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Properties of Water- Thermal quiz

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  • What is kinetic energy?
    Kinetic energy is the energy of motion, referring to the movement of molecules or substances.
  • How is temperature defined in terms of molecular motion?
    Temperature is defined as the average kinetic energy of molecules in a sample.
  • What does a high temperature indicate about the motion of molecules?
    A high temperature means that the molecules in the sample have a high average motion and are moving quickly.
  • How does thermal energy differ from temperature?
    Thermal energy is the total kinetic energy of molecules transferred as heat, while temperature is the average kinetic energy.
  • Why does a swimming pool have more thermal energy than a hot coffee pot, even if its temperature is lower?
    Because the swimming pool has a much larger volume and more molecules, its total thermal energy is higher despite a lower temperature.
  • What is specific heat?
    Specific heat is the amount of heat energy required to raise or lower one gram of a substance by one degree Celsius.
  • Why does water resist temperature changes?
    Water resists temperature changes because it has a high specific heat, requiring a lot of energy to change its temperature.
  • How does water's high specific heat benefit living organisms?
    It helps maintain homeostasis by allowing cells to resist rapid temperature changes, keeping internal conditions stable.
  • What is the heat of vaporization?
    Heat of vaporization is the amount of heat energy required to convert one gram of a liquid into its gaseous state.
  • Why does water have a high heat of vaporization?
    Water has a high heat of vaporization due to the abundance of hydrogen bonds between its molecules in the liquid state.
  • What must happen to water molecules for liquid water to become water vapor?
    A large amount of energy must be applied to break the hydrogen bonds between water molecules, allowing them to escape as vapor.
  • How does water's high heat of vaporization help maintain life?
    It helps keep water in its liquid state, which is essential for life and maintaining homeostasis.
  • What happens to hydrogen bonds when water vaporizes?
    The hydrogen bonds between water molecules are broken, allowing the molecules to move freely as gas.
  • Why doesn't water boil immediately when heated on a stove?
    Because water's high specific heat means it takes a significant amount of energy to raise its temperature to boiling.
  • How does water's thermal property affect the freezing process?
    Water takes a long time to freeze because its high specific heat requires a lot of energy to be removed to lower its temperature.