MONDAY, MARCH 21, 2005

 

LAST MINUTE QUESTIONS ON ENERGY PROJECT

 

REVIEW HEAT QUESTIONS/PACKET 1

 

NOTES:

 

         How is energy used during a phase change?

 

 

 

         Write down and explain observations (time, sound, movement) of:

 

 

         Water boiling from start to finish:

 

 

 

 

 

 

 

         Water freezing to ice:

 

 

 

 

 

 

 

 

 

HEAT ENERGY TAKEN IN ΔQ =

 

TempRise mCΔT = mass (kg) * C (Specific Heat in J/(kg C) ) * (Tf-Ti) in C

+

Phase Change (evap) mHv = mass (kg)* HeatVaporization (J/kg)  OR

                       (melt) mHf = mass (kg) * heatFusion (J/kg)

+

Work? = FΔD or PΔV (Pressure in N/m2 * Volume Change in  m3 )

 

Two Objects together

 

     Heat Given Off = Heat Taken In