38 LABOEATOEY MANUAL 



to bring each separate quantity to the boiling point. 

 The product of the quantity of water multiplied by the 

 number of degrees its temperature was raised, divided 

 by the number of minutes required for bringing the 

 water to the boiling point, will give you the approxi- 

 mate amount of heat given off by the name per minute. 

 If you make a number of tests as indicated above, the 

 average of the results will give you a more accurate 

 idea of the available heat given off by your flame per 

 minute. 



CHAPTER V 



CHANGES IN THE STATE OF MATTER 



Exercise 15. Change from a Solid to a Liquid. 

 Object : To determine the heat necessary to convert 

 one gram of ice to water. 



Apparatus 



Cracked ice Chemical thermometer 



Balance and weights Bunsen burner 



Hot water Tin beaker 



Ring stand Asbestos cover 



Directions: Surround the tin beaker with the 

 asbestos cover and ascertain the weight of both. Into 

 the beaker pour 200 c.c. of Avater at 60 degrees C. Now 

 obtain the weight of the beaker and water. Break 75 

 grams of ice into small pieces. After noting the exact 

 temperature of the water in the beaker, wipe dry the 

 pieces of ice and drop them into the water piece by 



