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AP Chemistry : Representations of Solutions

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Example Questions

Example Question #1 : Representations Of Solutions

Which of these solutions can be separated via chromatography?

Possible Answers:

B and C

Ethanol and water

A homogeneous solution of organic solvents

None of the above

Soil and water

Correct answer:

B and C

Explanation:

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.

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Example Question #2 : Representations Of Solutions

Which of the following would most likely form a homogeneous solution?

Possible Answers:

Water and benzene (C₆H₆)

NaNO₃ and octanol (C₈H₁₈O)

NH₄Cl and water

A and B

All would form homogeneous solutions

Correct answer:

NH₄Cl and water

Explanation:

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.

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Example Question #3 : Representations Of Solutions

If 50g of NaCl are dissolved in 5 L of water what is the solute and what is the solvent?

Possible Answers:

Both are solutes since they are mixed together

NaCl is the solute and H₂O is the solvent

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

Correct answer:

NaCl is the solute and H₂O is the solvent

Explanation:

The solvent is what you the most off. In this case water is the solvent and sodium chloride is the solute.

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Example Question #4 : Representations Of Solutions

What would be the best solvent would you choose to dissolve C₃₁H₆₄?

Possible Answers:

Water

All of the above

Toluene (C₇H₈)

Acetone (C₃H₆O)

Ethanol (C₂H₅OH)

Correct answer:

Toluene (C₇H₈)

Explanation:

C₃₁H₆₄ is a non-polar substance and would dissolve best in a non-polar solvent like Toluene.

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Example Question #5 : 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?

Possible Answers:

Sample A + B + C

Sample C

Sample B

None of the above

Sample A

Correct answer:

Sample C

Explanation:

The unknown sample gives a single spot that has migrated to the same amount as Sample C.

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AP Chemistry : Representations of Solutions

Study concepts, example questions & explanations for AP Chemistry

All AP Chemistry Resources

Example Questions

Example Question #1 : Representations Of Solutions

Example Question #2 : Representations Of Solutions

Example Question #3 : Representations Of Solutions

Example Question #4 : Representations Of Solutions

Example Question #5 : Representations Of Solutions

All AP Chemistry Resources

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