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Holt - Davis et al - Modern Chemistry 2006 (Homework)

James Finch

Chemistry - HS, section 1st period, Fall 2010

Instructor: Dr. Friendly

Current Score : 6 / 27

Due : Thursday, August 26, 2010 18:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
4 0/3 2 0/6 0/12
Total
6/27 (22.2%)

Description

Here are some textbook questions from Modern Chemistry by Raymond Davis, Regina Frey, Mickey Sarquis, and Jerry Sarquis published by Holt, Rinehart and Winston. 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. 4/4 points All Submissions Notes Question: HoltMChem06 2.P.038.
Question part
Points
Submissions
1 2 3 4
1 1 1 1
1/50 3/50 3/50 1/50
Total
4/4
 
How many significant figures are there in each of the following measurements?
(a) 0.4061 mL
Answer is not case sensitive.
Your answer is correct.
(b) 6000 g
Answer is not case sensitive.
Your answer is correct.
(c) 1.002 40 km
Answer is not case sensitive.
Your answer is correct.
(d) 700. mm
Answer is not case sensitive.
Your answer is correct.


2. –/3 points Notes Question: HoltMChem06 3.P.021.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
How many atoms are there in each of the following?
(a) 2.30 mol Na
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 atoms
(b) 6.729 mol Pb
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 atoms
(c) 6.14 g Si
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 atoms


3. 2/2 points All Submissions Notes Question: HoltMChem06 5.P.025.
Question part
Points
Submissions
1 2
1 1
1/50 1/50
Total
2/2
 
(a) How do the atomic radii of main-group elements vary across a period and down a group? (Select all that apply.)

Your answer is correct.



(b) Explain the basis for each trend. (Select all that apply.)

Your answer is correct.




4. –/6 points Notes Question: HoltMChem06 6.P.019.
Question part
Points
Submissions
1 2 3 4 5 6
0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50
Total
0/6
 
Select the Lewis structures for the following atoms.
(a) boron

(b) phosphorus

(c) chlorine

(d) aluminum

(e) sulfur

(f) oxygen


5. –/12 points Notes Question: HoltMChem06 8.P.014.
Question part
Points
Submissions
1 2 3 4 5 6 7 8 9 10 11 12
0/1 0/1 0/1 0/1 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 0/50 0/50 0/50 0/50
Total
0/12
 
Identify and correct each error in the following equations, and then balance each equation.
Type your answer using the following format:
CuCl2 for CuCl2
If each formula is correct, answer 'none' in the formula box.
2, 2, 1 for 2 H2O 2 H2 + O2
Use the lowest possible coefficients.
(a) Mg + HCl H2 + MgCl
identify each error (Select all that apply.)



corrected formula
Answer is case sensitive.
coefficients for the balanced equation
Answer is not case sensitive.
(b) H2O H2 + 2 O
identify each error (Select all that apply.)



corrected formula
Answer is case sensitive.
coefficients for the balanced equation
Answer is not case sensitive.
(c) NaI + Cl2 NaCl + I
identify each error (Select all that apply.)



corrected formula
Answer is case sensitive.
coefficients for the balanced equation
Answer is not case sensitive.
(d) Mg + 2 F MgF2
identify each error (Select all that apply.)



corrected formula
Answer is case sensitive.
coefficients for the balanced equation
Answer is not case sensitive.

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