Question on: JAMB Chemistry - 1989
Which of the following would support the conclusion that a solid sample is a mixture?
A
the solid can be ground to a fine powder
B
the density of the solid is 2.25 g dm3
C
the solid has a melting range of 300oC to 375oC
D
the solid absorbs moisture from the atmosphere
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Correct Option: C
A mixture is a substance that contains two or more components that are not chemically bonded. One way to identify a mixture is by its melting behavior. A pure substance has a sharp, distinct melting point, while a mixture usually has a melting range, meaning it melts over a range of temperatures.
- A. Grinding a solid to a fine powder is a physical change that could happen to either a pure substance or a mixture.
- B. Density is a physical property that can be associated with both pure substances and mixtures.
- C. A melting range (300°C to 375°C) indicates that the solid melts over a range of temperatures. This is characteristic of a mixture, not a pure substance.
- D. Absorbing moisture from the atmosphere
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