Energy In Food

How will we set up the experiment? (Continued) When we have the apparatus set up and we have a weighed nut on the mounted needle, we can start.  We will need to measure the temperature of the water before we start heating it up - remember, we need the temperature change.   Then we can light our Bunsen burners so that we can start the peanuts burning.  Once the peanut catches on fire, we will put it under the test tube and start heating it up.  We keep going until the nut has burned off all its energy.  Then we measure the temperature rise.

 

Temperature rise In the picture on the left, what is the temperature of the water?  ??? 18°C If the peanut's flame causes the temperature to go up to 60°C, by how much would the temperature have increased? ??? 42°C Knowing that there are 25 g of water in the test tube, how much energy (in calories) would have been added? ??? 25 g x 42°C = 1050 cal Why does that number seem too high?  Answer on the next page...

 

 

 

 

<< Previous Page Next Page >>