Stem Ch 2 Online Test

22 Questions | Total Attempts: 186

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Stem Ch 2 Online Test

Covers basic chemistry and water


Questions and Answers
  • 1. 
    Atoms are composed of
    • A. 

      Protons with a positive charge

    • B. 

      Neutrons with no charge

    • C. 

      Electrons with a negative charge

    • D. 

      All of the above

  • 2. 
    Electrons of an atom
    • A. 

      Are found in the nucleus along with the protons

    • B. 

      Orbit the nucleus in various energy levels

    • C. 

      Have a positive charge

    • D. 

      Are attracted to the positive charge of neutrons

  • 3. 
    The bond formed when two atoms share a pair of electrons is called a
    • A. 

      Hydrogen bond

    • B. 

      Nonpolar bond

    • C. 

      Covalent bond

    • D. 

      Ionic bond

  • 4. 
    An atom that has gained or lost electrons is called a (an)
    • A. 

      Molecule

    • B. 

      Quark

    • C. 

      Ion

    • D. 

      Element

  • 5. 
    Atoms become more stable when they form compounds because
    • A. 

      They always lost electrons when they form compounds

    • B. 

      Their outer orbitals become filled when they form compounds

    • C. 

      They always gain electrons when they form compounds

    • D. 

      Their nucleus loses extra protons when they form compounds

  • 6. 
    A water molecule is polar because its hydrogen and oxygen atoms
    • A. 

      Both lose electrons

    • B. 

      Become ions

    • C. 

      Both gain electrons

    • D. 

      Do not share the electrons equally

  • 7. 
    Polar molecules, such as water, have
    • A. 

      No negative and positive poles

    • B. 

      Both negative and positive poles

    • C. 

      Only a negative pole

    • D. 

      Only a positive pole

  • 8. 
    Which of the following characteristics of water is NOT a result of hydrogen bonding?
    • A. 

      Adhesion

    • B. 

      Capillarity

    • C. 

      Cohesion

    • D. 

      All of the above are a result of hydrogen bonding

  • 9. 
    Is HCl an ionic or covalent compound?
    • A. 

      Ionic

    • B. 

      Covalent

    • C. 

      Neither

    • D. 

      Both

  • 10. 
    When drawing a Bohr diagram, how many electrons can fit on the inner orbital closest to the nucleus?
    • A. 

      1

    • B. 

      2

    • C. 

      4

    • D. 

      8

  • 11. 
    On a Bohr diagram, the electrons on the outermost shell are called...
    • A. 

      Ions

    • B. 

      Valence electrons

    • C. 

      Isotopes

    • D. 

      Electronegative

  • 12. 
    If you were to draw the Bohr diagram for Sulfur, how many protons would be on the diagram?
    • A. 

      6

    • B. 

      10

    • C. 

      16

    • D. 

      32

  • 13. 
    On the Bohr diagram of Sulfur, how many orbitals (shells) would the drawing contain?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 14. 
    On a Lewis Dot diagram of Sulfur, how many dots would you draw around the S?
    • A. 

      3

    • B. 

      6

    • C. 

      16

    • D. 

      32

  • 15. 
    How many neutrons does Chlorine have?
    • A. 

      10

    • B. 

      17

    • C. 

      18

    • D. 

      34

  • 16. 
    If you were to bond hydrogen with bromine, would the bond between them be single or a double bond?
    • A. 

      Single

    • B. 

      Double

    • C. 

      Both

    • D. 

      Neither

  • 17. 
    Which property of water explains the fact that a penny can hold a lot of water drops?
  • 18. 
    How many electrons does fluorine need to gain or lose in order to fill its outer shell?
  • 19. 
    Give a specific example of a cation.
  • 20. 
    Imagine sucrose has the formula C12H22O11.  (The numbers are subscripts here).  How many atoms does oxygen contain?
  • 21. 
    What is the atomic mass number of carbon?
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