Chemistry, 31.07.2019 13:40 lbelle

Simon has collected three samples from the coral reef where he observes marine life. he must determine whether each one is a pure substance or a mixture. sample a : clear liquid. evaporates at 70c. appearance does not change. sample b : clear, blue liquid. boils at 90c leaving blue crystals behind. appearance does not change. sample c : opaque, whitish liquid. boils at 100*c leaving white crystals behind. dust appears to settle at bottom. answer choices for each one are - homogeneous mixture, heterogeneous mixture, or pure substance

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SAMPLE A - pure substance.
SAMPLE B - homogeneous mixture.
SAMPLE C - heterogeneous mixture.
Pure substance - constant composition and properties.
Homogeneous mixture - same uniform appearance and composition.
Heterogeneous mixture - not uniform in composition, two phases (liquid and dust).

Answer from: avenhollander

Sample A is a pure substance, Sample B is a homogeneous mixture and Sample C is a heterogeneous mixture.

Explanation:

Homogeneous mixture : In these mixture, all the component are uniformly distributed throughout the mixture.For example: sugar-water solution.

Heterogeneous mixture : In these mixture, all the component are not uniformly distributed throughout the mixture.For example: sand-water solution.

Pure substance : These are the substance made up only one type of atom or molecule.They have fixed value of boiling and melting points. For example: diamond, pure sugar etc.

Sample A is a clear liquid which evaporates at 70^oC with no change in appearance. Hence, pure substance.

Sample B is a clear blue liquid which boils at 90^oC and leaves blue crystals behind with change in appearance. Hence, homogeneous mixture

Sample C is a opaque, whitish liquid which boils at 100^oC and leaves white crystals behind with dust particles settled in the bottom. Hence, heterogeneous mixture.

Answer from: Quest

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

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