All AP Chemistry Resources
Example Questions
Example Question #623 : Ap Chemistry
Which of these solutions can be separated via chromatography?
Ethanol and water
Soil and water
A homogeneous solution of organic solvents
B and C
None of the above
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 #624 : Ap Chemistry
Which of the following would most likely form a homogeneous solution?
A and B
NH4Cl and water
NaNO3 and octanol (C8H18O)
All would form homogeneous solutions
Water and benzene (C6H6)
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 #625 : Ap Chemistry
If 50g of NaCl are dissolved in 5 L of water what is the solute and what is the solvent?
NaCl is the solvent and H2O is the solute
Both are solutes since they are mixed together
NaCl can not be dissolved in water because NaCl is ionic and water is a polar solvent
They both are solvents because they dissolve into each other
NaCl is the solute and H2O is the 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 #4 : Representations Of Solutions
What would be the best solvent would you choose to dissolve C31H64?
All of the above
Acetone (C3H6O)
Toluene (C7H8)
Ethanol (C2H5OH)
Water
Toluene (C7H8)
C31H64 is a non-polar substance and would dissolve best in a non-polar solvent like Toluene.
Example Question #1 : Representations Of 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 A
Sample B
Sample C
None of the above
Sample A + B + C
Sample C
The unknown sample gives a single spot that has migrated to the same amount as Sample C.
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