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When we did the plastic lab you have to determine which of the mystery plastics float or sink. Then depending on which ones sink or float you follow the chart to see which

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Ways to help a substance dissolve:
-Warming the liquid
~Warming it with your         hands.
~Heating up the liquid with a Bunson Burner
-Stirring
There are also other ways to make a substance dissolve like switching the solvents; instead of water it could be alcohol.
Some substances will not dissolve in water so try to dissolve them in alcohol. Alcohol is another good solvent to try to discover what a mystery substance is because it it may or may not dissolve in water so trying to see if the substance dissolves in alcohol will help in finding what the substance is.

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Volume is how much space a substance takes up. A volume of a liquid can be found by using a graduated cylinder and how much ml the liquid is. If you are finding the volume of a solid there are two ways where you use a formula or you put the object into a graduated cylinder with water.

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Density is

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Boiling point is when a liquid substance is heated to a certain temperature at which the liquid starts vaporizing into a gas.

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When you put a substance in a capillary tube and put it in water you can see what temperature it melts at a certain temperature.