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Lab Report

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Submitted By LuisMartinez1
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Pages 3
Luis Martinez
Mr.Kronk
Honors Chemistry Bell 1
29 August 2015
Lakota West Lab

Purpose The purpose of this lab is to identify physical and chemical changes and differentiate between the two.
Procedure
Procedure is found on the Physical and Chemical Changes lab at Lakota West lab. Use plastic pipets. On #4 change the experiment to mixing 5 mL of NaCl with 2-3 drops of silver nitrate. On #9 replace regular test tube with a disposable one. Omit the last experiment.
Materials
Disposable Test Tubes Magnet
Test Tubes Paper towels
Plastic Pipets Beakers
Bunsen burner Rubber Policeman
Splint (for burning) Test Tube rack
Tongs
Safety Don’t stare at burning magnesium. On # 9 have beaker of water ready prior to burning mixture, also when plunging mixture in the water submerge the entire test tube.

Data Table
Experiment Observations 1 | Wax melted yellow and cooled yellow. | 2 | Formed a white precipitate floating on top. | 3 | Forms a milky, chunky mixture. | 4 | Tiny “poof” noise. | 5 | Burns an extremely bright white light. | 6 | Turned the powder white and produced smoke, water turned it back to blue. | 7 | Turned white and mixture dropped in temperature. | 8 | Pulled the iron out of the mixture. | 9 | Not magnetic pull. |

Conclusion The purpose of the lab was achieved because physical and chemical changes were both identified and differentiated. A possible source of error was on #4 the reaction could have ended before the burning splint was introduced. Having a flame above the test tube continuously might fix that problem. On #9 the iron sulfur mixture might have been too hot or not hot enough. Have thermometer on the test tube while it’s being heated up. 1. Define chemical and physical change.
A chemical change is a change that changes the composition of a substance. A physical change alters a...

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