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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: sweetie on November 06, 2008, 11:31:55 AM

Title: General chemistry
Post by: sweetie on November 06, 2008, 11:31:55 AM

Hi,
I need some help with my homework...
here it is:
Your measured height in cm was different from the calculated height in cm. Why is this statement true?

and:
when you calc. the density of your round metal cylinders, how did you determine the cylinder's volume?

Title: Re: General chemistry
Post by: Astrokel on November 06, 2008, 11:44:08 AM

I believe it is about uncertainty in your measurement. Have you learnt about that?

Title: Re: General chemistry
Post by: sweetie on November 06, 2008, 12:14:59 PM

yea is did actually, i looked at my previous labs and figured it out. can u helpme with this one instead, it has me for a loop.:
calc. the amount of thermal energy necessary to raise the temp of a salt/ice water mixture at 12 degrees C to constant evaporation at 103 degrees C. specific heat C of water is 1.00 cal/gram degree. /\  T <--(that on the left is suppost to be a triangle) is temp. change.

cal=mass (grams) (c) ( /\ T )