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Glencoe Chemistry: Concepts and Applications (Homework)

James Finch

Chemistry - HS, section 1st period, Fall 2010

Instructor: Dr. Friendly

Current Score : 3 / 12

Due : Wednesday, August 18, 2010 18:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
3/5 0/2 0/3 0/1 0/1
Total
3/12 (25.0%)

Description

Here are some textbook questions from Glencoe Chemistry: Concepts and Applications ©2002 published by Glencoe/McGraw-Hill. Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and makes the answer key available after the first submission so you can see the correct answers. (Typically, the answer key is posted after the due date!)



1. 3/5 points All Submissions Notes Question: GChemCA02 1.17.uc.
Question part
Points
Submissions
1 2 3 4 5
1 1 1 0/1 0/1
1/50 1/50 1/50 1/50 1/50
Total
3/5
 
Are the following physical changes or chemical changes?
(a) Water boils.
    

Your answer is correct.


(b) A match burns.
    

Your answer is correct.


(c) Sugar dissolves in tea.
    

Your answer is correct.


(d) Sodium reacts with water.
    

Your answer is incorrect.


(e) Ice cream melts.
    

Your answer is incorrect.



2. –/2 points Notes Question: GChemCA02 2.27.ac.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
An atom with a mass number of 45 has three more neutrons than protons. What is the atomic number of this atom?
Answer is not case sensitive.

What is the atom's identity?
Answer is case sensitive.


3. –/3 points Notes Question: GChemCA02 3.12.uc.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
An incomplete set of atomic mass, density, and melting point data is given for three elements in a triad. Following the patterns of Dobereiner's triads, predict a likely number for each missing value.

K (density)
Enter a number.
 g/mL
Rb (atomic mass)
Enter a number.
 u
Cs (melting point)
Enter a number.
 K

4. –/1 points Notes Question: GChemCA02 4.16.uc.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
The term isoelectronic is used to describe atoms and ions that have the same number of electrons. Which of the following are isoelectronic?




5. –/1 points Notes Question: GChemCA02 5.16.ac.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Paintings discovered in a limestone cave in Lascaux, France, in 1940 were a popular tourist attraction until authorities sealed the cave to protect the paintings. Prior to the discovery of the artwork from thousands of years ago, the cave was well sealed from the atmosphere. Suggest a reason why opening the cave sped up the deterioration of the paintings.



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