3 A student adds a few crystals of a solid to 3 mL of ethanol in a bat tube and
ID: 844246 • Letter: 3
Question
3 A student adds a few crystals of a solid to 3 mL of ethanol in a bat tube and then allows the test tube to remain undisturbed for 5 minutes. The student then observes that the crystals have not dissolved and concludes that the solid is insoluble in ethanol. Is this a valid conclusion? Why or why not? 4. In determining the melting point of an unknown solid a sample of the solid is heated at instead of the recommended. Will this have any effect on the melting point determination? 5, Should the straight line drawn on the mass vs. volume graph used to determine the density of aluminum intersect the origin of the graph? Why or why not?Explanation / Answer
3.No it is not a valid conclusion the sample should be agitated.
4. yes the sample may decompose.
5. The graph should pass through zero. Since anything with zero mass cannot have volume and any thing with zero volume cannot have mass.
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