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9.A white powder wastasted and heated. After some time,it melts compleatly.What does it mean?
A. it is a mixture
B. it is a pure substance
C. it is a homogeneou mixture
D. it is a combination of pure substance and mixture

10.which of the following statements distinguishes pure substance from mixtures?
A.can be separated by physical means
B.consists of two or more kinds of matter
C.have no peace accessibility and densities
D.have constant boiling temperature and melting​