Editing revision 1 of Additional Steps In Physical And Chemical Change Lab - Revised 2022-2023

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These are additional experimental steps/stations to the [[Physical and Chemical Change Lab]]. 
 
 
As with the rest of this lab, you will make observation BEFORE, DURING, and AFTER change has occurred. 
 
 
Step A 
 
1) Obtain a clean test tube (so also test tube holder and rack). 
2) Add DI water to about 1/3 of the volume of the test tube and make observations. 
3) Add a small amount of Copper (II) sulfate solid to the water. Make observation of solid before adding to water. 
4) Dissolve as much as the solid as possible with just shaking the test tube (not all solid will dissolve right away, so you will not a "true solution" but that is Ok.). Record observation of solution. 
5) Add 5 drops of the Barium chloride solution (after observing solution) to the test tube. Make observations. 
6) Wait two to three minutes to let settle out. Observation both solids and liquid (actually a solution). It is ok to go to next step even if there is some of the solid that has not settle out. 
 
7) Observe the sodium carbonate solution before adding 20 drops or more of this solution to the test tube. 
 
8) Let settle and make observations of the solid and the liquid (again actually a solution maybe not though). 
 
Step B 
 
1) Make observations of a piece of Magnesium (Mg) ribbon. 
2) Place Mg ribbon on the crucible tongs and expose ribbon to flame (need to make sure you use tip of inside flame). 
3) As the change is occurring, put the Mg ribbon over an evaporating dish to collect the product(s). 
4) Make observation of the change and products after. 
 
 
Step C 
 
Teacher will demonstrate difference between solution, colloid and suspension so you will be putting direction, observation directly into your notebook.

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