Thermodynamics & Thermochemistry MCQs
Thermodynamics is the study of energy, heat, and work, while thermochemistry focuses on heat changes in chemical reactions. A system refers to the specific part of the universe under study, while everything else is the surroundings. Systems are classified into open, closed, and isolated systems based on energy and matter exchange. Understanding these concepts is essential in chemistry, physics, and engineering, impacting fields like energy production, reaction kinetics, and industrial processes.
- In thermodynamics, the system refers to:
(a) The entire universe
(b) The part of the universe under study
(c) The surroundings of an experiment
(d) A closed container only - Which of the following is considered the surroundings in thermodynamics?
(a) The part of the universe under study
(b) Everything outside the system
(c) The system itself
(d) The reaction components only - Which of the following best describes an open system?
(a) It allows only energy exchange
(b) It allows only matter exchange
(c) It allows both matter and energy exchange
(d) It does not allow any exchange - A closed system allows the exchange of:
(a) Only matter
(b) Only energy
(c) Both matter and energy
(d) Neither matter nor energy - Which of the following is an example of an isolated system?
(a) A boiling pot of water
(b) A thermos flask
(c) An open beaker of acid
(d) A car radiator - Which system exchanges neither matter nor energy with its surroundings?
(a) Open system
(b) Closed system
(c) Isolated system
(d) Thermodynamic system - What kind of system is a pressure cooker while cooking?
(a) Open system
(b) Closed system
(c) Isolated system
(d) Dynamic system - Which statement is true about an open system?
(a) It does not exchange heat with surroundings
(b) It allows both heat and mass exchange
(c) It only allows work to be done on the system
(d) It is always at thermal equilibrium - A thermodynamic system where energy is exchanged but mass remains constant is called:
(a) Open system
(b) Closed system
(c) Isolated system
(d) Dynamic system - Which of the following is NOT an example of an open system?
(a) A steaming cup of coffee
(b) A person sweating
(c) A sealed soda bottle
(d) A burning candle - Which term refers to the total energy of a system?
(a) Work
(b) Heat
(c) Internal energy
(d) Temperature - Which of the following is an example of a closed system?
(a) A hot cup of tea left in an open room
(b) A sealed container of gas
(c) A car engine
(d) A lake - Which of the following is a characteristic of an isolated system?
(a) It does not exchange energy or matter
(b) It allows heat exchange only
(c) It allows only matter exchange
(d) It is always in chemical equilibrium - The first law of thermodynamics is based on the principle of:
(a) Conservation of energy
(b) Conservation of mass
(c) Conservation of volume
(d) Conservation of temperature - A reaction taking place in a closed container is an example of a:
(a) Closed system
(b) Open system
(c) Isolated system
(d) Adiabatic system - Which of the following is an extensive property of a system?
(a) Temperature
(b) Pressure
(c) Volume
(d) Density - Which of the following is an intensive property of a system?
(a) Mass
(b) Internal energy
(c) Pressure
(d) Enthalpy - Which type of system does not allow heat transfer?
(a) Open system
(b) Closed system
(c) Isolated system
(d) Dynamic system - Which of the following best describes a thermodynamic system?
(a) A region of space that includes only matter
(b) A part of the universe that interacts with surroundings
(c) A system that must always be at equilibrium
(d) A system that does not follow the laws of energy conservation
Answer Key
- (b) The part of the universe under study
- (b) Everything outside the system
- (c) It allows both matter and energy exchange
- (b) Only energy
- (b) A thermos flask
- (c) Isolated system
- (b) Closed system
- (b) It allows both heat and mass exchange
- (b) Closed system
- (c) A sealed soda bottle
- (c) Internal energy
- (b) A sealed container of gas
- (a) It does not exchange energy or matter
- (a) Conservation of energy
- (a) Closed system
- (c) Volume
- (c) Pressure
- (c) Isolated system
- (b) A part of the universe that interacts with surroundings