X hits on this document

55 views

0 shares

0 downloads

0 comments

19 / 25

AGC/United Learning • 1560 Sherman Ave., Suite 100 • Evanston, IL 60201 • 800-323-9084

SAMPLE IS IGNITED INSIDE THE BOMB. AND THIS BOMB GOES INSIDE THIS CALORIMETER. FROM THERE, WE CAN FIND THE ENERGY CONTENT OF A SAMPLE. SINCE FOOD IS A KIND OF A FUEL, WE CAN FIND THE ENERGY CONTENT OF A WALNUT. LAUREEN: I TOOK THE ALUMINUM FOIL AND MADE A LITTLE CONTAINER WITH THE SHINY SIDE IN. THAT’S TO MAKE SURE THAT THE RADIANT ENERGY FROM THE BURNING WALNUT IS REFLECTED TOWARDS THE TEST TUBE. BRENDON: AND HERE’S WHAT WE KNOW SO FAR. THE MASS OF THE NUT WAS 0.40 GRAMS. I PUT 47 MILLILITERS OF WATER INTO THE TEST TUBE. LAUREEN: WITH AN INITIAL TEMPERATURE OF 16.5 DEGREES CELSIUS. TIME TO LIGHT IT UP. REMY ESTIGOY: FIRST OF ALL, WE HAVE TO PULVERIZE THE WALNUT SAMPLE TO INCREASE THE SURFACE AREA, AND ALSO TO ENSURE A COMPLETE BURNING. AND THEN WE WEIGH THE SAMPLE IN THIS CRUCIBLE, AFTER WHICH WE TRANSFER IT TO THIS BOMB HEAD. WE ATTACH A NICKEL WIRE, AND THE WHOLE BOMB HEAD WILL GO INSIDE THIS BOMB. WE HAVE TO SCREW IT TIGHT AND ADMIT OXYGEN. THE WHOLE BOMB GOES INSIDE THIS BUCKET, AFTER WHICH WE PLACE 2,000 MILLILI- TERS OF WATER. THE WHOLE THING WILL BE GOING INSIDE THIS CALORIMETER. AND WE HAVE TO ATTACH THE ELEC- TRODES, AFTER WHICH WE HAVE TO CLOSE THIS COVER. THE CALORIMETER OBSERVES TEMPERATURE BEFORE, DURING, AND AFTER COMBUSTION OF THE SAMPLE. IT MEASURES TO A PRECISION OF THREE DECIMAL PLACES. LAUREEN: THE WALNUT BURNED, AND SOME OF THE CHEMI- CAL ENERGY OF THE NUT WAS CONVERTED TO THERMAL EN- ERGY AND TRANSFERRED TO THE WATER. BRENDON: THE INITIAL TEMPERATURE OF THE WATER WAS 16.5 DEGREES CELSIUS. THE FINAL TEMPERATURE WAS 45.0 DE- GREES CELSIUS. LAUREEN: THAT’S A TEMPERATURE CHANGE OF 28.5 DEGREES CELSIUS. BRENDON: AND USING THE FORMULA, Q EQUALS MC DELTA T, M IS 47 GRAMS OF WATER.

19

Document info
Document views55
Page views55
Page last viewedFri Dec 02 20:41:15 UTC 2016
Pages25
Paragraphs262
Words6363

Comments