The Water Chapter
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Questions and Answers

What happens to ice when it gains heat?

  • It remains unchanged
  • It becomes solid water
  • It evaporates to become water vapor
  • It melts to become liquid water (correct)

    • At what temperature does water transition from liquid to solid?

  • 100°C
  • 25°C
  • 0°C (correct)
  • 50°C

    • Which factor does NOT affect the rate of evaporation?

  • Color of the container (correct)
  • Wind strength
  • Temperature
  • Exposed surface area

    • How is evaporation defined?

    <p>The change from liquid to gas</p> Signup and view all the answers

    What effect does increasing temperature have on the rate of evaporation?

    <p>It increases the rate</p> Signup and view all the answers

    How does tepid sponging effectively reduce fever?

    <p>It lowers body temperature through evaporation of water.</p> Signup and view all the answers

    What makes mist fans more effective in cooling the surrounding air compared to regular fans?

    <p>They release tiny water droplets which evaporate.</p> Signup and view all the answers

    Why does a boy feel colder when he exits the water after swimming?

    <p>He loses heat due to evaporation of water from his skin.</p> Signup and view all the answers

    What effect does a strong wind have on the sensation of cold after swimming?

    <p>It accelerates the evaporation, increasing heat loss from the body.</p> Signup and view all the answers

    How do rooftop gardens contribute to cooling a building?

    <p>They allow water to evaporate, which cools the surrounding air.</p> Signup and view all the answers

    What occurs during the BC section of the graph?

    <p>Heat energy is used to melt ice, keeping the temperature constant.</p> Signup and view all the answers

    At what temperature does ice begin to melt into water?

    <p>0°C</p> Signup and view all the answers

    Which graph section shows a constant temperature despite gaining heat?

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

    In which section of the graph does water start changing into steam?

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

    What is the main characteristic of the CD section of the graph?

    <p>The beaker contains only water, and temperature increases.</p> Signup and view all the answers

    What happens when water reaches its boiling point?

    <p>The water undergoes a change to a gaseous state.</p> Signup and view all the answers

    Which statement is true about the AB section of the graph?

    <p>The temperature of ice increases until it reaches 0°C.</p> Signup and view all the answers

    What is the melting point of ice as indicated in the graph?

    <p>0°C</p> Signup and view all the answers

    What is the main process by which seawater is transformed into pure water in Alice's experiment?

    <p>Evaporation followed by condensation</p> Signup and view all the answers

    Why is a beaker with a smaller opening recommended in the water collection setup?

    <p>It reduces the risk of water spilling.</p> Signup and view all the answers

    Which method will NOT increase the amount of pure water collected in Alice's setup?

    <p>Reducing the temperature of the seawater</p> Signup and view all the answers

    What happens to water vapor as it rises into cooler air in the atmosphere?

    <p>It condenses into water droplets.</p> Signup and view all the answers

    Which of the following factors primarily affects the rate of evaporation in the setup?

    <p>Temperature of the environment</p> Signup and view all the answers

    What happens during the PQ phase in the cooling process of the water?

    <p>Water loses heat to the surrounding air.</p> Signup and view all the answers

    At which temperature does water start to freeze?

    <p>0°C</p> Signup and view all the answers

    What is true about the QR phase?

    <p>Water experiences no heat gain or loss.</p> Signup and view all the answers

    What occurs during the RS phase?

    <p>Water loses heat to the cold air in the freezer.</p> Signup and view all the answers

    What characterizes the ST phase of water cooling?

    <p>The temperature remains constant during freezing.</p> Signup and view all the answers

    How does the state of water change after the TU phase?

    <p>All water has frozen into ice.</p> Signup and view all the answers

    Which statement is true about the heat transfer during the cooling of water?

    <p>Heat is lost during the cooling process, both in air and in the freezer.</p> Signup and view all the answers

    What can be concluded about the freezing process of water?

    <p>Freezing involves a constant temperature until all water turns to ice.</p> Signup and view all the answers

    What causes a mirror to become cloudy after a warm shower?

    <p>Warm water vapor condenses on a cooler mirror surface.</p> Signup and view all the answers

    Why do spectacles become misty when leaving an air-conditioned bus?

    <p>Cool spectacles encounter warmer outdoor air.</p> Signup and view all the answers

    What phenomenon causes water droplets to form on the outer surface of a glass of cold drink?

    <p>The outer surface becomes cooler than the surrounding air.</p> Signup and view all the answers

    What explains the formation of water droplets on a car left outdoors overnight?

    <p>The cooler air at night cools the car's surface.</p> Signup and view all the answers

    What creates the 'white mist' observed when breathing out in winter?

    <p>The cooler air condenses warmer water vapor from breath.</p> Signup and view all the answers

    What results in a 'white mist' near the spout of a boiling kettle?

    <p>Steam loses heat to cooler surrounding air.</p> Signup and view all the answers

    Why does a 'white mist' form around popsicles taken out of the freezer?

    <p>Warmer air condenses around the cold popsicles.</p> Signup and view all the answers

    How do water droplets form on the underside of a lid on a pot of hot soup?

    <p>The soup evaporates and cools the lid.</p> Signup and view all the answers

    What physical process is involved when water vapor condenses on a cold surface?

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

    In which scenario do water droplets not form?

    <p>When the surrounding air is warmer than the surface.</p> Signup and view all the answers

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