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

Question

1 month ago

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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 [2.7K] · Answer 1 · 2026-03-27T10:13:35+03:00

SAMPLE A - pure substance.
SAMPLE B - homogeneous mixture.
SAMPLE C - heterogeneous mixture.
Pure substance - has a consistent composition and distinct properties.
Homogeneous mixture - exhibits a uniform look and composition throughout.
Heterogeneous mixture - is not uniform in its composition, containing two distinct phases (liquid and particulate matter).

Tems11 [2.7K] · Answer 2 · 2026-03-27T10:09:41+03:00

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.