AP Chemistry : Solutions
Study concepts, example questions & explanations for AP Chemistry
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Example Questions
Example Question #13 : Other Solution Concepts
Which of the following definitions is false?
Solubility product, 
Ion-product constant of water, 
Molality is the number of moles of solute in a solution divided by the number of kilogram of solvent.
The van't Hoff factor, i, is the number of ions that a compound produces in a solution.
Solubility product,
Solubility product,
Example Question #61 : Solutions
Which of these solutions can be separated via chromatography?
A homogeneous solution of organic solvents
Soil and water
None of the above
Ethanol and water
B and C
B and C
Chromatography is the physical separation of components of a mixture. Answers b and c can be separated by chromatography due to their homogeneous nature. The soil and water example would be separated by filtration.
Example Question #2 : Representations Of Solutions
Which of the following would most likely form a homogeneous solution?
NH4Cl and water
Water and benzene (C6H6)
NaNO3 and octanol (C8H18O)
A and B
All would form homogeneous solutions
NH4Cl and water
Like dissolves like. The NH4Cl and water mixture involves an ionic solid and a polar solvent. Examples a and b involve mixing polar/non-polar solvents and ionic and non-polar solvents.
Example Question #62 : Solutions
If 50g of NaCl are dissolved in 5 L of water what is the solute and what is the solvent?
NaCl is the solute and H2O is the solvent
Both are solutes since they are mixed together
They both are solvents because they dissolve into each other
NaCl is the solvent and H2O is the solute
NaCl can not be dissolved in water because NaCl is ionic and water is a polar solvent
NaCl is the solute and H2O is the solvent
The solvent is what you the most off. In this case water is the solvent and sodium chloride is the solute.
Example Question #3 : Representations Of Solutions
What would be the best solvent would you choose to dissolve C31H64?
All of the above
Acetone (C3H6O)
Ethanol (C2H5OH)
Water
Toluene (C7H8)
Toluene (C7H8)
C31H64 is a non-polar substance and would dissolve best in a non-polar solvent like Toluene.
Example Question #63 : Solutions
A student investigates a series of compounds in a thin layer chromatography experiment. The student has a sample of three organic compounds labeled A, B, and C as well as an unknown compound. The student performs the experiment as shown on the left above and gets the results shown on the right. What organic compound is in the unknown sample?
Sample C
Sample A
Sample A + B + C
None of the above
Sample B
Sample C
The unknown sample gives a single spot that has migrated to the same amount as Sample C.
Example Question #631 : Ap Chemistry
What is the energy of a photon that has a wavelength of 540 nm?
None of the above
Example Question #632 : Ap Chemistry
What transition would emit the longest wavelength of light?
Not enough information given
n = 4 to n = 3
n = 4 to n = 1
n = 3 to n = 1
n = 2 to n = 1
n = 4 to n = 3
Wavelength is inversely proportional to energy. Since the transition from n=4 to n=3 is the lowest energy transition, it would have the longest wavelength.
Example Question #64 : Solutions
What photon wavelength can promote a transition from the n = 1 (ground state) to the n = 3 (excited state)?
1 m
408 nm
102 nm
306 nm
204 nm
102 nm
Example Question #634 : Ap Chemistry
A 3.0 eV light is shined on Gold ( Փ = 5.1 eV), silver (Փ =4.26 eV), Cesium (Փ = 2.1 eV), and Platinum (Փ = 6.35). If Փ is the work function of the metal, what metal would have electrons ejected?
Ag
Pt
Au
Cs
Au, Ag, and Pt
Cs
The work function is the energy required to remove an electron from a metal. Only Cs metal has a work function less than the energy of the light.
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