Lab 2 E

               Today in class, we had an exciting lab on determining the thickness(height) of the aluminum foil.The lab was to help us get more familiar with sig figs, accuracy, precision, uncertainties and the formula of density.  Thus we all enjoy this super amazing lab!!!

Purpose: Find accurate and precise measurement of the thickness of the aluminnum foil expressed using correct number of sig figs.

Procedure

1. We start off by measureing all measuring the length and width of foil that is at least 15 cm on each side

2. Than we use the centigram to measure the mass of each foil.

3. After we calculated the Mass we than use the density formula to calculate the volume of the foil.

4. When we finished calculating the volume of the aluminum foil, we than use the lengh and width to calculate

the height because LxWxH=V

eg.V=0.36cm^3

L=15.60cm

W=15.35cm

Hight=0.36cm^3

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15.60cm*15.35cm

=1.5*10^-3(Remember  round you sig figs till the very end!!)

5.  The final step is for us to calculate the experimental error when it comes to the accepted value for thickness of the aluminum foil which Mr.Chen gave us was 1.55*10^-3.

Formula Expremental error:

Experimental error=Your measurement-Accepted value

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accepted value *100

6.At the end of the experiment we wrote a conclusion on how accurate and precise

our messurement was.  Our measurement was precise because our experimental error

was only 3.2%. It was also precise because we got almost the same value each

time when we calcute the thickness of the foil for 3 trials.

Need more help go to:   http://www.mefeedia.com/watch/29045208

Note:Quiz next class on everything we done today on the lab !!!!