THERMAL ENERGY -PHYSICS 11

Convert 50 degrees Celsius to Fahrenheit.

• 122°F

• 100°F

• 212°F

• 140°F

What is specific heat capacity?

• The amount of heat required to raise the temperature of 1 liter of a substance by 1 degree Celsius

• The amount of heat required to raise the temperature of 1 kilogram of a substance by 1 degree Celsius

• The amount of heat required to raise the temperature of 1 mole of a substance by 1 degree Celsius

• The amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius

A 100 g sample of iron is heated from 20°C to 100°C, requiring 4000 J of heat. What is the specific heat capacity of iron?

• 0.50 J/g°C

• 0.40 J/g°C

• 0.80 J/g°C

• 1.0 J/g°C

Which substance would require the most energy to raise the temperature of a given mass by 1°C?

• Lead

• Copper

• Water

• Aluminum

If the latent heat of vaporization of water is 2260 J/g, how much heat is required to completely vaporize 50 grams of water?

• 113 J

• 2260 J

• 113000 J

• 5650 J

A thermodynamic process in which the internal energy of a system remains constant is called:

• Isochoric process

• Isobaric process

• Isothermal process

• Adiabatic process

A gas expands against a constant external pressure of 2 atm. If the gas does 100 J of work and releases 150 J of heat, what is the change in internal energy?

• -250 J

• -50 J

• 50 J

• 250 J

Which type of heat transfer does not require a medium to occur?

• Conduction

• Convection

• Radiation

• Insulation

Which statement regarding latent heat capacity is correct?

• It is always positive

• It is always negative

• It can be positive or negative depending on the substance and the phase change

• It is always zero

If a 50 g sample of water at 20°C is heated with 5000 J of energy, what is the final temperature of the water?(Specific heat capacity of water = 4.18 J/g°C)

• 25°C

• 30°C

• 40°C

• 50°C