7. Marlyn heated an unknown solid material. After few seconds, the material started to melt at 35 °C and finishes melting at 40 °C. What is the characteristic of the material?
A. The material is a pure substance.
C. The material is a mixture.
B. The material is a non-metal.
D. The material is a metal.
A. The material is a pure substance.
C. The material is a mixture.
B. The material is a non-metal.
D. The material is a metal.
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Answer:
A.The material is pure substance