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Explain the difference between a saturated solution and a concentrated solution. 

Identify the BrØnsted base in this reaction.  H2O (l) + HNO3 (aq)  –>  H3O+ (aq)  + NO3- (aq)

Ozone has the formula O3.  Which statement is correct concerning ozone?

Write  1) complete Ionic equation ( 4pts)  and 2) net ionic equation ( 4pts)  for this neutralization reaction: H2SO4 (aq)  + 2KOH(aq) –> K2SO4(aq)  + 2H2O(l)   All work must be shown for credit. No work=no credit. All work must in your own hand-writing.  

The following 4 Essay questions require you to submit your work.  All work must be in your own handwriting.  The use of electronic devices, including writing tablets is not allowed.  No work= No credit.  Work must be neat and legible. If I cannot read it, you will not receive credit for it.  

A 25.0 mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.  What is the concentration of HBr is the unknown sample? *hint- find the concentration of the base first. The answer must have the correct significant figures ( 1 pt) and unit ( 1 point) . Circle your final answer.  All work must be shown for credit. No work=no credit. All work must in your own hand-writing.  

A chemist prepares an aqueous solution of sodium hydroxide.  The solution contains 263.3 g of NaOH and has a volume of 750.0mL.  What is the molarity (moles/liter) of this solution? M=mols/L Answer with correct unit (1 point) and correct significant figures ( 1 point) All work must be shown for credit. No work=no credit. All work must in your own hand-writing.  

The mixture of gas and air inside a cylinder reacts, releasing 400 kJ of total energy.  If the system does 250 kJ of work on the piston, how much energy is released as heat? 

What is the formal charge on the oxygen atom in: CH3O   (Hint: Draw out the molecule with the correct valence electrons)

A small Oreo Dairy Queen® blizzard contains [x] kilocalories of stored chemical energy.  What is this energy in kilojoules?   1cal= 4.184 joules