Thermodynamics Parts 3/4

The symbol for specific heat is .......

• c
• Q
• m
• t

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q=mc∆t
• Q=mc
• Q= ½mv
• m=QC

What is the symbol for Thermal Energy?

• Q
• t
• m
• C

What unit do you use to measure Thermal Energy?

• J/Kg ºC
• Kg
• ºC
• J

The specific heat of aluminum is 0.21 J/g°C. How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?

• 105 J

• -10.5 J

• 1.05 J

• -105 J

A material was cooled from 100ºC to 40ºC.  What is the temperature change?

• 60ºC
• 40ºC
• -60ºC
• -40ºC

What does temperature measure?

• Heat
• ºC
• Kinetic Energy
• Thermal Energy

If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• -80,371.2

• 44,938.6

• 80,371.2

• 112,575.9

What is Specific Heat?

• The  amount of thermal energy required to increase the temperature of 1kg of a material by 1°C.
  
• The  amount of radiant energy required to increase the temperature of 1kgof a material by 1°C
• The  amount of energy required to increase the temperature of 1kgof a material by 1°C.
• The  amount of friction  required to increase the temperature of 1kgof a material by 1°C.

How much heat is released 72 g of benzene (C₆H₆) changes from liquid to a solid at its freezing point?

Heat fusion = 10.59 Kj/mol

Heat of vaporization = 30.8 Kj/mol

• 9.77 Kj

• -9.77 Kj

• 10.59 Kj

• 30.8 Kj