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Chemistry Lab

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Introduction

Physical & Chemical Porperties of two Metals ( Mg & Cu) Physical and Chemical Properties of two Metals (Mg & Cu) " Design Design Purpose The purpose of this lab is to examine the physical and chemical properties of Magnesium and Copper. Definitions: Chemical change: A chemical change is a kind of change in which a specific type of matter is converted to a new one. Physical change: Physical changes are those in which a change in the form, but not the composition of matter occurs. Physical property: Physical properties can be observed or measured without changing the composition of matter, they are generally used to observe and describe matter. Chemical property: Chemical properties can not be determined unless a substance undergoes a change in its composition. If you answer the question "Can I get the original substance back?" with no, then you are observing chemical properties. Physical and Chemical Properties of two Metals (Mg & Cu) " Data Collection Data Collection Observations for Magnesium: Process Observations a) ...read more.

Middle

Attempt to bend a piece of copper wire. Does not break easily c) Obtain two 3 cm pieces of copper wire. Clean the surface of each with a piece of steel wool. Bronze in color, shiny and very smooth d) Place one of the pieces of copper wire from part c) into a test tube containing 3 mL of water. Add two drops of phenolphthalein solution and shake for 30 seconds. Liquid turned cloudy/white e) Using crucible tongs, hold the other piece of copper wire in a burner flame to ignite the copper. Remove the burning copper from the flame and allow it to continue to burn. Save the ignition for part f) Got warm, color of liquid turned grey, copper wire bends easily f) Place the ignition product from part e) into a test tube containing 3 mL of water. Add 2 drops of Phenolphtalein and shake for 30 seconds. No changes observed Add a 1 cm piece of copper wire to a test tube containing 1 mL of 2.0 mol/L HCL and observe for 30 seconds. ...read more.

Conclusion

Evaluation This experiment showed very well how different copper and magnesium react by doing several similar experiments with each of them, but I think there is a lot of room for improvement because I am quite sure that there are either changes or specific properties occuring in parts G to I with the copper. The fact that no reaction took place might have been due to not enough liquid for those experiments, it might have been helpful to either add more or do several trails with each one having a different value of liquid in it. In general it is always better to have numerous trails, this would give us better evidence about changes which might not have been regular, but occured due to unpreciseness when doing the experiments. It might have also been interesting to measure the temperature of the boiling liquid, whether or not there is a difference between the reaction with copper and magnesium or not. We only had about 40 minutes to complete our entire experiment, which was, in my oppinion, not enough time to complete all steps properly with a high preciseness, more time would have been helpful, too. ...read more.

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