Pure And Impure Substances

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| By Manjubrijesh2014
M
Manjubrijesh2014
Community Contributor
Quizzes Created: 2 | Total Attempts: 539
Questions: 5 | Attempts: 393

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Pure And Impure Substances - Quiz

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Questions and Answers
  • 1. 

    Substances with only one type of atom is called

    • A.

      Element

    • B.

      Compound

    • C.

      Mixture

    Correct Answer
    A. Element
    Explanation
    An element is a substance that consists of only one type of atom. It cannot be broken down into simpler substances by chemical means. Examples of elements include oxygen, hydrogen, and carbon.

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  • 2. 

    Carbon di oxide is an example of 

    • A.

      Element

    • B.

      Compound

    • C.

      Mixture

    Correct Answer
    B. Compound
    Explanation
    Carbon dioxide (CO2) is an example of a compound. Compounds are substances that are made up of two or more different elements chemically combined in a fixed ratio. Carbon dioxide is composed of one carbon atom bonded to two oxygen atoms. It is formed through the chemical reaction between carbon and oxygen. Compounds have properties different from their constituent elements and can only be separated into their individual elements through chemical reactions.

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  • 3. 

    Pure substances have .........boiling point

    • A.

      Fixed

    • B.

      Changing 

    Correct Answer
    A. Fixed
    Explanation
    Pure substances have a fixed boiling point because they consist of only one type of molecule or element. The intermolecular forces between the particles in a pure substance are consistent, resulting in a specific temperature at which the substance transitions from a liquid to a gas. This fixed boiling point allows for the identification and characterization of pure substances based on their boiling points. Impurities or mixtures, on the other hand, can cause variations in boiling points due to the presence of different molecules with different intermolecular forces.

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  • 4. 

    Boiling point ...........when we add impurity

    • A.

      Stays the same

    • B.

      Decreases

    • C.

      Increases

    Correct Answer
    C. Increases
    Explanation
    When we add impurities to a substance, it disrupts the regular arrangement of its molecules. This disruption weakens the intermolecular forces between the molecules, making it easier for them to escape into the gas phase. As a result, the boiling point of the substance increases because it requires more energy to break these weaker intermolecular forces and convert the substance from a liquid to a gas.

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  • 5. 

    Substances which can be separated easily ......................

    • A.

      Mixture

    • B.

      Elements

    • C.

      Compounds

    Correct Answer
    A. Mixture
    Explanation
    A mixture refers to a combination of substances that can be easily separated from each other. Unlike elements and compounds, which are pure substances, mixtures are made up of two or more components that retain their individual properties. Mixtures can be separated through physical methods such as filtration, distillation, or evaporation, as the different components have different physical properties. Therefore, the correct answer is mixture.

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