Wednesday, January 6, 2010

QUIZ THURSDAY Jan 7th

chem quiz !! study up.
I've put up helpful review powerpoints on my slideshare acct.
www.slideshare.net/mrkalember

here's an old practice quiz.



SHOW ALL WORK !! (use unit analysis)

When sodium reacts with water it forms sodium hydroxide and hydrogen gas.

2Na + 2 H2O YIELDS 2NaOH + H2

1. If you want to react 12 atoms of Na it will require _____ molecules of water and it will make _______ FU’s NaOH and _______ molecules of H2

2. If 50 grams of sodium is mixed with 30 grams water, which is in excess?

3. How much NaOH will be made ? ______________ grams

4. How much hydrogen gas will be made? ____________ grams

5. How much hydrogen gas will be made? ____________ liters

6. How much of the reactant which is in excess will be LEFT OVER? _________ g

7. If you had 2.5 grams Na reacting with EXCESS water, how many mole hydrogen gas will be made?

Extra credit – If you made 12 liters of hydrogen gas, how many ATOMS of sodium reacted with excess water? Show work !

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