30 mL
- End Product Cu + Wax Plate = 2.970 g
- End Product Cu = 0.679 g

Observations:
· The copper at the beginning was a light reddish and powdery solid.
· When the HNO3 was added, the liquid   turned green and produced an orange gas (NO2 (g)).   There was a grainy substance on the bottom.   There was no change in temperature.
· When the NO2 was gone, the solution still smoked.
· When we added the water, the solution went from a green to a very crystal, pretty blue.   The substance stopped smoking and the grainy substance at the bottom went away, it dissolved.   There was no change in temperature.
· After the NaOH was added, the solution turned a more vibrant and bright blue and had almost a jelly look to it.   The jelly looked sort of like the lava in lava lamps because it was in small liquid/solid balls smooshed together.
· When the blue, jelly substance stayed out for a while, it turned a little whitish at the top.   Still no change in temperature.
· When the substance began to boil, it turned very black and grainy.   The liquid was separate than the solid.   It looked like dirt on the bottom of a lake or some body of water.
· After we added the H2SO4, the liquid turned light blue again and the solids now float to the top.   There did not seem to be as much solid as there was before.
· When we added the Zn, the liquid turned brown and it sort of looked like hot chocolate.   The "dirt" looking solid and the extra zinc stayed on the bottom of the beaker.   The excess zinc kept bubbling, until it finally went away all together.   This reaction actually changed in temperature.   The beaker was very warm after it all denoting that the reaction was exothermic.
· The last product of copper was a dark reddish... [continues]

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