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

Example Questions

Example Question #3 : Reaction Mechanisms

Based on the figure above, what arrows corresponds to the activation energy of the rate limiting step and the energy of reaction? Is the reaction endo- or exothermic?

Possible Answers:

Endothermic

Exothermic

Correct answer:

Endothermic

Explanation:

Since the products are higher in energy than the reactions, the reaction is endothermic.

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Example Question #4 : Reaction Mechanisms

Consider the following mechanism:

A + B -> R + C (slow)

A + R -> C (fast)

Possible Answers:

There are no intermediates

Correct answer:

Explanation:

R is the intermediate. It is formed in Step 1 and consumed in Step 2.

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Example Question #1 : Hess' Law

Using the following data to calculate the enthalpy change in: 3 NO₂(g) + H2O (l) -> 2 HNO₃ (aq) + NO (g)

04q

Possible Answers:

264 kJ/mol

-137 kJ/mol

68.5 kJ/mol

137 kJ/mol

-68.5 kJ/mol

Correct answer:

-137 kJ/mol

Explanation:

04a

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Example Question #2 : Hess' Law

Using the following data to calculate the enthalpy change in: 2 CH₄ (g) + 3 O₂-> 2 CO (g) + 4 H₂O (l)

05q

Possible Answers:

-214.2 kJ/mol

214.2 kJ/mol

-418.4 kJ/mol

-1214 kJ/mol

418.4 kJ/mol

Correct answer:

-1214 kJ/mol

Explanation:

05a

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Example Question #651 : Ap Chemistry

Using the following data to calculate the enthalpy change in: C₄H₁₀O(l) -> C₄H₈ (g) + H₂O_(g)

01q

Possible Answers:

-152 kJ/mol

-76 kJ/mol

76 kJ/mol

152 kJ/mol

-17 kJ/mol

Correct answer:

76 kJ/mol

Explanation:

01a

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Example Question #652 : Ap Chemistry

Using the following data to calculate the enthalpy change in: CaO (s) + H₂O (l) -> Ca(OH)₂ (aq)

02q

Possible Answers:

-124 kJ/mol

-147 kJ/mol

124 kJ/mol

-62 kJ/mol

147 kJ/mol

Correct answer:

-147 kJ/mol

Explanation:

02a

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Example Question #3 : Hess' Law

Using the following data to calculate the enthalpy change in: B₂H₆ (g) + 3 O₂(g) -> B₂O₃ (s) + 3 H₂O (l)

03q

Possible Answers:

2168 kJ/mol

-1084 kJ/mol

1084 kJ/mol

-2168 kJ/mol

3252 kJ/mol

Correct answer:

-2168 kJ/mol

Explanation:

03a

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Example Question #1 : Properties Of The Equilibrium Constant

Calculate the equilibrium constant for $2 C(g) \Leftrightarrow A (g) + B (g)$ given the following information:

$A (g) + B (g) \Leftrightarrow 2 C (g)$ $K_1 = 4.39 x 10^{-3}$

$2 C(g) \Leftrightarrow D (g) + E (g)$ K_2 = 1.15 x 10^4

Possible Answers:

22.8

$3.14 \, x \, 10^{-3}$

11.4

$2.28 \, x \, 10^2$

$1.14\, x\, 10^2$

Correct answer:

$2.28 \, x \, 10^2$

Explanation:

$2 C \Leftrightarrow A + B$ K = 1/K_1= 228

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Example Question #1 : Properties Of The Equilibrium Constant

Calculate the equilibrium constant for $A (g) + B (g) \Leftrightarrow D (g) + E (g)$ given the following information:

$A (g) + B (g) \Leftrightarrow 2 C (g)$ $K_1 = 4.39 \, x \, 10^{-3}$

$2 C(g) \Leftrightarrow D (g) + E (g)$ $K_2 = 1.15 \, x \, 10^4$

Possible Answers:

50.5

15.8

0.143

73.2

25.3

Correct answer:

50.5

Explanation:

$A + B \Leftrightarrow 2 C$ $K_1 = 4.39 x 10^{-3}$

$2C \Leftrightarrow D + E$ $K_2 = 1.15 x 10^{-4}$

$K = K_1 K_2 = (4.39 x 10^{-3}) (1.15 x 10^{-4}) = 50.5$

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Example Question #2 : Properties Of The Equilibrium Constant

Calculate the equilibrium constant for $N_2 (g) + O_2 (g) + Cl_2 (g) \Leftrightarrow 2 \: NOCl$ given the following information:

$\frac{1}{2}N_2 + O_2(g) \Leftrightarrow NO_2 (g)$ $K_1 = 1.0 \, x \, 10^{-9}$

$NOCl(g) + \frac{1}{2} O_2 (g) \Leftrightarrow NO_2Cl$ $K_2 = 1.1 \, x\, 10^2$

$NO_2 (g) + \frac{1}{2} Cl_2 \Leftrightarrow NO_2Cl$ K_3 = 0.3

Possible Answers:

$7\, x\, 10^{-8}$

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

$3\, x\, 10^{-3}$

$7\, x\, 10^{-24}$

Correct answer:

$7\, x\, 10^{-24}$

Explanation:

$2 (1/2 N_2 + O_2 \Leftrightarrow 2 NO_2 )$ $K = K_1^2 = 1 x 10^{-18}$

$2 (NO_2Cl \Leftrightarrow NOCl + 1/2 O_2)$ $K = (1/K_2)^2 = 8.3 x 10^{-5}$

$2 (NO_2 + 1/2 Cl_2 \Leftrightarrow NO_2Cl)$ K = K_3^2 = 0.09

$K = (1 x 10^{-18}) (8.3 x 10^{-5}) (0.09) = 7 x 10^{-24}$

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AP Chemistry : AP Chemistry

Study concepts, example questions & explanations for AP Chemistry

All AP Chemistry Resources

Example Questions

Example Question #3 : Reaction Mechanisms

Example Question #4 : Reaction Mechanisms

Example Question #1 : Hess' Law

Example Question #2 : Hess' Law

Example Question #651 : Ap Chemistry

Example Question #652 : Ap Chemistry

Example Question #3 : Hess' Law

Example Question #1 : Properties Of The Equilibrium Constant

Example Question #1 : Properties Of The Equilibrium Constant

Example Question #2 : Properties Of The Equilibrium Constant

All AP Chemistry Resources

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