11.1 Temperature and Thermal Energy
What is absolute zero on the Fahrenheit scale?
- 0 °F
- 32 °F
- -273.15 °F
- -459.67 °F
What is absolute zero on the Celsius scale?
- 0 °C
- 273.15 °C
- -459.67 °C
- -273.15 °C
What is the difference between the freezing point and boiling point of water on the Reaumur scale?
- The boiling point of water is 80° on the Reaumur scale.
- Reaumur scale is less than 120°.
11.2 Heat, Specific Heat, and Heat Transfer
In the specific heat equation what does c stand for?
- Total heat
- Specific heat
- Specific temperature
- Specific mass
Specific heat may be measured in J/kg · K, J/kg · °C. What other units can it be measured in?
- kg/kcal · °C
- kcal · °C/kg
- kg · °C/kcal
- kcal/kg · °C
Give an example of convection found in nature.
- heat transfer through metallic rod
- heat transfer from the sun to Earth
- heat transfer through ocean currents
- heat emitted by a light bulb into its environment
Calculate the temperature change in a substance with specific heat 735 J/kg · °C when 14 kJ of heat is given to a 3.0-kg sample of that substance.
- 57 °C
- 63 °C
- 1.8×10-2 °C
- 6.3 °C
Aluminum has a specific heat of 900 J/kg·ºC. How much energy would it take to change the temperature of 2 kg aluminum by 3 ºC?
- 1.3 kJ
- 0.60 kJ
- 54 kJ
- 5.4 kJ
11.3 Phase Change and Latent Heat
Upon what does the required amount of heat removed to freeze a sample of a substance depend?
- The mass of the substance and its latent heat of vaporization
- The mass of the substance and its latent heat of fusion
- The mass of the substance and its latent heat of sublimation
- The mass of the substance only
What do latent heats, Lf and Lv, depend on?
- Lf and Lv depend on the forces between the particles in the substance.
- Lf and Lv depend on the mass of the substance.
- Lf and Lv depend on the volume of the substance.
- Lf and Lv depend on the temperature of the substance.
How much energy is required to melt 7.00 kg a block of aluminum that is at its melting point? (Latent heat of fusion of aluminum is 380 kJ/kg.)
- 54.3 kJ
- 2.66 kJ
- 0.0184 kJ
- 2.66×103 kJ
A 3.00 kg sample of a substance is at its boiling point. If 5,360 kJ of energy are enough to boil away the entire substance, what is its latent heat of vaporization?
- 2,685 kJ/kg
- 3,580 kJ/kg
- 895 kJ/kg
- 1,790 kJ/kg