Friday, November 9, 2012

Earth science Mass of a rubber stopper


Do not write on this handout, make an RD in your notebook, the FD will be on a separate sheet(s) of paper one for each student.

 

Title:  Just how much Rubber is in a Rubber Stopper?

           

Question:  How will the rubber stopper’s actual metric mass compare (more, less or same mass) to the converted mass taken from posted English standard measurements?

 

Hypothesis:  The Rubber stopper’s actual mass will be________________ then/as the posted mass.

 

Test:  By using a metric balance to determine the actual mass of a Rubber stopper, we can convert ounces to grams for the posted mass and compare to the actual mass found using a scale.

 

Materials:  metric balance (triple beam pan balance), rubber stoppers of varying size, (calculator)

 

Procedures:

  1. Convert the posted mass from oz → g using the following formula 1oz. = 28.3 g 
  2. Take the mass measurement of the rubber stopper on the metric balance.
  3. Do this for four different rubber stoppers with different posted masses (each table member should do all parts of the experiment for at least one sinker)
  4. Subtract the measured mass in grams from the posted mass in grams to determine the relative error.  You may disregard any negative numbers9 take an absolute value of your result).
  5. Take the relative error in grams and divide by the converted posted mass, in grams, and multiply by 100 to determine the percent error.

 

Data:

Rubber stopper #
Posted mass
Converted (g)
Measured mass
(g)
Relative Error
% error
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Observations: 

 

 

Analysis:  include your calculations and math work for doing the oz-g conversions, relative and percent error. 

Make a Bar graph of actual versus converted mass values of the rubber stoppers used.

 

 

 

 

Conclusion: (restate the hypothesis, explain how you answered the question or not and compare numeric results to prove or refute your hypothesis, discuss observations as possible errors and propose a next step and who outside of this science class might care about your results)

Thursday, November 1, 2012

ES volumetrics 3* data

object Accepted values 3* 400ml  pb/250ml gb/100ml gc
1* 157 cm3 grp 1 grp 2 grp 3 grp 4 grp 5 grp 6 grp 7 grp 8 grp 9
2* 159 cm3 ML ML ML ML ML ML ML ML ML
3* 140 cm3 #1 160/175/155 160/175/155 180/150/157 180/150/152 160/150/153
4* 165 cm3 #2 180/175/155 160/150/158 160/150/159 180/150/158 160/150/156/
5* 251  cm3 #3 120/150/140 160/150/141
6* 237 cm3 #4 140/125/100 160/150/137 140/125/133/
7* 160 cm3 #5 260/250/252 280/275/246 280/250/247 260/250/253/
8* 257 cm3 #6 260/250/235 240/250/236 240/225/234 240/200/200 240/250/228 240/250/221/
9* 249 cm3 #7 160/175/158 180/150/161 160/150/160 160/150/130 180/150/162 160/175/156 160/150/153/
#8 280/275/255 260/250/2583 260/250/258 280/250/284 260/250/252/
#9 250/225/245 260/250/242 260/250/264 240/250/244 240/250/220 260/250/248/
relative error = accepted value - measured average

ES volumetrics class data 5*

object Accepted values 5* 400ml  pb/250ml gb/100ml gc
1* 157 cm3 grp 1 grp 2 grp 3 grp 4 grp 5 grp 6 grp 7 grp 8 grp 9
2* 159 cm3 object ML ML ML ML ML ML ML ML ML
3* 140 cm3 #1 160/175/155 160/175/155 180/150/157 180/150/152 160/150/153
4* 165 cm3 #2 180/175/155 160/150/158 160/150/159 180/150/158 160/150/156/
5* 251  cm3 #3 120/150/140 160/150/141
6* 237 cm3 #4 140/125/100 160/150/137 140/125/133/
7* 160 cm3 #5 260/250/252 280/275/246 280/250/247 260/250/253/
8* 257 cm3 #6 260/250/235 240/250/236 240/225/234 240/200/200 240/250/228 240/250/221/
9* 249 cm3 #7 160/175/158 180/150/161 160/150/160 160/150/130 180/150/162 160/175/156 160/150/153/
#8 280/275/255 260/250/2583 260/250/258 280/250/284 260/250/252/
#9 250/225/245 260/250/242 260/250/264 240/250/244 240/250/220 260/250/248/
relative error = accepted value - measured average
for 400 ml plastic beaker
Ex #5: 251 - 260 = -9 

ES volumetrics class data 1*

object Accepted values 1* 400ml  pb/250ml gb/100ml gc
1* 157 cm3 grp 1 2 3 4 5 6 7 8 9
2* 159 cm3 ML ML ML ML ML ML ML ML ML
3* 140 cm3 #1 160/150/157 160/125/152 140/154/154
4* 165 cm3 #2 160/150/157 160/150/159
5* 251  cm3 #3 140/150/140 140/125/134 140/150/142 160/175/174
6* 237 cm3 #4 140/150/125 120/125/134
7* 160 cm3 #5 260/300/300 240/250/255 260/250/252
8* 257 cm3 #6 240/225/238 240/250/232
9* 249 cm3 #7 160/150/165 160/175/162 160/150/160
#8 260/250/255 260/250/257 260/250/255 260/250/255
#9 240/250/248 260/275/245 260/225/242 240/250/247 240/250/145
relative error = accepted value - measured average