Energy and Thermodynamics Concepts
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Questions and Answers

What is energy?

  • The ability to do work or produce heat (correct)
  • Stored energy
  • Energy due to motion
  • Energy that is radiated

    • What is potential energy?

    Stored energy that results from the position or composition of an object.

    What is kinetic energy?

    The energy an object has due to its motion.

    Define heat (q).

    <p>The energy transferred between objects that are at different temperatures.</p> Signup and view all the answers

    What does temperature (T) measure?

    <p>A measure of the average energy of motion of the particles of a substance.</p> Signup and view all the answers

    What is meant by a system in chemistry?

    <p>A group of parts that work together as a whole.</p> Signup and view all the answers

    What are surroundings?

    <p>Everything outside the system.</p> Signup and view all the answers

    What is an endothermic process?

    <p>Energy flows INTO a system from the surroundings.</p> Signup and view all the answers

    What is an exothermic process?

    <p>Energy flows OUT of a system into the surroundings.</p> Signup and view all the answers

    Describe an endothermic equation.

    <p>Reactants + heat -&gt; products.</p> Signup and view all the answers

    Describe an exothermic equation.

    <p>Reactants -&gt; products + heat.</p> Signup and view all the answers

    Breaking bonds __________ energy (endo).

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

    Making bonds __________ energy (exo).

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

    Substances that absorb and radiate heat QUICKLY have a __________ specific heat capacity.

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

    Substances that absorb and radiate heat SLOWLY have a __________ specific heat capacity.

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

    What is the heat capacity of water?

    <p>4.184 J/g°C, which is high.</p> Signup and view all the answers

    How many calories (c) are in a Calorie (C)?

    <p>1000</p> Signup and view all the answers

    What does the formula q = mc∆T represent?

    <p>q = heat (J, kJ or cal), m = mass (g), c = specific heat (J/g°C), ∆T = temperature change.</p> Signup and view all the answers

    What is the process of gas to liquid called?

    <p>Condensation.</p> Signup and view all the answers

    What is the process of liquid to gas called?

    <p>Evaporation.</p> Signup and view all the answers

    What is the process of liquid to solid?

    <p>Freezing or solidification.</p> Signup and view all the answers

    What is the process of solid to liquid called?

    <p>Melting.</p> Signup and view all the answers

    What is the process of solid to gas called?

    <p>Sublimation.</p> Signup and view all the answers

    What is the process of gas to solid called?

    <p>Deposition.</p> Signup and view all the answers

    What is radiation?

    <p>Energy that is radiated or transmitted in the form of rays or waves or particles.</p> Signup and view all the answers

    What is convection?

    <p>The transfer of thermal energy by the circulation or movement of a liquid or gas.</p> Signup and view all the answers

    What is conduction?

    <p>The direct transfer of heat from one substance to another that it is touching.</p> Signup and view all the answers

    Define specific heat capacity (c).

    <p>The energy required to raise the temperature of one gram of a substance by one degree Celsius.</p> Signup and view all the answers

    (Convection currents in the mantle) Hot magma __________ while cooler magma __________.

    <p>rises, sinks</p> Signup and view all the answers

    Study Notes

    Energy Concepts

    • Energy is the capacity to perform work or produce heat.
    • Potential energy is the stored energy originating from the position or composition of an object.
    • Kinetic energy is the energy of an object due to its motion.

    Heat and Temperature

    • Heat (symbol q) refers to energy transferred between objects at different temperatures, moving from hot to cold.
    • Temperature (T) is the average energy of motion of particles in a substance.

    Systems and Surroundings

    • A system is a collection of components working together, with a specific focus.
    • Surroundings encompass everything outside the system being studied.

    Thermodynamic Processes

    • Endothermic reactions involve energy flowing into a system from its surroundings, resulting in a gain of potential energy (+q).
    • Exothermic reactions involve energy flowing out of a system to its surroundings, leading to a loss of potential energy (-q).

    Reaction Equations

    • The endothermic equation format is Reactants + heat → Products.
    • The exothermic equation format is Reactants → Products + heat.

    Bond Formation and Energy

    • Breaking bonds requires energy (endothermic process).
    • Making bonds releases energy (exothermic process).

    Specific Heat Capacity

    • Substances with low specific heat capacity absorb and radiate heat quickly.
    • Substances with high specific heat capacity absorb and radiate heat slowly.
    • Water's specific heat capacity is 4.184 J/g°C, indicating it is high.

    Caloric Values

    • There are 1000 calories (c) in one Calorie (C).

    Heat Transfer Equation

    • The equation q = mcΔT represents heat transfer, where:
      • q = heat (in Joules, kJ, or calories)
      • m = mass (in grams)
      • c = specific heat (in J/g°C)
      • ΔT = change in temperature

    Phase Changes

    • Condensation refers to the transition from gas to liquid.
    • Evaporation is the transition from liquid to gas.
    • Freezing or solidification describes the transition from liquid to solid.
    • Melting indicates the transition from solid to liquid.
    • Sublimation is the transition from solid to gas.
    • Deposition is the transition from gas to solid.

    Energy Transfer Methods

    • Radiation is the transfer of energy via rays, waves, or particles (e.g., heat from fire).
    • Convection is the transfer of thermal energy through the movement of liquids or gases (e.g., atmospheric wind currents).
    • Conduction involves direct heat transfer between substances in contact (e.g., touching a hot surface).

    Convection Currents

    • In the mantle, hot magma rises while cooler magma sinks, creating convection currents.

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    Description

    Test your knowledge on fundamental energy concepts, thermodynamic processes, and the distinctions between heat and temperature. This quiz covers key definitions and equations relevant to chemistry and physics. Assess your understanding of systems and surroundings in thermodynamics.

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