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Chem exam 2

  1. What is the HONC rule?
    • Hydrogen forms 1 bond
    • Oxygen forms 2 bonds
    • Nitrogen forms 3 bonds
    • Carbon form 4 bonds
  2. Define isoelectronic.
    When chemicals have the same amount of electrons
  3. What is the difference between an atom and an ion?
    an ion can be an atom but an atom isn't necessarily an ion. An ion is created when an atom gains or loses one or more electrons
  4. What is Avagadro's number?
    6.022x10^23
  5. What is molarity?
    the concentration of a solute in a solution
  6. How do you convert from moles to mass or mass to moles?
    molar mass (found on periodic table)
  7. What do you use when looking for amount of grams in a mole?
    molar mass
  8. What do you use when converting from volume a solution to moles?
    Molarity ( moles of solute/liters of solution)
  9. What is the formula of molarity
    moles of solute/ liters of solution
  10. How do you convert moles of A to moles of B?
    Balanced chemical equation
  11. How do you convert moles to particles?
    Avogadro's number
  12. How do you convert moles to pressure, temperature, or volume?
    PV=nRT
  13. What is the Law of Combining Volumes?
    the observation that gaseous reactants combine to form gaseous products in volume ratios that are simple whole numbers
  14. What is the chemical equation fro ozone?
    O3
  15. What is Avagadro's Law?
    equal volumes of gas at STP contain the same number of molecules
  16. What links moles to volumes?
    Avagadro's Law
  17. What is the Law of Conservation of Mass?
    the total number of each type of atom must be the same on both side of the equation
  18. What process involves the removal of heat energy?
    condensation
  19. What are the diatomic molecules?
    • Hydrogen
    • Nitrogen
    • Fluorine
    • Oxygen
    • Iodine
    • Chlorine
    • Boron
  20. What is the process called when a solid changes directly into a gas?
    Sublimation
  21. Do metals or nonmetals have the highest melting point?
    metals
  22. What are characteristics of ionic compounds?
    • They have high melting points
    • They tend to be solids at room temperature 
    • They are composed of a metal and a nonmetal
    • They may be soluble in water
  23. Please categorize the strength of bonds from weakest to strongest.
    • dispersion
    • dipole-dipole
    • hydrogen
Author
notgonnafail
ID
349081
Card Set
Chem exam 2
Description
sutj
Updated

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