Molecular Energy Quiz
40 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the definition of temperature?

  • The transfer of thermal energy between substances or matter at different temperatures.
  • The manifestation of thermal energy. (correct)
  • The study of quantities of heat and work.
  • The energy involved in the random motions of atoms and molecules.

    • What is thermochemistry concerned with?

  • The identification of matter involved in chemical reactions.
  • The energy involved in the random motions of atoms and molecules.
  • Quantities of heat and work involved in chemical reactions. (correct)
  • The transfer of thermal energy between substances or matter at different temperatures.

    • What is heat?

  • The transfer of thermal energy between substances or matter at different temperatures. (correct)
  • The manifestation of thermal energy.
  • The energy involved in the random motions of atoms and molecules.
  • The study of quantities of heat and work.

    • What is the SI unit of energy?

    <p>Joules (J)</p> Signup and view all the answers

    What are the energy relationships and changes involved in chemical reactions as important as?

    <p>Mass relationships</p> Signup and view all the answers

    Which sign is given for heat absorbed by the system and work done on the system?

    <p>Positive sign (+)</p> Signup and view all the answers

    What is the formula for work in thermodynamics?

    <p>𝑤 = −𝑃∆𝑉</p> Signup and view all the answers

    What is the sign given for heat released by the system and work done by the system?

    <p>Negative sign (-)</p> Signup and view all the answers

    What does the symbol 'P' represent in the formula for work in thermodynamics?

    <p>External opposing pressure</p> Signup and view all the answers

    What does the symbol '∆𝑉' represent in the formula for work in thermodynamics?

    <p>Volume change during work</p> Signup and view all the answers

    Which of the following statements is true regarding the first law of thermodynamics?

    <p>The first law of thermodynamics states that energy can neither be created nor destroyed, but it can be converted from one form to another</p> Signup and view all the answers

    What is the definition of work in thermodynamics?

    <p>Work is the force exerted over a distance</p> Signup and view all the answers

    What is the relationship between the total energy change and heat and work exchanged between the system and surroundings?

    <p>Δ𝐸 = 𝑞 + 𝑤</p> Signup and view all the answers

    What is mechanical work in thermodynamics?

    <p>Mechanical work is the work done by the expansion or compression of a gas fitted with a weightless, movable piston</p> Signup and view all the answers

    What happens to the system if the ∆𝑈𝑠𝑦𝑠𝑡𝑒𝑚 is negative?

    <p>The system has released energy to the surroundings</p> Signup and view all the answers

    What is the main difference between open and closed systems?

    <p>Open systems allow exchange of matter and energy with surroundings, while closed systems only allow exchange of energy but not matter</p> Signup and view all the answers

    What is an endothermic process?

    <p>A chemical reaction that absorbs energy from the surroundings</p> Signup and view all the answers

    What is the first law of thermodynamics?

    <p>Energy cannot be created nor destroyed but can be converted from one form to another</p> Signup and view all the answers

    What are state functions?

    <p>Properties of a system that only depend on the state of the system</p> Signup and view all the answers

    What is the formula for calculating the change in internal energy of a system?

    <p>∆𝑈𝑠𝑦𝑠𝑡𝑒𝑚 = 𝑈𝑓𝑖𝑛𝑎𝑙 − 𝑈𝑖𝑛𝑖𝑡𝑖𝑎𝑙</p> Signup and view all the answers

    What sign is given for work done by the system in thermodynamics?

    <p>Negative</p> Signup and view all the answers

    What is the formula for calculating work done in thermodynamics when pressure and volume change?

    <p>𝑤 = −𝑃∆𝑉</p> Signup and view all the answers

    What is the sign convention for heat absorbed by the system in thermodynamics?

    <p>Positive</p> Signup and view all the answers

    What is the relationship between work done and volume change in thermodynamics?

    <p>Inversely proportional</p> Signup and view all the answers

    What is the sign convention for work done on the system in thermodynamics?

    <p>Positive</p> Signup and view all the answers

    What is the main focus of thermochemistry?

    <p>Quantities of heat and work</p> Signup and view all the answers

    What is the difference between heat and temperature?

    <p>Heat is the transfer of thermal energy, while temperature is the manifestation of thermal energy</p> Signup and view all the answers

    What is thermal energy?

    <p>The energy involved in the random motions of atoms and molecules</p> Signup and view all the answers

    What must be identified before studying the energy changes in chemical reactions?

    <p>The matter involved in the reactions</p> Signup and view all the answers

    What is the definition of the SI unit of energy, Joule (J)?

    <p>The amount of work required to move an object a distance of 1 meter against a force of 1 Newton</p> Signup and view all the answers

    What is the broad concept of work in thermodynamics?

    <p>All of the above</p> Signup and view all the answers

    What is the formula for the first law of thermodynamics?

    <p>Δ𝐸 = 𝑞 + 𝑤</p> Signup and view all the answers

    What determines the potential energy of a system in thermodynamics?

    <p>All of the above</p> Signup and view all the answers

    What is the exact energy change of a system in thermodynamics?

    <p>Cannot be determined</p> Signup and view all the answers

    What is the relationship between energy loss or gain in a system and the surroundings in thermodynamics?

    <p>Energy is gained or lost in the surroundings through heat or other forms of energy</p> Signup and view all the answers

    What is the main difference between closed and isolated systems?

    <p>Closed systems allow transfer of energy but not matter, while isolated systems do not allow any transfer for both matter and energy</p> Signup and view all the answers

    Which of the following is a path function?

    <p>Enthalpy</p> Signup and view all the answers

    What is the relationship between endothermic and exothermic processes?

    <p>Endothermic processes absorb energy from the surroundings, while exothermic processes release energy to the surroundings</p> Signup and view all the answers

    What is the first law of thermodynamics?

    <p>Energy cannot be created nor destroyed but can be converted from one form to another</p> Signup and view all the answers

    What is the formula for calculating the change in internal energy of a system?

    <p>∆𝑈𝑠𝑦𝑠𝑡𝑒𝑚 = 𝑈𝑓𝑖𝑛𝑎𝑙 − 𝑈𝑖𝑛𝑖𝑡𝑖𝑎𝑙</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser