Mixture Chemistry Example 2

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Example 2

medium
A student has a clear, colorless liquid. Describe two experimental tests to determine whether it is a pure substance or a mixture.

Solution

  1. 1
    Test 1 — Boiling point test: Heat the liquid and measure its boiling point. A pure substance boils at a sharp, constant temperature, while a mixture boils over a range of temperatures.
  2. 2
    Test 2 — Density measurement: Take multiple samples from different parts of the liquid and measure their density. A pure substance has a uniform density; a mixture may show variation.
  3. 3
    If the liquid boils at a single temperature and has consistent density, it is likely a pure substance. A boiling range suggests a mixture.

Answer

Test boiling point (sharp vs. range) and density (uniform vs. variable).\text{Test boiling point (sharp vs. range) and density (uniform vs. variable).}
Pure substances have characteristic physical properties that are constant and reproducible. Mixtures show variable properties depending on their composition, which provides a reliable way to distinguish them experimentally.

About Mixture

A physical combination of two or more substances that are not chemically bonded, retain their individual properties, exist in variable proportions, and can be separated.

Learn more about Mixture →

More Mixture Examples

Example 1 easy

Define a mixture and explain how it differs from a pure substance. Give two examples.

Example 3 medium

Explain why mixing iron filings and sulfur powder produces a mixture, but heating them together prod

Example 4 hard

Seawater contains dissolved salts ([formula]), dissolved gases, and suspended particles. Classify se

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