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NC AP Chemistry Project (Homework)

James Finch

Chemistry - HS, section 1st period, Fall 2019

Instructor: Dr. Friendly

Current Score : 4 / 8

Due : Tuesday, October 1, 2019 18:00 EDT

Last Saved : n/a Saving...  ()

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4/8 (50.0%)

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1. –/1 points ncchemap 2.001. My Notes
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If the mass of the metal cylinder pictured below is 18.45 g, calculate the density of the cylinder.
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2.81

 g/cm3

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2. –/2 points ncchemap 3.003. My Notes
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The amu is the abbreviation of what quantity?
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atomic mass unit -or- the atomic mass unit
How is its value defined?
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Key: It is defined as 1/12 of the mass of a carbon-12 atom.

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3. –/1 points ncchemap 14.015. My Notes
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HNO2(aq) equilibrium reaction arrow H1+(aq) + NO21-(aq)     K1
2 NH3(aq) + 2 H2O(l) equilibrium reaction arrow 2 NH41+(aq) + 2 OH1-(aq)     K2
H2O(l) equilibrium reaction arrow H1+(aq) + OH1-(aq)     K3
NH3(aq) + HNO2(aq) equilibrium reaction arrow NH41+(aq) + NO21-(aq)     K4

Express the equilibrium constant K4 in terms of the other equilibrium constants given. Type your answer using the symbols K1, K2 and K3 as appropriate.
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K1 * K2^0.5 * K3^-1
Click here for help with symbolic formatting.
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4. –/1 points ncchemap 16.010. My Notes
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HCO31- + H2O equilibrium reaction arrow H3O+ + CO32-

Which of the following are a conjugate acid-base pair in the above reaction? (Select all that apply.)

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5. –/3 points ncchemap 17.024. My Notes
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Calculate ΔG° for each of the following reactions. Use the standard reduction potentials in these Reference Tables. Enter your answers to three significant figures.
(a) 2 NO31-(aq) + 8 H1+(aq) + 3 Cu(s) 2 NO(g) + 3 Cu2+(aq) + 4 H2O(l)
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-359

 kJ
(b) Cr2O72-(aq) + 14 H1+(aq) + 6 Fe2+(aq) 2 Cr3+(aq) + 6 Fe3+(aq) + 7 H2O(l)
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-324

 kJ
In which directions are these reactions spontaneous? (Select all that apply.)

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