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Brady, Russell, Holum - Chemistry: Study of Matter (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 9/21

Due: Friday, August 20, 2010 08:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
1 8/12 0/1 0/5 0/2
Total
9/21

Description

Here are some textbook questions from Chemistry: The Study of Matter and its Changes 3/e by Brady, Russell, and Holum published by John Wiley & Sons, Inc. Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submission and allows you to try another version of the same question for practice.



1. 1/1 points All Submissions Notes Question: BRH3 1.P.080.
Question part
Points
Submissions
1
1
1/50
Total
1/1
 
A glass apparatus contains 34.723 g of water when filled at 25°C. At this temperature, water has a density of 0.99704 g/mL. What is the volume of this apparatus?
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. mL


2. 8/12 points All Submissions Notes Question: BRH3 2.P.135.
Question part
Points
Submissions
1 2 3 4 5 6 7 8 9 10 11 12
0/1 1 1 0/1 1 1 0/1 1 1 0/1 1 1
2/50 1/50 1/50 2/50 1/50 1/50 2/50 1/50 2/50 2/50 1/50 1/50
Total
8/12
 
How many electrons, protons, and neutrons are in each of the following particles?
(a) 8034Se2-
Enter an exact number.
Your answer is incorrect. electrons
Enter an exact number.
Your answer is correct. protons
Enter an exact number.
Your answer is correct. neutrons
(b) 14055Cs+
Enter an exact number.
Your answer is incorrect. electrons
Enter an exact number.
Your answer is correct. protons
Enter an exact number.
Your answer is correct. neutrons
(c) 8438Sr2+
Enter an exact number.
Your answer is incorrect. electrons
Enter an exact number.
Your answer is correct. protons
Enter an exact number.
Your answer is correct. neutrons
(d)219F -
Enter an exact number.
Your answer is incorrect. electrons
Enter an exact number.
Your answer is correct. protons
Enter an exact number.
Your answer is correct. neutrons


3. –/1 points Notes Question: BRH3 3.P.120.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
14.86 mL of an aqueous sulfuric acid solution is neutralized by 26.04 mL of 0.1024 M NaOH. The reaction is given below.

2 NaOH(aq) + H2SO4(aq) Na2SO4(aq) + 2 H2O

What is the molarity of the solution?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 M H2SO4


4. –/5 points Notes Question: BRH3 4.P.056.
Question part
Points
Submissions
1 2 3 4 5
0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50
Total
0/5
 
Suppose that you wished to prepare copper(II) carbonate by a precipitation reaction involving Cu2+ and CO32-. Which of the following pairs of reactants could you use as solutes?
(a) Cu(OH)2 + Na2CO3
    



(b) CuSO4 + (NH4)2CO3
    



(c) Cu(NO3)2 + CaCO3
    



(d) CuCl2 + K2CO3
    



(e) CuS + NiCO3
    



5. –/2 points Notes Question: BRH3 5.P.065.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
A 1.362 g sample of an iron ore that contained Fe3O4 was dissolved in acid and all the iron was reduced to Fe2+. The solution was then acidified with H2SO4 and titrated with 39.42 mL of 0.0311 M KMnO4, which oxidized the iron to Fe3+. The net ionic equation for the reaction is shown below.

5 Fe2+ + MnO4- + 8 H+ 5 Fe3+ + Mn2+ + 4 H2O

(a) What was the percentage by mass of iron in the ore?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
%
(b) What was the percentage by mass of Fe3O4 in the ore?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
%

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