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Reaction of cooper with nitric acid and dill

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tube, dill(green plant),

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Cu+HNO₃

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We had the cooper in the tube, so we had put the nitric acid, only there drops, and we had introduced the dill on to the tube.
In a moment thid had done reaccion, and the liquid started to change the color. The dill start to chance it green color for a brown color, it's like the nitrogen dioxido reacts with it and this die. It smells very bad, and the tube turno on to yellow, and it's hot
CHEMICAL REACTION:
Cu + 4HNO₃ --> Cu(NO₃)₂ + 2H₂O + 2NO₂

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https://drive.google.com/file/d/0B5LeWDEILDWEZE5JeVhxbzMwNWM/view?usp=sharing

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Chemical formula of gas: NO₂
Name of gas: Nitrogen Dioxide
Gas characteristics: The gas seems reddish and brown. The gas is really toxic

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Martyna
Violeta Granado
Matylda
Sandra Falcón
Emre Baş