Pre Lab Stuff

Hey y'all. Having a good day? I guess not, since you're doing homework right now. Well you should get excited! We're doing a lab soon! YES!!!

POPCORN LAB- PROBABLY THURSDAY!
Pen. ALL pen! No PENCIL!


Popcorn packs come in little plastic packages. Take off the plastic, and mass the pack. Remember-

• this side up!
• Wait until 1 second between pops to stop popping

Clear the extra seconds off the microwave.
Mass at room temperature.
Open the bag a little.
Wait for it to completely cool ROOM temperature!
2 reasons for the kernels that don't pop

• not enough moisture

• hole in kernal
• http://www.rediff.com/getahead/2005/apr/19corn.htm
  

The Microwave was first used for popcorn. Excited the water molecule to boil, turns it to vapor, causes starch to expand. The starch, when cooled, turns to its sold form. We will be calculationg percent water/mositure in the popcorn.

(How Popcorn Works) http://dsc.discovery.com/videos/how-stuff-works-popcorn.html

Table 1
1. Mass of popcorn before popping
2. Mass of popcorn after popping (and cooling)
3. Mass of H2O in popcorn ( 1-2 )
4. % of H2O in popcorn (by mass) ( 3/1 * 100 )


Go to the white board (table 2) and write Group #, and # for data.

Table 2
Group #---Brand of Popcorn---% H2O by Mass
1
-
-
15


After everyone's finished:
1. Calculate Average
2. Calculate standard deviation (http://hubpages.com/hub/stddev)
3. Use your data for % error
4. Google % H2O in popcorn (http://en.wikipedia.org/wiki/Popcorn)

We will pick our own groups

PRE-LAB
Title of Lab

• write under the blue bar.

Purpose of Lab

• finding the percent of water by mass in popcorn.

Materials

• Popcorn Bag, Microwave, Balance Good Attitude

Procedure

• Bullets fine.
  
• Everyone's is different.
  
• Concise.
  
• Easy to follow
• Only lab notebook, pen, calculator, and good attitudes allowed at lab station

Data Tables

• Draw lines around- Use Rulers
• Give yourself Room.
• Double Spaced
• Error Correction- No white out/ Scribble. Draw one line through the incorrect measurement, then write the correct measurement underneath it.

Pre-Lab Questions

• What is the formula for standard deviation?
• Only the answer is needed
  

LAB
See information at Top^ DUH!

POST LAB

Calculations

• Do 'em well
• You can do them outside of class (She actually expects it)

Post Lab Questions

• Just answers needed
• Pg. 64-65
• 2nd one under Conclusions
• Both under extensions

Conclusion

• discusses mistakes made
• did you achieve goals?
• could any improvements be made in this lab?
• Minimum of 3 complete sentences
  

ENTIRE LAB DUE NEXT TUESDAY

Here are some great websites!

http://funnyjunk.com/movies/2219/Popcorn+In+Ultra+Slow+Motion/
http://www.youtube.com/watch?v=9N4ckFN96-k
(^ possibly the greatest video ever posted on this blog ^)

I love you guys. School's tough this year, but persevere.