AP CHEMISTRY EXAM - procedure?: C • When the equation above is ba...

AP CHEMISTRY EXAM

• When a buret is rinsed before a titration, which of the techniques below is the best

procedure?: C

• When the equation above is balanced and all coefficients are reduced to lowest whole

number terms, the coefficient for Fe^2+(aq) is: Not Needed

• A solution of methanol, Ch2OH, in water is prepared by mixing together 25.67g of methanol and 32.84g of water. The mole fraction of methanol in the solution is closest to: B • A sample of a compound contains 36.00% of sulfur and 64.00% of fluorine by mass.

Which of the following represents the empirical formula of the compound?: B

• Of the following, the best explanation for the fact that most gases are easily compressed

is that the molecules in a gas: B

• Given that the density of Hg(l) at 0*C is about 14g ml^-1, which of the following is

closet to the volume of 1.5 mole of Hg(l) at this temperature?: E

• A sample of an unknown gas from a cylinder is collected over water in the apparatus shown above. After all the gas sample has been collected, the water levels inside and outside the gas collection tube are made the same.

Measurements that must be made to calculate the molar mass of the gas include all of the

following: E

• When a student prepares an aqueous solution containing the five cations Ag+(aq), Hg2^2+(aq), Cu2+(aq), Mn2+(aq), and Ba2+(aq), the student observes that no precipitates form in the solution. Which of the following could be the identity of the anion in the solution?: ?• What is the molarity of I-(aq) in a solution that contains 25.46g of SRl2 in 1.00 L of the

solution?: C

• Which of the following is the correct name for the compound with the formula

NH4ClO3?: A

• By mixing only 0.34 HCl and 0.09 M HCl, it is possible to create all of the following

solutions EXCEPT: A

• A rigid metal tank contains oxygen gas. Which of the following applies to the gas in the tank when oxygen is removed at constant temperature?: B 21. 2NO(g)+o2(g)=>2NO2(g)

• Solid Na3PO4 is added to distilled water to produce a solution in which the concentration of phosphate, [PO4^3], is 0.20 M. What is the concentration of aluminum ion, [Na+], in this

solution?: C

• In 2.00 mol of potassium sulfate dodecahydrate, KAI(SO4)2*12H2O, there are: C

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