Unit 4: Chemical Bonds

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carrieross
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117129
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Unit 4: Chemical Bonds
Updated:
2011-11-15 20:15:24
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anions cations chemical bonds ionic covalent
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re-take for honors science Grade 9
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  1. The formula for lead (IV) sulfide is:
    PbS2


    [your original choice was PbSO4]
  2. What is the charge of phosphate in K3PO4?
    3-
  3. What is the formula for magnesium nitrate?
    Mg(NO3)2

    [your original choice was MgNO3]
  4. What is the correct formula for magnesium oxide?
    MgO


    [your original choice was MgO2]
  5. What is the formula for calcium oxide also known as "quick lime"?
    CaO


    [your original choice was CaO2]
  6. What is the Negative ion formula for Calcium Carbonate?
    CO3


    [your original choice was CO2]
  7. What is the Negative ion formula for ammonium phosphate?
    PO43-


    [your original answer was P33-]
  8. What is the chemical formula for potassium hydroxide?
    KOH


    [your original answer was K2OH]
  9. What is the Positive ion formula for aluminum oxide?
    Al+1


    [your original answer was Al+2 ]
  10. What is the chemical formula for ammonium phosphate?
    (NH4)3PO4


    [your original answer was NH4P3]
  11. What is the chemical formula for aluminum oxide?
    Al2O3



    [your original answer was AlO2]
  12. What is the name of PbO2?
    Lead (IV) Oxide
  13. What does "polyatomic ion" literally mean?
    • more than 1 atom or molecule
    • "poly" means many
  14. What is the chemical formula of the bicarbonate or hydrogen carbonate anion?
    HCO3-
  15. What is the chemical formula of the carbonate anion?
    CO32-
  16. What is the chemical formula of the sulfate anion?
    SO42-
  17. What is the chemical formula of the ammonium cation?
    NH4+1
  18. The chemical formula for rust is Fe2)3.
    Which element has more atoms in the formula?
    Which element has a larger share of the mass in the formula?
    Eplain
    • 56Fe x2 = 112 = more mass
    • 16O x3 = 48
  19. List the elements that form water and give one PHYSICAL property and one CHEMICAL property for each of the elements that are different from those of water
    • Hydrogen is a gas; it's flammable
    • Oxygen is a gas; it's flammable
  20. What is the total number of atoms in the compound Ca (ClO3)2?
    9
  21. The formula for battery acid is ?
    H2SO4
  22. The formula for stomach acid is?
    HCl
  23. Covalent compounds form between nonmetals and?
    nonmetals
  24. ionic comounds form between metals and?
    nonmetals
  25. The sum of the oxidation numbers in a neutral is always?
    0 (zero)
  26. What is the chemical formula for magnesium nitrate?
    Mg(NO3)2
  27. How do you show a formula with a hydrate?
    x a water molecule
  28. What is the correct order, from most abundant to least abundant, of the 4 main atmosheric gases?
    N2, O2, Ar, CO2
  29. How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
    8
  30. How are the properties of table salt different from those of sodium and chloride?
    By themselves they are toxic to humans and combined they are edible
  31. What is the formula for magnesium chloride?
    What is the formula for calcium oxide?
    • MgCl
    • CaO
  32. What is the formula for:
    copper(I)sulfide
    calcium chloride
    Magnesium Iodide
    • CuS
    • CaCl
    • MgI2
  33. What is the formula for :
    potassium hydroxide
    calcium carbonate
    ammonium phosphate
    aluminum oxide
    • KOH
    • CaCO3
    • (NH4)3PO4
    • Al2O3


  34. What are the names of:
    KOH
    CaCO3
    (NH4)3PO4
    Al2O3
    • potassium hydroxide
    • calcium carbonate
    • ammonium phosphate
    • aluminum oxide
  35. What are the names of:
    CaBr2
    CuCl
    MgS
    • Calcium Bromide
    • Copper Chloride
    • Magnesium Sulfide
  36. Explain what happens to the electrons in a covalent bond.
    The electrons are shared between the 2 atoms
  37. Explain why CaCO3 contains both ionic and covalent bonds?
    • Carbon and Oxygen make COVALENT bonds
    • Calcium and Carbon/Oxygen make an IONIC compound
  38. A particle obtained by adding or removing electrons from atoms or molecules is called a_____?

    An atom or molecule with extra electrons has a net negative charge and is called a ____?

    An atom or molecule with missing electrons has a net positive charge and is called a
    ion

    cation

    anion
  39. Covalent bonding occurs between ions/electrons?
    electrons
  40. ________ bonding occurs between ions?
    Chemical
  41. The properties of a compound are the same as/different than the properties of the elments making up the compound.
    different
  42. The formula SO42- stands for ammonium? T/F
    • F
    • battery acid
  43. Molecules and compounds are _____?
    neutral
  44. A hydrate is a substance that contains/does not contain water?
    contains
  45. An element's oxidation number indicates how many electrons the elemnt must gain, lose or share to become stable. T/F
    T
  46. The smallest particle of an element that still maintains the properties of that elemt is an electron.
    • F
    • atom
  47. How many hydrogen atoms are present in one molecule of ammonium acetate, NH4C2H3O2?
    7
  48. A chemical bond that occurs when atoms share electrons is a(n) _____ bond.
    covalent
  49. What kind of chemical bond is fromed when an equal exchange of electrons occurs?
    ionic
  50. A chemical bond formed by the sharing of one or more electrons _____
    covalent
  51. An unknown compound of small blue crystals that gives/gave off steam is a(n) hydrate/anhydride?
    • hydrate
    • blue = water

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