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A student checks the volume, melting point, and shape of two unlabeled samples of matter and finds that the measurements are identical. He concludes that the samples have the same chemical composition. Is this a valid conclusion? What additional information might be collected to test this conclusion?
Write on a separate sheet of paper the letter of the correct answer. Which of the following statements about compounds is true? F. A compound contains only one element. G. A compound can be classified as either heterogeneous or homogeneous. H. A compound has a defined ratio by mass of the elements that it contains. I. A compound varies in chemical composition depending on the sample size.
Describe the physical and chemical changes that occur when a pot of water is boiled over a campfire.
A physical change is is the conversion of liquid water to vapor.
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