If a piece of matter has no visible boundaries then it is a pure substance.
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Q44: Matter is classified into substances and mixtures.
Explain
Q45: A substance may be heterogeneous or homogeneous.
Q46: Air is a substance.
Q47: A mixture may be heterogeneous or homogeneous.
Q48: A liquid has a definite shape and
Q50: Elements and compounds are the two types
Q51: Explain what chemistry is.
Q52: Define solid,liquid,and gas.
Explain the differences in the
Q53: Name four different ways in which you
Q54: Mixtures can be separated by the differences
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