2/28 Chemistry Update and Homework due 3/7

Hi Folks,

Today we did a lab were we used the reaction of baking soda and vinegar to inflate a balloon.  We changed the amount of baking soda that we used while we kept the amount of vinegar the same.  This allowed us to get a little more in touch with the concept of limiting reagents

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After looking at the quiz, it appears that some folks could use a bit more practice with limiting reagents.  So here are 4 questions to help you out with that need.  :)  I've included a .pdf of the answers as well.  These will be due next week.

For many of you, I also HIGHLY recommend going back and taking a look at naming ionic and covalent molecules.  Lots of you guys are still struggling with that.  Best way to do that is to grab some of those old quizzes and test yourself.    Your final grade will thank you.  

1.You combine 10.0 grams of hydrogen gas and 15.0 grams of oxygen gas. How many grams of water vapor are made? Which is the limiting reactant?

2H2 +O2 --> 2H2O

2. If 5.00 grams of copper metal react with a solution containing 20.0 grams of AgNO3, which reactant is limiting and what mass silver is produced? 

2AgNO3 + Cu -->2Ag + Cu(NO3)2

3. 20.0 grams of potassium hydroxide react with 15.0 grams of ammonium sulfate calculate the grams of potassium sulfate produced.

2KOH + (NH4)2SO4 -->  K2SO4 + 2NH4OH

4. In the reaction of chlorine and sodium to form sodium chloride, determine (1) the mass of sodium chloride produced and (b) the amount of excess reactant left if 30.0 grams of chlorine react with 30.0 grams of sodium

2Na + Cl2--> NaCl