Comprehensive Chemistry Final
Directions:  This is a take home final.  You may work on it at your own pace, it is due Friday, July 9.  It is open source, so you may use your notes, texts, and me.  You may not work with one another on this.  However, if you do not understand a particular concept you may seek aid with that concept, not the problem.  Show all your work.

Atoms

What is the difference between an ion and an isotope?
 
 
 
 

Which elements are diatomic?
 
 
 

What does the atomic number tell us about the structure of a particular atom?
 
 
 
 

What does the atomic mass tell us about the structure of a particular atom?
 
 
 
 
 

Electron shells

What is electronegativity?
 
 
 
 
 
 

Describe or illustrate the pattern of electronegativity across the periodic table.
 
 
 
 

Why are the elements in the last column of the periodic table called “noble gases”?  What causes them to exhibit this behavior?
 
 
 
 

Grams-moles

You have 100 gra
ms of magnesium oxide in a crucible.  How many moles are there?
 
 
 
 
 

How much would 4 moles of water weigh?
 
 
 
 
 

Balancing equations

Balance the following equations:

H2 + N2  ->  NH3
 
 
 

Ca(OH)2 + HNO3  ->  Ca(NO3)2 + H2O
Acids and bases

Give an example of an acid.  What defines this molecule as an acid?
 
 
 
 
 

What is the pH of 0.0001 M HCl solution?
 
 
 
 
 

What do buffers do?  Explain using a graph of a titration using a buffer.  (Label the axes.)
 
 
 
 
 

Solutions

How many moles of NaCl are necessary to make 2.5 L of 1.25 M solution?
 
 
 
 
 

Gas laws (don’t forget your conversions)

A gas occupies 11.2 liters at 0.860 atm. What is the pressure if the volume becomes 15.0 L?
 
 
 
 
 
 
 
 

A gas has a volume of 800.0 mL at minus 23.00 C and 300.0 torr. What would the volume of the gas be at 227.0 C and 600.0 torr of pressure?
 
 
 
 
 
 
 

How many moles of gas would be present in a gas trapped within a 100.0 mL vessel at 25.0 C at a pressure of 2.50 atmospheres?
 
 
 


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