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AP Chemistry : AP Chemistry

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6 Diagnostic Tests 225 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #64 : Solutions

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

Possible Answers:

Acetone (C₃H₆O)

Water

All of the above

Ethanol (C₂H₅OH)

Toluene (C₇H₈)

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 #65 : 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:

None of the above

Sample A

Sample A + B + C

Sample C

Sample B

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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Example Question #631 : Ap Chemistry

What is the energy of a photon that has a wavelength of 540 nm?

Possible Answers:

None of the above

$3.68 x 10^{-17} J$

$3.68 x 10^{-28} J$

$3.68 x 10^{-19} J$

$7.36 x 10^{-17} J$

Correct answer:

$3.68 x 10^{-19} J$

Explanation:

$E= \frac{hc}{\lambda}$ ; $E = \frac{(6.626 \, x \, 10^{-34} J\cdot s)(3.00\, x\, 10^{-8} m/s)}{5.40 \, x \, 10^{-7} m/s}$ ; $E = 3.68 \, x \, 10^{-19}\, J$

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Example Question #632 : Ap Chemistry

What transition would emit the longest wavelength of light?

Possible Answers:

Not enough information given

n = 4 to n = 3

n = 4 to n = 1

n = 3 to n = 1

n = 2 to n = 1

Correct answer:

n = 4 to n = 3

Explanation:

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.

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Example Question #632 : Ap Chemistry

What photon wavelength can promote a transition from the n = 1 (ground state) to the n = 3 (excited state)?

Possible Answers:

408 nm

102 nm

306 nm

1 m

204 nm

Correct answer:

102 nm

Explanation:

$\Delta E = (-2.18 \, x \, 10^{-18} \, J)(\frac{1}{3^2} -\frac{1}{1^2}) = 1.94 \, x\, 10^{-18} \, J$

$E =\frac{hc}{\lambda }$ ; $\lambda =\frac{hc}{E} = \frac{(6.626 \, x \, 10^{-34}\, J \cdot s)(3.00\, x\, 10^8 m/s)}{1.94 \, x \, 10^{-18} \, J} = 1.02 \, x\, 10^{-7} m = 102 nm$

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Example Question #633 : 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?

Possible Answers:

Au, Ag, and Pt

Correct answer:

Explanation:

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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Example Question #635 : Ap Chemistry

A student has a Blue #1 dye with a molar absorptivity of 1.30 x 10⁵ M^-1 cm^-1 at 631 nm. If the student runs this sample through a spectrophotometer and finds it has an absorption of 0.500 what is the dye’s molarity? Assume a path length of 1.0 cm.

Possible Answers:

$11.5 \, x \, 10^{-5} M$

$3.9 \, x\, 10^{-6} M$

$1.9 \, x \, 10^{-5} M$

$1.9 \, x \, 10^{-6} M$

$3.9 \, x \, 10^{-5} M$

Correct answer:

$3.9 \, x\, 10^{-6} M$

Explanation:

$A = \varepsilon bc$ ; $c =\frac{ A}{\varepsilon b}= \frac{0.500}{(1.30\, x \, 10^5 M^{-1} cm^{-1})(1.00 cm)} = 3.9 \, x \, 10^{-6} M$

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Example Question #1 : Net Ionic Equations

What is the net ionic equation for the reaction that occurs when sodium chloride is mixed with silver nitrate.

Possible Answers:

Na⁺ (aq) + NO₃^- (aq) -> NaNO₃ (s)

NaCl (aq) + AgNO3 (aq) -> NaNO₃ (aq) + AgCl (aq)

NaCl (aq) + AgNO₃ (aq) -> NaNO₃ (aq) + AgCl (s)

Ag⁺(aq) + Cl^- (aq) -> AgCl (s)

NaCl (aq) + AgNO₃ (aq) -> NaNO₃ (s) + AgCl (aq)

Correct answer:

Ag⁺(aq) + Cl^- (aq) -> AgCl (s)

Explanation:

Only the Ag and Cl ions are reacting to form solid silver chloride.

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Example Question #2 : Net Ionic Equations

What is the net ionic equation that occurs when sodium chloride is mixed with potassium nitrate?

Possible Answers:

No Reaction

NaCl (aq) + KNO₃ (aq) -> KNO₃ (aq) + KCl (s)

NaCl (aq) + KNO3 (aq) -> NaNO₃ (aq) + KCl (aq)

NaCl (aq) + KNO₃ (aq) -> NaNO₃ (s) + KCl (aq)

Na⁺ (aq) + NO₃^- (aq) -> NaNO₃ (s)

Correct answer:

No Reaction

Explanation:

Since no precipitation is predicted by the solubility rules, there will be no reaction.

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Example Question #3 : Net Ionic Equations

What is the net ionic reaction when potassium carbonate is mixed with Calcium bromide?

Possible Answers:

2 K₂CO₃ (aq) + CaBr₂(aq) -> 2 KBr (s) + CaCO₃(aq)

Ca²⁺ (aq) + CO₃^2- (aq) -> CaCO₃(s)

2 K₂CO₃ (aq) + CaBr₂ (aq) -> 2 KBr (aq) + CaCO₃(aq)

2 K₂CO₃ (aq) + CaBr₂ (aq) -> 2 KBr (aq) + CaCO₃(s)

2 K⁺ (aq) + Br^- (aq) -> 2 KBr (s)

Correct answer:

Ca²⁺ (aq) + CO₃^2- (aq) -> CaCO₃(s)

Explanation:

Only the calcium and carbonate ions are reacting according to the solubility rules to form calcium carbonate.

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AP Chemistry : AP Chemistry

Study concepts, example questions & explanations for AP Chemistry

All AP Chemistry Resources

Example Questions

Example Question #64 : Solutions

Example Question #65 : Solutions

Example Question #631 : Ap Chemistry

Example Question #632 : Ap Chemistry

Example Question #632 : Ap Chemistry

Example Question #633 : Ap Chemistry

Example Question #635 : Ap Chemistry

Example Question #1 : Net Ionic Equations

Example Question #2 : Net Ionic Equations

Example Question #3 : Net Ionic Equations

All AP Chemistry Resources

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