ࡱ;   R FX-0CompObj\WordDocument[ObjectPool-0-0  FMicrosoft Word 6.0 DocumentNB6WWord.Document.6;  Oh+'0& , 8 DPX `l LScience F:Applications:Microsoft Office:Microsoft Word 6:Templates:chem labLAB: TITLE OF LABsciencescience'@+0@v@0u-0ܥhO e[ 4VVVVVn xV/V      &X~/ @/ 69Lab: HEAT AND THE CALORIE  Introduction When heat is absorbed by liquid water, the temperature of water rises. The amount of heat necessary to raise the temperature of one gram of water by one degree Centigrade is reasonably constant between 8oC and 80oC. Consequently, it provides a simple and reproducible basis for a definition of a standard amount of heat, the calorie. The CALORIE is the amount of heat to raise the temperature of one gram of water one degree centigrade. Conversely, one calorie is released as one gram of water is cooled one degree centigrade. (1 cal= 4.184 J) The purpose of this lab is to use this knowledge of the calorie to determine the heat of combustion per gram of candle wax. You will weigh a candle before you burn it. You will allow water to capture the heat from the burning candle. You will then weigh the candle at the end of the experiment. Calculate the amount of heat gained by the water and divide by the amount of candle wax that was burned to obtain the calories per gram of wax. MATERIALS 1 short candle and a small piece of foil or cardboard 1 small coffee can with holes punched to allow a glass rod through 1 large can with top and bottom removed 1 glass rod 1 thermometer Procedure 1. Weigh a candle to the nearest 0.01 g. Record this weight in your data table. 2. Weigh the small can to the nearest 0.01 g and record its weight. 3. Fill the coffee can one-fourth to one-third full of water and weigh it again to the nearest 0.01 g. Also slip the glass rod through the holes and place the thermometer in the water and take the temperature of the water to the nearest 0.1oC. 4. Stand the candle on the small piece of cardboard and light it. Quickly, but carefully place the large open can around the burning candle and then suspend the small can directly over the candle. The glass rod will overlap the outer can and hold the inner can in place. 5. Heat the water, stirring gently until the temperature rises 10 - 15oC above the initial temperature. Record the highest temperature reached to the nearest.0.1 o. 6. Weigh the candle after burning to the nearest 0.01 gram. Data MASS OF CANDLE BEFORE BURNING (G)MASS OF EMPTY COFFEE CAN (G)MASS OF COFFEE CAN AND WATER (G)INITIAL TEMPERATURE OF WATER (C)FINAL TEMPERATURE OF WATER (C)MASS OF CANDLE AFTER BURNING (G) Calculations 1. Calculate the mass of the candle burned. 2. Calculate the mass of water in the coffee can. 3. Calculate the temperature change of the water. 4. Calculate the calories of heat absorbed by the water? (Where did this heat come from?) 5. Calculate the heat of combustion of candle wax in calories per gram of wax. Analysis Write a conclusion HEATS Name: _______________________ Partner #1: _______________________ Partner #2: _______________________ Acton-Boxborough Regional High School Due Date: ______________________ Acton-Boxborough Regional High School  |HH(EG(HH(d'p|HH(EG(HH(d'p |HH(EG(HH(d'p00&ta0`0(00&00&00&00&00&ࡱ; SummaryInformation(@Microsoft Word 6.0.13; *d e   ] ` a f ? @ N 4Y~uuU]cU]c]h]uD]a UZ]c( UZ]c('*+OP3  K/sh x  [ \ ] ^ _ ` f g $$$,$$$$$$$$$$$$$$$$,$,$,$l H$h'    2 3 4 5 6 7 8 9 : ; < = > ? M N z { | C D E $$$$$$$$$$$$,$,$$$$$$$$$$$$$$$hl H$( 34{|}~$$$$$$$$$$$$$$$$$$,$$T$T$$$ 0 !l h !s0h !shK@Normal]a "A@"Default Paragraph Font @ Header ! @ Footer !*O"* Chem HeaderL UZ]c^ 6K^= ou   `? UE9science.Science F:Teacher Folders:Murphree:CANDLE/HEAT@  >VMTimes New Roman Symbol MArial MTimesMNew Century Schlbk"1h;F;F!~KScience F:Applications:Microsoft Office:Microsoft Word 6:Templates:chem labLAB: TITLE OF LABsciencescienceࡱ;