Mixture, Compounds And Atoms

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 Mixture,Compounds And Atoms
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  • 1. 

    Atoms are composed of :
    • A. 

      Electrons, neutrons, protos

    • B. 

      Electrons, neutrons, protons

    • C. 

      None of above


  • 2. 
    Which bond exchanges electrons?
    • A. 

      Covalent

    • B. 

      Ionic


  • 3. 
    Which particle orbits the nucleus?
    • A. 

      Neutrons

    • B. 

      Protons

    • C. 

      Electrons


  • 4. 
    Which of the following particle has a positive charge?
    • A. 

      Neutrons

    • B. 

      Protons

    • C. 

      Electrons


  • 5. 
    Which of the following particle has no charge?
    • A. 

      Neutrons

    • B. 

      Protons

    • C. 

      Electrons


  • 6. 
    Most atoms form bonds using only the electrons in their ____ energy level.
    • A. 

      Outermost

    • B. 

      Innermost


  • 7. 
    Which of the following describes what happens when an atom becomes an ion with a 2– charge?
    • A. 

      The atom gains 2 electrons.

    • B. 

      The atom loses 2 electrons.

    • C. 

      The atom has a full outer shell


  • 8. 
    The first energy level is closest to the nucleus and can hold up to ____ electrons.
    • A. 

      2

    • B. 

      4

    • C. 

      8


  • 9. 
    The second energy level can hold up to ____ electrons.
    • A. 

      2

    • B. 

      4

    • C. 

      8


  • 10. 
    Atoms ____ to have a filled outermost energy level
    • A. 

      Split

    • B. 

      Bond


  • 11. 
    Atoms bond by ____ electrons.
    • A. 

      Gain

    • B. 

      Lose

    • C. 

      Share

    • D. 

      All of above


  • 12. 
    Which of the following is a pure substance made up of one type of atoms?
    • A. 

      An element

    • B. 

      Mixture

    • C. 

      Compound


  • 13. 
    What is Filtration?
    • A. 

      Separating an insoluble substance from a liquid by passing the mixture through porous paper.

    • B. 

      Heating to separate a soluble substance such as table salt from water

    • C. 

      None of above


  • 14. 
    What is Distillation?
    • A. 

      A combination of 2 processes- evaporation followed by condensation(eg. to make pure water from seawater

    • B. 

      Heating to separate a soluble substance such as table salt from water

    • C. 

      Separating an insoluble substance from a liquid by passing the mixture through porus paper.


  • 15. 
    Separating funnel 
    • A. 

      Separating an insoluble substance from a liquid by passing the mixture through porous paper.

    • B. 

      Heating to separate a soluble substance such as table salt from water

    • C. 

      A device to separate heavy liquids(eg. water) from lighter liquids(eg. kerosene)


  • 16. 
    Compounds can be separated by:
    • A. 

      Chemical means only

    • B. 

      Physical means only


  • 17. 
    A negative ion is a:
    • A. 

      Anion

    • B. 

      Cation


  • 18. 
    An impure substance made up of two or more elements or compounds both mechanically mixed into any proportion and can be further sub-divided by physical means is a
    • A. 

      Mixture

    • B. 

      Compound


  • 19. 
    A pure substance made up of two or more elements chemically combined in a fixed proportion can be sub-divided by chemical means only is a
    • A. 

      Mixture

    • B. 

      Compound


  • 20. 
    This type of mixture has the same composition through out.
    • A. 

      Homogeneous

    • B. 

      Heterogeneous


  • 21. 
    This type of mixture has a composition that is not uniform.
    • A. 

      Homogeneous

    • B. 

      Heterogeneous


  • 22. 
    This is the liquid which passes through filter paper during filtration.
    • A. 

      Filtrate

    • B. 

      Residue


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