A(n) ________ is also known as measurement involves a number and a unit.
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pure substance
When a mixture contains several volatile components, the one- step distillation does not give a(n) ________ in the receiving flasks, and more elaborate methods are required.
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possible explanation
A hypothesis is a(n) ________ for an observation.
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mixture
When a(n) ________ is separated, the absolute purity of the separated components is an ideal.
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Theories
________ are human inventions that represent attempts to explain observed natural behavior.
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