a rubber band
Material: empty soda aluminum can                                          matches
              water                                                         measuring cup
              fork                                                           a bag of cheetos
              a thermometer ( you may borrow one from school : FIRST COME, FIRST SERVED)
                                              
              

Experiment: Pour 200 ml of water in the soda can. Measure the temperature of the water
           and record. With the help of a rubber band attach the can to a tap on the top
           of the sink. Place one cheetos at the end of the fork and light it on fire!
           Be cautious!   Place the burning cheetos under the can to heat up the water.
           Try to keep the cheetos under the can to collect a maximum of the heat
           released. When the whole cheetos has burnt, measure the temperature of
           the water and record.
 
 

PEASE PRINT THIS REPORT AND COMPLETE.   Name:_______________Block:____

        Calculations:       Temperature of the water before heating:__________
                                      Temperature of the water after heating:  __________

             1. Calculate the heat gained by the water (c= sp.heat cap. of water =   4.18  J/ g C ; heat= m c Dt )
 
 

            2. Determine the heat produced by the combustion of one cheetos
                        (1 cal = 4.187 joules ;heat gained by water=heat lost by cheetos)
                                                                        _____________   joules

                                                                        _____________   cal

                                                                       ______________kcal or Cal
 

            3. Read the label , determine the energy content of one serving of cheetos , and compare
                your experimental result to the theoritical value .  _______________ cheetos

                                       _____________joules         ______________Cal ( kcal)

            4.. Calculate your percent error

                    % error =   [ theoritical value- experimental value]  X  100  =
                                                   theoritical value
 
 

                                =  ______________________=   ______________%
 
 
 
 

           5. Explain the difference:   _________________________________________________
                ___________________________________________________________________
               ___________________________________________________________________
 
 
 
 

           6. When you drink a glass of icy water ( water+ ice cubes) your body has to warm up the
                water from 0  degrees  celsius to   36.5  degrees celsius... and spend energy  for it.
               Calculate the energy it takes your body to warm up a  regular 250 ml glass of icy water.(heat= m c dt)
                ( remember:c= sp. heat cap of water=  4.18 J/g C )

                                                                                                            ____________Joules
 
 
 

                                                                                                           ____________ Cal ( Kcal)

           7. Determine the number of glasses of water you will need to drink in such a way that you
                will burn all the joules or Calories provided by one serving of cheetos.
 

 
                                                                                                             ____________glasses.
 
 
 
 

EVIDENCE  :   Now that you have done this extra effort, you are entitled to earn an
            extra point on your grand total) IF

                ---- your answers are correct

                ----you bring your report  in class on or before the last wednesday of the six weeks!

                ----you staple the empty cheetos bag to you report