Change in States of Water
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Questions and Answers

At what temperature does ice begin to melt?

  • 100°C
  • -1°C
  • 32°F
  • 0°C (correct)

    • What effect does anti-fog spray have on water vapor?

  • It freezes the water vapor.
  • It repels water completely.
  • It prevents water droplets from forming. (correct)
  • It evaporates the water vapor.

    • During the boiling process, what happens to the temperature of water?

  • It remains constant. (correct)
  • It fluctuates randomly.
  • It decreases steadily.
  • It increases steadily.

    • What is the critical temperature that indicates the boiling point of water?

    <p>100°C</p> Signup and view all the answers

    What happens to the temperature when ice is melting?

    <p>It remains constant.</p> Signup and view all the answers

    Which apparatus is essential for recording temperature in the experiment?

    <p>Alcohol thermometer</p> Signup and view all the answers

    What is the purpose of stirring the ice and water before taking thermometer readings?

    <p>To ensure even temperature distribution.</p> Signup and view all the answers

    What happens to ice when it is left at room temperature?

    <p>It undergoes a change to water at its melting point.</p> Signup and view all the answers

    At what temperature does ice melt into water?

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

    Which statement correctly describes the particles in the solid state of water?

    <p>They are closely packed and arranged in a regular pattern.</p> Signup and view all the answers

    Which process describes the change from water to ice?

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

    What state of water is described as water vapor?

    <p>Gas state</p> Signup and view all the answers

    What happens to water droplets on the outside of a glass of iced water?

    <p>They condense from the air.</p> Signup and view all the answers

    Which of the following is NOT a state of water?

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

    How does spraying mists into the air help lower the surrounding temperature?

    <p>It facilitates evaporative cooling.</p> Signup and view all the answers

    What happens to water when it melts?

    <p>It absorbs energy from the surroundings.</p> Signup and view all the answers

    At what temperature does water transition from a liquid to a gas during boiling?

    <p>100 °C</p> Signup and view all the answers

    Which of the following processes involves the release of energy?

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

    Why do our hands feel cooler when we rub alcohol on them?

    <p>Alcohol absorbs more energy from the skin than water.</p> Signup and view all the answers

    What is the primary reason mists from a spraying machine lower surrounding temperatures?

    <p>The mists evaporate and absorb energy from the air.</p> Signup and view all the answers

    Which statement is true regarding the energy changes during evaporation?

    <p>Evaporation absorbs energy at temperatures below boiling point.</p> Signup and view all the answers

    What is the correct independent variable when graphing the temperature of water against time?

    <p>Time (min)</p> Signup and view all the answers

    During the freezing process of water, what is occurring?

    <p>Water changes from liquid to solid while releasing energy.</p> Signup and view all the answers

    What occurs at the melting point of ice?

    <p>Ice absorbs energy without temperature change.</p> Signup and view all the answers

    During the melting process, what happens to the temperature of ice?

    <p>It remains constant at the melting point</p> Signup and view all the answers

    What characteristic of crushed ice contributes to its faster melting compared to cubed ice?

    <p>Larger surface area</p> Signup and view all the answers

    What change occurs to water when it reaches the boiling point?

    <p>Water converts into steam without a temperature change</p> Signup and view all the answers

    What happens to the temperature of water when it is cooled to the freezing point?

    <p>It remains constant while freezing</p> Signup and view all the answers

    How should the y-axis be labeled in the graph of temperature against time?

    <p>Temperature (°C)</p> Signup and view all the answers

    Which of the following statements about energy during phase changes is accurate?

    <p>Energy is absorbed without change in temperature</p> Signup and view all the answers

    At what temperature does water boil and change into steam?

    <p>100 °C</p> Signup and view all the answers

    What process involves the change of water from a liquid to a gas below its boiling point?

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

    Which of the following describes the change from steam to water?

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

    Which of the following statements is incorrect regarding freezing?

    <p>Freezing changes gases directly into liquids.</p> Signup and view all the answers

    What effect does sunlight have on rainwater on the road?

    <p>It facilitates evaporation.</p> Signup and view all the answers

    What is the primary reason for glasses fogging up when leaving an air-conditioned space?

    <p>Condensation of water vapor on cold surfaces.</p> Signup and view all the answers

    Which state change is described as occurring at or below the boiling point?

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

    Which process converts ice directly into water vapour without passing through the liquid state?

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

    Study Notes

    Change in States of Water

    • Water exists in three states: solid (ice), liquid (water), and gas (water vapor).
    • The mist-spraying machine lowers surrounding temperature by spraying water mist into the air, causing evaporation.
    • Evaporation is the change from liquid to gas. It occurs at temperatures below boiling point.
    • Melting is the change from solid to liquid. Ice melts at 0°C (freezing point).
    • Freezing is the change from liquid to solid. Water freezes at 0°C (melting point).
    • Boiling is the change from liquid to gas. Water boils at 100°C (boiling point).
    • Condensation is the change from gas to liquid. Steam (water vapor) condenses to form water when cooled.
    • Temperature remains constant during changes of state. Energy is either absorbed from or released to the surroundings.

    Processes of Change in Water

    • Water exists in three physical states: solid (ice), liquid (water), and gas (water vapor).
    • The physical states are characterized by the arrangement of water particles.
    • Solid particles are closely packed in a regular pattern. Liquid particles are closely packed, but not arranged regularly. Gas particles are far apart.

    Practical 2.1: Heating Ice to Steam

    • Aim: To study the change in temperature when ice is heated to steam.
    • Apparatus/materials: Alcohol thermometer, beaker, Bunsen burner, insulating mat, tripod, wire gauze, gas lighter, stand/clamp, crushed ice,
    • Procedure: Set up the apparatus, make sure the alcohol thermometer does not touch the bottom of the beaker, light the Bunsen burner, record thermometer readings every minute, turn off the burner after water boils for two minutes, stir the water/ice before taking temperature readings
    • Results: Record time (min) and temperature (°C) in a table.
    • Discussion:
      • When ice melts, temperature does not change.
      • When water boils, temperature does not change.
    • Graph: Draw a line graph of temperature against time, using results obtained.

    Skill Builder 2.1: Drawing Line Graphs

    • Line graphs show the relationship between two variables.
    • Steps for drawing a line graph:
      1. Title the graph.
      2. Place independent variable on x-axis, dependent variable on y-axis.
      3. Choose a suitable scale for the graph axes, using the available space.
      4. Mark the points (data from the table) on the graph.
      5. Connect the points with a line or a smooth curve.

    Skill Practice 2.1

    • Procedure: Repeat experiment in practical with water/ice, record time (min) and temperature (°C).
    • Draw a line graph of temperature against time.
    • The graph shows the change of temperature in ice and water when heated or cooled.

    Additional Notes

    • Anti-fog sprays contain chemicals that prevent water droplets from forming on surfaces, instead allowing the water to condense into a thin water film.
    • Alcohol feels cool when rubbed on the skin due to its quick evaporation, which absorbs energy from the skin.

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    Related Documents

    Change in States of Water PDF

    Description

    This quiz explores the various states of water and the processes involved in changing from one state to another. It covers key concepts such as melting, freezing, boiling, evaporation, and condensation, along with their respective temperatures. Test your understanding of these important physical transformations of water.

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