Pure Substances and Mixtures Quiz

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Questions and Answers

What is a mixture?

  • A chemical compound
  • An element in solid form
  • A single pure substance
  • Two or more pure substances combined (correct)

All substances encountered in daily life are pure substances.

False (B)

What are the components of a soft drink?

Liquid water, solid sugar, and carbon dioxide gas.

Breads are mixtures of yeast, flour, sugar, water, air, and other __________.

<p>chemicals</p> Signup and view all the answers

Match the following substances with their classification:

<p>Soft drink = Mixture Table salt = Pure substance Air = Mixture Gold = Pure substance</p> Signup and view all the answers

Why can the properties of mixtures differ in different samples?

<p>They contain different amounts of substances. (D)</p> Signup and view all the answers

Ink is considered a mixture.

<p>True (A)</p> Signup and view all the answers

What happens during the ink test with filter paper?

<p>The water soaks into the filter paper, spreading the ink.</p> Signup and view all the answers

What defines a pure substance?

<p>A substance that contains only one kind of particle (A)</p> Signup and view all the answers

Pure water can be easily found in nature.

<p>False (B)</p> Signup and view all the answers

Give an example of a pure substance.

<p>Diamond</p> Signup and view all the answers

All samples of a pure substance have the same properties, regardless of their ______.

<p>size</p> Signup and view all the answers

Match the following examples with their classification:

<p>Diamond = Pure Substance Water = Mixture Table Sugar = Pure Substance Spring Water = Mixture</p> Signup and view all the answers

Which of the following is an example of refining to create a pure substance?

<p>Extracting aluminum from ore (D)</p> Signup and view all the answers

All pure substances have different properties depending on their origin.

<p>False (B)</p> Signup and view all the answers

Why are reference lists of pure substances important for scientists?

<p>They provide standardized properties for comparison.</p> Signup and view all the answers

Flashcards

Pure Substance

A substance made up of only one type of particle.

Mixture

A substance that can be broken down into simpler substances.

Uniform Properties

Properties that are the same for every sample, regardless of size or location.

Reference Lists of Pure Substances

A collection of data about the characteristics of a substance, like melting point and density.

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Refining

The process of removing impurities from a substance.

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Pure Substance

A substance in which all the particles are identical. Example: Diamond.

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Mixture

A substance that can be broken down into simpler substances. Example: Saltwater.

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Uniform Properties

All samples of the same pure substance have the same properties.

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Variable Properties of Mixtures

The properties of a mixture can vary depending on the amounts of each pure substance. For example, bread might have more sugar or yeast in one sample than another.

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Mixture Diagram

A representation showing the arrangement of substances in a mixture. For example, a diagram showcasing the combination of liquids, solids, and gases in soft drinks.

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Chromatography

A process used to separate components of a mixture based on their different solubilities in a solvent.

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Solubility

The ability of a substance to dissolve in a solvent.

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Solvent

A substance that dissolves another substance, known as the solute.

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Solute

The substance that is dissolved in a solvent.

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Study Notes

Pure Substances and Mixtures

  • Matter is made of particles. Different substances have different properties due to different particle types.
  • A pure substance contains only one type of particle. Many pure substances exist, but few are naturally found pure in nature.
  • Water is a pure substance, but even the clearest spring water contains dissolved minerals.
  • Diamonds are a pure substance, formed deep within the Earth.
  • Most pure substances encountered daily are refined (e.g., aluminum foil, table sugar).
  • Pure substances have consistent properties regardless of their size or location. They have fixed melting and boiling points, density, and other properties.
  • Scientists use reference lists of pure substances and their properties to identify unknown substances.

Mixtures

  • Almost all natural substances and manufactured products are mixtures of pure substances.
  • Mixtures contain two or more pure substances.
  • Mixtures can be combinations of solids, liquids, and gases.
  • Examples include soft drinks (water, sugar, carbon dioxide), bread (yeast, flour, sugar, water, etc).
  • The properties of mixtures can vary depending on the relative amounts of different substances in the sample.

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Related Documents

Pure Substances and Mixtures Chapter 6.1 PDF

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