Monday, September 13, 2010

Lab 1-1: Properties of Green Stuff

The procedure pertaining to this lab "Properties of Green Stuff" include two beakers, one filled with 25ml of water and the other to hold the copper (II) chloride. After recording your observations of the dry copper (II) chloride you pour your 25 ml of water into the beaker holding the "green stuff". After stirring the mixture completely make observations of the finished product. Next using the eye dropper place a few drops of this mixture onto the given aluminum foil. After observing the reaction tear the foil into pieces and place it into your mixture. When finished making observations you dispose of your mixture and properly put away you equipments used for the experiment.

Determining whether the properties of the "green stuff" is physical or chemical can be simply stated. A physical change changes the appearance of the substance which can commonly be observed through our senses. A chemical change changes the composition of the substance when it interacts with another substance. For example the copper (II) chloride before mixing it with water was brown, when it touched water the copper (II) chloride turned green ergo "green stuff" this is a physical change. When the "green stuff" was completely mixed with water the mixture caused a chemical reaction turning to copper when reaching the aluminum foil is a change in composition.

In the this lab the water was the liquid the copper (II) chloride was the solid and the reaction of the mixture on aluminum foil was the gas. Solids are compacted particles with little space between like the "green stuff" the liquid (water) has moving particles only confined by its container its kept in. The mixture of these cause an reaction on aluminum causing a gas to rise(spaced out bustling particles in a random state of motion). In class we are learning the different states, properties, and types of matter. This experiment demonstrates this through the different substances used through this lab and its changes. One question was why did the substance change green and the water is blue?

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