Friday, February 4, 2011

February 4, 2011 - Isabelle Cheng - Lab 5B - Types of Chemical Reactions

Isabelle Cheng
Block 2-2 Chemistry 11
February 4, 2011
Ms. Chen
Lab 5B - Types of Chemical Reactions
In this lab, there are four different kind of reactions. Synthesis, decomposition, single replacement, and double replacement. Synthesis has the formula of A+B --> AB and the decomposition has the formula of AB ----> A + B. The single replacement is AB+X----> A + XB. Double replacement’s formula is AB + XY ----> AY + XB. In the lab, we have to identify which reaction is either synthesis, decomposition, single replacement, or double replacement. 
In the lab, my partner and I got different equipment such as a lab burner, test tubes, test-tube clamp and the different substances to experiment with. The substances are copper wire, iron nail, copper (II) sulfate solution, solid copper (II) sulfate pentahydrate, water, calcium chloride solution, sodium carbonate solution, mossy zinc, and other materials.
There were 7 reactions and they each had different substances in the test tubes. The first one is holding the crucible and burning the copper wire. The wire then turns into a silver color. After that when you hold it for a longer period of time it gets more burnt. The second reaction is we had to clean the iron nail with a piece of steel wool until it was shiny. After we placed it in the copper (II) sulfate solution so that half of the nail was covered. We had to wait for 15 minutes. While doing that we moved onto reaction 3. The third reaction we put solid copper(II) sulfate pentahydrate in the test tube until it was one third full. Then we put it over the flame and slowly moved it in all directions. Reaction 4 was to put 2-3 drops of water into Reaction 3 when it was cooled. Reaction 5 was requesting us to fill a test tube of one quarter of the tube with calcium chloride solution and same as sodium carbonate solution. For reaction 6 we took a piece of mossy zinc in a test tube and put some hydrochloric acid solution to mix it in with the zinc. After doing that Reaction 7 we fill up the tube half full for hydrogen peroxide solution. We also add a small amount o manganese (IV) oxide. We then test the gas and wait until the test tube starts bubbling and glowing. In the end, the lab had interesting before and after effects. 

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