it14spr101.40DC2T4 5 6

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it14spr101.40DC2T4 5 6
2014-01-16 21:51:13

Show Answers:

  1. How is a molecule formed?
    when two or more atoms combine
  2. What does molecular formula show?
    it depicts the numbers and kinds of atoms in a molecule by the use of subscripts
  3. What does structural formula do?
    shows how atoms bond and how they are arranged in a molecule
  4. What are electron shells?
    they hold the electrons of an atom
  5. What is the octet rule?
    The outer shell attempts to be filled to 8 electrons, but the innermost electron shells are filled first
  6. How are bonds formed?
    when atoms combine
  7. What is a valence electron?
    an electron in the outer shell of an atom that can combine/shared with other atoms to form molecules
  8. What are inert atoms?
    Atoms that have completely full outermost electron shells that are not reactive
  9. What are ions?
    atoms that gain or lose electrons and become electrically charged
  10. How are cations formed?
    cations are positively charged atoms because of losing electrons
  11. What are anions?
    atoms that become negatively charged because they gain electrons
  12. What is an ionic bond?
    Attraction between a cation and an anion that is formed when electrons are transferred from one atom to another atom
  13. How is a covalent bond formed?
    Formed when atoms share electrons in an attempt to fill the outer shell
  14. What is a polar molecule?
    Specialized molecule where electrons are not shared equally and the molecule has a slight positive charge at one end and a slight negative charge at the other
  15. What is a hydrogen bond?
    a bond formed by the attraction of a positive hydrogen end of a polar molecule (water) to the negative oxygen end of another polar molecule (water)
  16. What are reactants?
    substances being changed
  17. What are products?
    any substances formed at the end of a chemical reaction
  18. When does synthesis reaction occur?
    Occurs when two or more atoms, ions, or molecules bond to form a more complex structure
  19. When does decomposition reaction take place?
    Occurs when the bonds of a reactant molecule break to from simpler molecules
  20. When does exchange reaction take place?
    Occurs when parts of two different kinds of molecules trade positions
  21. When does reversible reaction occur?
    Occurs when products can change back to the reactant or reactants
  22. What is a catalyst?
    Molecules that influence the rates of chemical reactions but are not consumed in the reactions