Heat and Internal Energy
Physics ⇒ Heat and Thermodynamics
Heat and Internal Energy starts at 7 and continues till grade 12.
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Describe the difference between isothermal and adiabatic processes.
Describe what happens to the internal energy of an ideal gas during an isothermal expansion.
Explain why the temperature of a substance does not change during a phase change, even though heat is being added.
Explain why work done by a gas during expansion at constant pressure is given by W = PΔV.
A 100 g sample of water at 20°C is heated to 80°C. The specific heat capacity of water is 4,186 J/kg·K. Calculate the heat absorbed by the water.
A 2 kg block of copper is heated from 20°C to 50°C. The specific heat capacity of copper is 390 J/kg·K. Calculate the amount of heat required.
A gas is compressed by a piston. During the process, 150 J of work is done on the gas and 100 J of heat is released by the gas to the surroundings. What is the change in internal energy of the gas?
A system absorbs 400 J of heat and its internal energy increases by 250 J. How much work is done by the system?
The internal energy of a system can be changed by (1) doing work on the system (2) transferring heat to the system (3) both (1) and (2) (4) neither (1) nor (2)
Which law states that the change in internal energy of a system is equal to the heat supplied to the system minus the work done by the system? (1) Zeroth law of thermodynamics (2) First law of thermodynamics (3) Second law of thermodynamics (4) Law of conservation of mass
Which of the following best defines internal energy? (1) The energy due to the motion and position of an object (2) The total kinetic and potential energy of the molecules within a substance (3) The energy required to raise the temperature of 1 kg of a substance by 1 K (4) The energy transferred due to temperature difference
Which of the following is NOT a method of heat transfer? (1) Conduction (2) Convection (3) Radiation (4) Reflection
Fill in the blank: The amount of heat required to raise the temperature of 1 gram of a substance by 1°C is called its ________.
Fill in the blank: The energy associated with the random motion of molecules in a substance is called ________ energy.
Fill in the blank: The process in which no heat is exchanged with the surroundings is called an ________ process.
Fill in the blank: The total energy of all the molecules in a system is called its ________ energy.
True or False: Heat is a form of energy that is stored within a body.
True or False: In an adiabatic process, there is no heat exchange between the system and its surroundings.
True or False: The first law of thermodynamics is a statement of the conservation of energy principle for thermodynamic systems.
True or False: The internal energy of a system can decrease if the system does work on its surroundings and no heat is supplied.
