SBEC Chemistry and Physics

10 Responses to “Chemistry 2-25-09 Moles of Chalk Lab”

1.   jeeen yoon Says:
   February 26th, 2009 at 12:45 PM

   what’s chalk formula?

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   Marissa Newton Reply:
   February 26th, 2009 at 8:11 PM

   Hey Jeeen Yoon, the formula for chalk is calcium carbonate.

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2.   anna knecht Says:
   February 26th, 2009 at 5:33 PM

   JeeEn, Ms. Skinner is talking about the lab we did, not an actual “chalk” formula. We used the Q formula to figure out how many moles were in our name based on the difference of the masses before and after we wrote our name.

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3.   Emily!! Says:
   February 26th, 2009 at 6:21 PM

   Hello! I was wondering, do e have to write the chemical formula after the conversion factor every time we work a molar mass problem?

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4.   Emily!! Says:
   February 26th, 2009 at 6:21 PM

   AAH! I meant we not e.

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5.   macy Says:
   February 26th, 2009 at 7:11 PM

   emily yes you always have to write the formula to get credit for it

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6.   Katie McMurtry Says:
   February 26th, 2009 at 9:11 PM

   I was wondering if we had to memorize the chemical names and formulas of all the things we looked up like chalk, dry ice etc. ?

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7.   Mika D. Says:
   February 26th, 2009 at 9:14 PM

   My original idea for the chalk lab was weigh a piece of paper and subtract that from the total after you wrote your name on it and weighed it again i heard you say it wouldnt work as well, would it still be somewhat close? or would the calculations be way off?

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   Daniel H Reply:
   February 27th, 2009 at 12:47 AM

   no the chalk on the paper idea does not work at all, the paper will actually weigh less when massed after you have written on it. not sure how or why though…

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8.   Macee Rush Says:
   March 3rd, 2009 at 6:34 PM

   for the test do we only have to memorize the polyatomic ions and the acids? just wondering =]
   thanks

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