Science: Chapter 10 - Mixture and Impurities Quiz

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Questions and Answers

What is the definition of an impurity?

  • A mixture of solute dissolved in solvent
  • A substance that contains other elements or compounds (correct)
  • A substance that dissolve in a solvent
  • A substance made from one type of element or compound

In a solution with a high concentration of salt, what does this indicate?

  • Low concentration of solvent
  • Equal proportion of solute and solvent
  • Absence of solute in solvent
  • Large amount of solute in solvent (correct)

How does the color of orange juice change when a large glass of water is poured into it?

  • The color becomes lighter (correct)
  • The color turns green
  • The color remains the same
  • The color becomes darker

What does chromatography aim to accomplish?

<p>Separating compounds of a mixture (A)</p> Signup and view all the answers

On what principle does chromatography work?

<p>Concentration of compound (C)</p> Signup and view all the answers

What is one of the applications of chromatography?

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

In a solution, what role does the solvent play?

<p>Liquid in which the solute dissolves (D)</p> Signup and view all the answers

What is the main difference between a pure substance and an impurity?

<p>Pure substances are made from one type of element or compound, while impurities contain other elements or compounds. (B)</p> Signup and view all the answers

In a solution with a high concentration of salt, what does this suggest about the amount of solute present?

<p>The amount of solute is very high. (D)</p> Signup and view all the answers

Why does the color of orange juice become lighter when water is added to it?

<p>The amount of water added dilutes the orange juice. (D)</p> Signup and view all the answers

Which statement accurately describes the process of chromatography?

<p>Chromatography separates substances dissolved in a liquid by allowing the liquid to flow through a chromatogram. (A)</p> Signup and view all the answers

What does chromatography aim to accomplish?

<p>To separate substances dissolved in a liquid from each other. (D)</p> Signup and view all the answers

Which principle does chromatography primarily work on?

<p>Separating compounds of a mixture (A)</p> Signup and view all the answers

What is NOT an application of chromatography?

<p>Food preservation (D)</p> Signup and view all the answers

Flashcards

Impurity definition

A substance containing other elements or compounds.

High salt concentration

Large amount of salt (solute) in the liquid (solvent).

Orange juice color change

Adding water lightens the color.

Chromatography goal

Separates compounds from a mixture.

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Chromatography principle

Separates compounds based on their properties.

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Chromatography application

Used in forensic science.

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Solvent role

The liquid in which a solute dissolves.

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Pure substance vs. impurity

Pure substances have one type of element or compound; impurities have more than one.

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High salt concentration (solute)

Indicates a large amount of solute is present.

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Adding water to orange juice

Dilution occurs; color becomes lighter.

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Chromatography Process

Separates substances in a liquid by letting the liquid flow through a paper or column.

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Chromatography's Purpose

Separates different compounds in a mixture.

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Chromatography Principle (specific)

Separation of mixture components based on different interactions with the stationary and mobile phase.

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Non-application of chromatography

Food preservation is not a direct application of chromatography.

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Study Notes

  • Pure substance is made from one type of element or compound.
  • An impurity is a substance that contains other elements or compounds.
  • Solute is a substance that dissolves in a solvent, while a solvent is the liquid in which the solute dissolves, resulting in a solution.
  • A high concentration of salt in a solution indicates a large amount of solute in the solvent.
  • Mixing a glass of orange juice with a glass of water will result in the orange juice becoming lighter due to the higher amount of water.
  • Chromatography is a method to check the number of solutes in a solvent and involves separating substances dissolved in a liquid by allowing the liquid to flow through a chromatogram.
  • Chromatography works based on the principles of compound concentration and separating compounds in mixtures.
  • Applications of chromatography include drug testing, forensic analysis, and food testing.

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