AP Chemistry Exam with Verified
Answers
1) 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
2) In 2.00 mol of potassium sulfate dodecahydrate, KAI(SO4)2*12H2O, there are - ✔✔C
3) To determine the percentage of water in a hydrated salt, a student heated a 1.2346 g sample
of the salt for 30 minutes; when cooled to room temperature, the sample weighed 1.1857 g.
After the sample was heated for an additional 10 minutes and again cooled to room
temperature, the sample weighed 1.1632 g. Which of the following should the student do next?
- ✔✔D
4) Which of the following statements about atoms is NOT correct - ✔✔B
5) When 3.0 L of He(g) and 5.00 L of N2(g), both at 25*C and 1.0 atm, are pumped into an
evacuated 10.0 L rigid container, the final pressure in the container at 0*C is - ✔✔D
7) What is the maximum number of moles of FE3O4, that can be produced (water is also a
product) by the reaction of 0.60 mol of Fe2O3, with 0.60 mol of H2? - ✔✔?
8) The volume of water that must be added in order to dilute 25 mL of 18.0 M HCl to a
concentration of 3.0 M is closet to - ✔✔D
2KCLO3(s)=>2KCL(s)+3O2(g)
9) What is the percentage yield of O2, if 5.678 g of KCLO3 is decomposed to produce 0.06800
mol of O2 according to the equation shown above? - ✔✔E
, 10) When a buret is rinsed before a titration, which of the techniques below is the best
procedure? - ✔✔C
11) 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
13) 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
14) 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
15) Of the following, the best explanation for the fact that most gases are easily compressed is
that the molecules in a gas - ✔✔B
16) 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
17) 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
18) 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? - ✔✔?
19) What is the molarity of I-(aq) in a solution that contains 25.46g of SRl2 in 1.00 L of the
solution? - ✔✔C
Answers
1) 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
2) In 2.00 mol of potassium sulfate dodecahydrate, KAI(SO4)2*12H2O, there are - ✔✔C
3) To determine the percentage of water in a hydrated salt, a student heated a 1.2346 g sample
of the salt for 30 minutes; when cooled to room temperature, the sample weighed 1.1857 g.
After the sample was heated for an additional 10 minutes and again cooled to room
temperature, the sample weighed 1.1632 g. Which of the following should the student do next?
- ✔✔D
4) Which of the following statements about atoms is NOT correct - ✔✔B
5) When 3.0 L of He(g) and 5.00 L of N2(g), both at 25*C and 1.0 atm, are pumped into an
evacuated 10.0 L rigid container, the final pressure in the container at 0*C is - ✔✔D
7) What is the maximum number of moles of FE3O4, that can be produced (water is also a
product) by the reaction of 0.60 mol of Fe2O3, with 0.60 mol of H2? - ✔✔?
8) The volume of water that must be added in order to dilute 25 mL of 18.0 M HCl to a
concentration of 3.0 M is closet to - ✔✔D
2KCLO3(s)=>2KCL(s)+3O2(g)
9) What is the percentage yield of O2, if 5.678 g of KCLO3 is decomposed to produce 0.06800
mol of O2 according to the equation shown above? - ✔✔E
, 10) When a buret is rinsed before a titration, which of the techniques below is the best
procedure? - ✔✔C
11) 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
13) 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
14) 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
15) Of the following, the best explanation for the fact that most gases are easily compressed is
that the molecules in a gas - ✔✔B
16) 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
17) 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
18) 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? - ✔✔?
19) What is the molarity of I-(aq) in a solution that contains 25.46g of SRl2 in 1.00 L of the
solution? - ✔✔C
