Definition of Fuel and Energy Transformation
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Questions and Answers

What is the process called when a fuel is burned in the presence of an oxidant to release energy?

  • Condensation
  • Evaporation
  • Combustion (correct)
  • Oxidation
  • Why do combustion reactions produce a lot of heat?

  • Due to the formation of water and carbon dioxide
  • Because they are endothermic reactions
  • Because they involve high levels of oxygen
  • As a result of more energy stored in fuel molecules compared to products (correct)
  • What happens to the leftover energy in a combustion reaction?

  • It forms new chemical bonds
  • It is stored in the fuel molecules
  • It is converted into light energy
  • It is released as heat energy (correct)
  • Which molecule is NOT typically formed in a combustion reaction involving hydrocarbons?

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

    What term describes the property of combustion reactions that release heat?

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

    How do fuels like wood, coal, gas, and oil provide heat, light, or power when burned?

    <p>By releasing chemical energy stored in them</p> Signup and view all the answers

    What is the source of energy that wood uses to grow and create sugars like glucose?

    <p>Light energy from the sun</p> Signup and view all the answers

    How did fossil fuels like coal, natural gas, and oil form over millions of years?

    <p>By compression of dead plants, animals, and marine life by sediment and rock</p> Signup and view all the answers

    What is the common origin of the energy contained in all fuels, including fossil fuels like coal and oil?

    <p>Photosynthesis from plants</p> Signup and view all the answers

    What distinguishes fossil fuels like coal and oil from wood in terms of how they acquired their energy?

    <p>They got their energy through compression over millions of years</p> Signup and view all the answers

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