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A solid object has a true mass of 71.5631 pounds.  A student…

A solid object has a true mass of 71.5631 pounds.  A student measured the mass of the object in a lab, and their measured value is too low, with a percent error of 5.61%.  What was the measured mass of the object? Must show work for full credit.  Put your final calculated answer in a readable background color.

Write the element symbol that matches each description.  Sym…

Write the element symbol that matches each description.  Symbols must be written perfectly.  (1 pt each)   A)  Period 4 alkaline earth metal:  [symbola] B)  Period 6 noble gas:  [symbolb] C)  Period 3 element with 5 valence electrons:  [symbolc] D)  Period 2 element that tends to easily form a 2+ charge:  [symbold] E)  Element with 74 protons:  [symbole]

Fill out the ion inventories of the following ionic compound…

Fill out the ion inventories of the following ionic compounds, indicating the quantity and formula (with charge) of the cation, plus the quantity and formula (with charge) of the anion.  Type ^ to indicate superscripts for formulas (for example dog^cat = ).  Provide answers for every blank!  (0.5 pts each)   Quantity of Cation Cation Formula Quantity of Anion Anion Formula sodium sulfate [cationq1] [cationf1] [anionq1] [anionf1] iron (II) dihydrogen phosphate [cationq2] [cationf2] [anionq2] [anionf2] barium phosphide [cationq3] [cationf3] [anionq3] [anionf3] aluminum nitrate [cationq4] [cationf4] [anionq4] [anionf4] silver peroxide [cationq5] [cationf5] [anionq5] [anionf5] magnesium chlorate [cationq6] [cationf6] [anionq6] [anionf6]