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Russo and Silver - Introductory Chemistry 2/e (Homework)

Chris Read

Prentice Hall, section 1, Fall 2010

Instructor: Mr. Prentice Hall

Current Score : 0 / 25

Due : Wednesday, November 24, 2010 05:46 PM EST

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Question
Points
1 2 3 4 5
0/8 0/2 0/3 0/4 0/8
Total
0/25

Description

Here are some textbook questions from Introductory Chemistry 2/e by Russo and Silver published by Prentice Hall. Click here for a list of all of the questions coded in WebAssign.


Instructions

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



1. –/8 points Notes Question: RusSil2 2.P.071.
Question part
Points
Submissions
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0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
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0/8
 
Convert the following measured values from scientific notation to normal notation. For each one, indicate the number of significant figures.
(a) 5.63 101 kg
Answer is not case sensitive.
 kg
significant figures
Enter an exact number.
 		(b) 2.3 10-4 m
Answer is not case sensitive.
 m
significant figures
Enter an exact number.
(c) 5.600 106 miles
Answer is not case sensitive.
 miles
significant figures
Enter an exact number.
 		(d) 0.03 102 feet
Answer is not case sensitive.
 feet
significant figures
Enter an exact number.


2. –/2 points Notes Question: RusSil2 3.P.061.
Question part
Points
Submissions
1 2
0/1 0/1
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0/2
 
What element seems poorly placed in group IA, the alkali metals?
Answer is case sensitive.

Why?


3. –/3 points Notes Question: RusSil2 4.P.066.
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
 
(a) How much energy would be necessary to take a hydrogen atom from its ground state to an excited state in which the n = 3 orbit is occupied?
Enter a number.
 eV
(b) What would be the energy of light emitted when the excited atom relaxed back to the ground state?
Enter a number.
 eV
(c) What kind of electromagnetic radiation would be emitted? (Consult Table 4.1.)
    



Table 4.1



4. –/4 points Notes Question: RusSil2 5.P.121.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
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0/4
 
Name the following binary ionic compounds.
(a) Mg3N
Answer is not case sensitive.

(b) BF3
Answer is not case sensitive.

(c) Na2O
Answer is not case sensitive.

(d) MgO
Answer is not case sensitive.


5. –/8 points Notes Question: RusSil2 8.P.060.
Question part
Points
Submissions
1 2 3 4 5 6 7 8
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
Total
0/8
 
Consider the following unbalanced chemical equation.

NO + O2 NO2

(a) Balance the reaction. (Use the lowest possible coefficients.)
Answer is not case sensitive.
NO +
Answer is not case sensitive.
O2
Answer is not case sensitive.
NO2
(b) Translate this reaction into English using the word mole wherever you can.

(c) To produce NO2 by the reaction you just wrote for part (b), how many grams of NO and O2 must you combine? (Use at least one mole of each reactant.)
NO
Enter a number.
 g
O2
Enter a number.
 g
(d) What is the theoretical yield of NO2 from the reaction in part (b)?
Enter a number.
 g
(e) You carry out the reaction in part (b) and recover 20.7 g of NO2. What is the percent yield?
Enter a number.
%

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