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NC AP Chemistry Project (Homework)

James Finch

Chemistry - HS, section 1st period, Fall 2011

Instructor: Dr. Friendly

Current Score : 3 / 8

Due : Saturday, October 1, 2011 18:00 EDT

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Question
Points
1 2 3 4 5
1 2 0/1 0/1 0/3
Total
3/8 (37.5%)

Assignment Submission

For this assignment, the number of submissions for each answer box is counted independently. The number of submissions remaining changes only if you submit a new or changed answer.

1. 1/1 points All Submissions Notes Question: ncchemap 2.001.
Question part
Points
Submissions
1
1
2/50
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1/1
 
If the mass of the metal cylinder pictured below is 18.45 g, calculate the density of the cylinder.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is correct. g/cm3


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2. 2/2 points All Submissions Notes Question: ncchemap 3.003.
Question part
Points
Submissions
1 2
1 1
1/50 2/50
Total
2/2
 
The amu is the abbreviation of what quantity?
Answer is not case sensitive.
Your answer is correct.
How is its value defined?

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3. 0/1 points All Submissions Notes Question: ncchemap 14.015.
Question part
Points
Submissions
1
0/1
1/50
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0/1
 
HNO2(aq) H1+(aq) + NO21-(aq)     K1
2 NH3(aq) + 2 H2O(l) 2 NH41+(aq) + 2 OH1-(aq)     K2
H2O(l) H1+(aq) + OH1-(aq)     K3
NH3(aq) + HNO2(aq) 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.
Enter a mathematical expression.
Click here to preview your answer.Your answer is incorrect.
Click here for help with symbolic formatting.
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4. –/1 points Notes Question: ncchemap 16.010.
Question part
Points
Submissions
1
0/1
0/50
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0/1
 
HCO31- + H2O 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 Notes Question: ncchemap 17.024.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
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0/3
 
Calculate G° 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)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 kJ
(b) Cr2O72-(aq) + 14 H1+(aq) + 6 Fe2+(aq) 2 Cr3+(aq) + 6 Fe3+(aq) + 7 H2O(l)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 kJ
In which directions are these reactions spontaneous? (Select all that apply.)


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