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Ugo
9 days ago
13

Simon has collected three samples from the coral reef where he observes marine life. He must determine whether each one is a pur

e substance or a mixture.
SAMPLE A : Clear liquid. Evaporates at 70*C. Appearance does not change.
SAMPLE B : Clear, blue liquid. Boils at 90*C 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
Chemistry
2 answers:
lorasvet [2.5K]9 days ago
7 0
SAMPLE A - <span>pure substance.
</span>SAMPLE B - <span>homogeneous mixture.
</span>SAMPLE C - <span>heterogeneous mixture.
</span>Pure substance - <span>has a consistent composition and distinct properties.</span>
Homogeneous mixture - exhibits a uniform look and composition throughout.
Heterogeneous mixture - <span>is </span>not uniform<span> in its composition, containing two distinct phases (liquid and particulate matter).
</span>
Tems11 [2.4K]9 days ago
4 0

Answer: Sample A is classified as a pure substance, Sample B is identified as a homogeneous mixture, and Sample C is a heterogeneous mixture.

Explanation:

Homogeneous mixture: In these mixtures, all components are evenly distributed. For example: a sugar-water solution.

Heterogeneous mixture: In these mixtures, components are not uniformly distributed. For instance: a sand-water solution.

Pure substance: These are made from a single type of atom or molecule and are characterized by fixed boiling and melting points. Examples include diamond and pure sugar.

Sample A is a clear liquid evaporating at 70^oC with a consistent appearance. Thus, it is a pure substance.

Sample B is a clear blue liquid boiling at 90^oC that leaves behind blue crystals, resulting in a change in appearance. Hence, it is a homogeneous mixture

Sample C is an opaque, whitish liquid boiling at 100^oC, leaving white crystals, with dust settling at the bottom. Thus, it is a heterogeneous mixture.

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