Exp 5c Types of Chemical Reactions

Exp 5c Types of Chemical Reactions - Chemistry 11 Lab Types...

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Chemistry 11 (April 5, 2008) Lab: Types of Chemical Reactions Page 1 Lab #5C: Types of Chemical Reactions O BJECTIVES To observe a variety of chemical reactions To interpret and explain observations with balanced chemical equations To classify each reaction as one of the four main types H AZARDS Most of these solutions are poisonous, corrosive, or irritants. When handling these solutions, wear goggles, force shield, laboratory apron, and plastic gloves. Wash any spills and splashes immediately with plenty of water. Call teacher. M ATERIALS See handout “Types of Chemical Reaction”. (Pg. 71) P ROCEDURE See handout “Types of Chemical Reaction”. (Pg. 71) D ATA AND O BSERVATIONS R EACTION 1 Observations Initially, the bare copper wire was brown. When heated, the copper wire reacted with oxygen from air, forming a coating. On the various heated spots on the wire, the brown coating on the copper wire turned black/orange and white. The final resultant was black. What’s happening The copper oxidized faster when heated than when held in the air at room temperature. The copper metal reacted readily with oxygen from air when heated strongly, forming a coating of black copper oxide, CuO. This experiment demonstrated the conductivity of copper. Six (6) cm of bare copper wire was heated in the hottest part of the flame for a few minutes.
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Chemistry 11 (April 5, 2008) Lab: Types of Chemical Reactions Page 2 R EACTION 2 Observations Initially, the nail was a shiny silver color and the copper sulfate solution was blue. When the nail was placed in the copper sulfate solution, a reddish (rust like color) layer soon appeared on the iron nail. This reddish substance coats the nail up to the point at which the nail was immersed in the solution. There was a new reddish residue in the solution. What’s happening The reddish substance on the nail was copper.
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