Which one of the following observations would demonstrate that a substance is a mixture? Heating the substance causes it to melt, and then to boil. It cannot be separated into simpler substances by physical or chemical methods. It can be separated into simpler substances by physical methods. It cannot be separated into simpler substances by physical methods, but it can be separated into simpler substances by chemical methods.
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Which one of the following observations would demonstrate that a substance is a mixture? Heating the...
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