Gr 8 Natural Sciences Ch 2.2: Changes of state
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Questions and Answers

What is the term for the gaseous state of a substance that is normally a liquid or solid at room temperature?

  • Transformation
  • Energetic
  • Vapour (correct)
  • Vigorous

    • What process involves the transformation of a gas to a liquid?

  • Melting
  • Evaporation
  • Condensation (correct)
  • Boiling

    • What is the term for the process by which a liquid changes to a gas at a temperature below its boiling point?

  • Boiling
  • Evaporation (correct)
  • Melting
  • Freezing

    • What is the result of heating a solid to its melting point?

    <p>It becomes a liquid</p> Signup and view all the answers

    What occurs at a specific temperature called the boiling point?

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

    What is the term for the process by which a solid changes to a liquid?

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

    What is the result of cooling a liquid to its freezing point?

    <p>It becomes a solid</p> Signup and view all the answers

    What is required for matter to change from one state to another?

    <p>The addition or removal of energy</p> Signup and view all the answers

    What happens to the particles of a gas when it cools?

    <p>They slow down and come closer together</p> Signup and view all the answers

    What is an example of condensation?

    <p>Water droplets forming on the outside of a cold glass</p> Signup and view all the answers

    What is the term for the direct change from solid to gas?

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

    What is the term for the direct change from gas to solid?

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

    What happens to the particles of a liquid when it cools and solidifies?

    <p>They slow down and lock into fixed positions</p> Signup and view all the answers

    What is the term for the process of a liquid changing to a gas?

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

    What is the term for the process of a solid changing to a liquid?

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

    What is a measure of the average kinetic energy of a substance's particles?

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

    What is the primary reason for a change of state to occur?

    <p>The gain or loss of energy</p> Signup and view all the answers

    What is the result of cooling a gas?

    <p>It becomes a liquid</p> Signup and view all the answers

    Which of the following processes occurs at a specific temperature?

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

    What is the difference between evaporation and boiling?

    <p>Evaporation occurs at the surface, while boiling occurs throughout the liquid</p> Signup and view all the answers

    What happens to the particles of a solid when it is heated to its melting point?

    <p>They vibrate more vigorously</p> Signup and view all the answers

    What is the result of heating a liquid?

    <p>It becomes a gas</p> Signup and view all the answers

    Which of the following processes involves the transformation of a liquid to a solid?

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

    What is the term for the change in the form, appearance, nature, or character of a substance?

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

    What happens to the particles of a substance when it changes from a solid to a liquid?

    <p>They gain energy and move farther apart</p> Signup and view all the answers

    What is the direct change from gas to liquid called?

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

    What is an example of deposition?

    <p>Frost forming on a cold surface</p> Signup and view all the answers

    What is the term for the process of a liquid changing to a gas?

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

    What occurs when a liquid is heated to its boiling point?

    <p>It boils</p> Signup and view all the answers

    What is the result of cooling a gas to its dew point?

    <p>It condenses</p> Signup and view all the answers

    What happens to the average kinetic energy of a substance's particles when it changes from a liquid to a gas?

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

    What is the term for the process of a solid changing to a liquid?

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

    What is the primary reason for a substance to change from solid to liquid?

    <p>Increase in average kinetic energy of particles</p> Signup and view all the answers

    What happens to the particles of a gas when it is cooled to its dew point?

    <p>They slow down and come closer together</p> Signup and view all the answers

    What is the difference between melting and solidifying?

    <p>Melting involves heating, while solidifying involves cooling</p> Signup and view all the answers

    What is the relationship between the temperature of a substance and the kinetic energy of its particles?

    <p>As temperature increases, kinetic energy increases</p> Signup and view all the answers

    What is an example of a process that involves both condensation and deposition?

    <p>Frost forming on a cold window</p> Signup and view all the answers

    What is the difference between boiling and evaporation?

    <p>Boiling occurs at the surface of a liquid, while evaporation occurs throughout the liquid</p> Signup and view all the answers

    What is the result of cooling a gas to a temperature below its dew point?

    <p>The gas will condense into a liquid</p> Signup and view all the answers

    What is the relationship between the state of matter and the kinetic energy of its particles?

    <p>Gases have the highest kinetic energy, followed by liquids, and then solids</p> Signup and view all the answers

    What is the primary reason for the particles of a solid to break free from their fixed positions during the melting process?

    <p>The particles gain energy and vibrate more vigorously.</p> Signup and view all the answers

    What is the result of cooling a liquid to a temperature below its freezing point?

    <p>The liquid turns into a solid.</p> Signup and view all the answers

    What is the difference between evaporation and boiling in terms of the location of the phase change?

    <p>Evaporation occurs at the surface, while boiling occurs throughout the liquid.</p> Signup and view all the answers

    What is the result of heating a liquid to a temperature above its boiling point?

    <p>The liquid turns into a gas.</p> Signup and view all the answers

    What is the term for the process of a gas changing to a liquid when it cools to a temperature below its dew point?

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

    What is the result of heating a solid to a temperature below its melting point?

    <p>The solid remains in its solid state.</p> Signup and view all the answers

    What is the primary reason for a change of state to occur?

    <p>The particles gain or lose energy.</p> Signup and view all the answers

    What is the term for the transformation of a liquid to a solid?

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

    What is the primary reason for a substance to change from one state to another?

    <p>The substance gains or loses energy</p> Signup and view all the answers

    What occurs when a liquid is heated to its boiling point?

    <p>Bubbles form throughout the liquid and rise to the surface</p> Signup and view all the answers

    What is the difference between evaporation and boiling?

    <p>Evaporation occurs only at the surface, while boiling occurs throughout the liquid</p> Signup and view all the answers

    What happens to the particles of a solid when it is heated to its melting point?

    <p>They vibrate more vigorously and break free from their fixed positions</p> Signup and view all the answers

    What is the result of cooling a gas to its dew point?

    <p>The particles condense and change into a liquid</p> Signup and view all the answers

    What happens to the average kinetic energy of particles during condensation?

    <p>It decreases</p> Signup and view all the answers

    Which process occurs when the temperature of a substance is below its melting point?

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

    What is the result of heating a solid to its melting point?

    <p>It melts</p> Signup and view all the answers

    Which process occurs when a gas changes to a solid without going through the liquid phase?

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

    What is the primary reason for a change of state to occur?

    <p>A change in temperature</p> Signup and view all the answers

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