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Ebbing and Gammon - General Chemistry 7/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/13

Due: Thursday, September 9, 2010 08:15 EDT

About this Assignment

Question
Points
1 2 3 4 5
0/4 0/4 0/3 0/1 0/1
Total
0/13

Description

Here are some textbook questions from General Chemistry 7/e by Ebbing and Gammon published by Houghton Mifflin. 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. –/4 points Notes Question: EbGam7 1.PP.048.
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Which of the following are pure substances? Which are mixtures? For each, list all of the different phases present.
(a) a sugar solution with sugar crystals at the bottom



(b) ink containing a liquid solution with fine particles of carbon



(c) a sand containing quartz (silicon dioxide) and calcite (calcium carbonate)



(d) liquid water and steam at 100°C




2. –/4 points Notes Question: EbGam7 2.PP.061.
Question part
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0/1 0/1 0/1 0/1
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Give the molecular formula for each of the following structural formulas. (Type your answer using the form H2O for H2O.)
(a)
Answer is case sensitive.

(b)
Answer is case sensitive.

(c)
Answer is case sensitive.

(d)
Answer is case sensitive.


3. –/3 points Notes Question: EbGam7 3.PP.085.
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Methanol, CH3OH, is prepared industrially from the gas-phase catalytic reaction that has been depicted here using molecular models.

In a laboratory test, a reaction vessel was filled with 31.9 g CO and 10.9 g H2.
How many grams of methanol would be produced in a complete reaction?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g
Which reactant remains unconsumed at the end of the reaction?
    


How many grams of it remain?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g


4. –/1 points Notes Question: EbGam7 4.PP.083.
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A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. The reaction is shown below.

5 H2O2(aq) + 2 KMnO4(aq) + 3 H2SO4(aq) 5 O2(g) + 2 MnSO4(aq) + K2SO4(aq) + 8 H2O(l)

It requires 39.1 mL of 0.110 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
%

5. –/1 points Notes Question: EbGam7 5.PP.031.
Question part
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A gas in a closed-tube manometer (Figure 5.4) has a measured pressure of 0.060 atm. Calculate the pressure in mmHg.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 mmHg


Figure 5.4


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