only do the problems if your going to answer all the following question please i really need them all. thank you!!! 2. W

[answerhappygod]

only do the problems if your going to answer all the following
question please i really need them all. thank you!!!
2. Write the empirical formula for at least four ionic
compounds that could be formed from the following ions:
Fe3+, NH+4, BrO−3, CH3CO−2
3. Decide whether each molecule or polyatomic ion is polar
or nonpolar. If the molecule or polyatomic
ion is polar, write the chemical symbol of the
atom closest to the negative side. For example, if the molecule
were HCl and you decided the hydrogen atom was closest to the
negative side of the molecule, you'd enter "H" in the last column
of the table.
HBr
H2O
SiF4
6. A chemist prepares a solution of potassium
dichromate K2Cr2O7 by measuring out 5.05μmol of potassium
dichromate into a 50.mL volumetric flask and filling the flask
to the mark with water.
Calculate the concentration in μmol/L of the chemist's
potassium dichromate solution. Round your answer
to 2 significant digits.
7. The following chemical reaction takes place in aqueous
solution:
ZnCl2(aq) + Na2S (aq) →
ZnS(s) + 2NaCl (aq)
Write the net ionic equation for this reaction.
8. Wine goes bad soon after opening because the ethanol
CH3CH2OH dissolved in it reacts with oxygen O2 gas to
form water and aqueous acetic acid CH3COOH, the main
ingredient in vinegar. Calculate the moles of acetic acid produced
by the reaction of 1.8mol of ethanol.
Be sure your answer has a unit symbol, if necessary, and round
it to 2 significant digits.