Gr 8 Natural Sciences Ch 2.2: What is the particle model of matter?
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Questions and Answers

What is a scientific theory?

  • A well-substantiated explanation of some aspect of the natural world based on a body of evidence and repeated experiments (correct)
  • A law that governs the natural world
  • A guess or hunch about the natural world
  • A hypothesis that has not been tested

    • What is the main idea of the particle model of matter?

  • Only gases are made up of particles
  • Only solids are made up of particles
  • Matter is made up of large particles
  • Matter is made up of incredibly small particles (correct)

    • What is true about the spaces between particles in the particle model of matter?

  • The spaces are filled with air
  • The spaces are empty (correct)
  • The spaces are filled with a unknown substance
  • The spaces are only present in gases

    • What happens to the movement of particles as energy increases?

    <p>The movement of particles increases</p> Signup and view all the answers

    What is true about the arrangement of particles in a solid?

    <p>Particles are closely packed in a fixed, orderly arrangement</p> Signup and view all the answers

    What type of experiment is used to isolate the effects of a variable?

    <p>Controlled experiment</p> Signup and view all the answers

    What is the term for an observable event or fact?

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

    What happens to the particles in a solid?

    <p>They vibrate but do not move from their fixed positions</p> Signup and view all the answers

    What is the main difference between particles in a solid and particles in a liquid?

    <p>Particles in a liquid are farther apart than in a solid.</p> Signup and view all the answers

    What happens to particles during the process of evaporation?

    <p>Particles gain energy and break free from the liquid state.</p> Signup and view all the answers

    What is the term for the change of state from a solid to a gas without becoming a liquid?

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

    What is the main reason why the particle model of matter is useful?

    <p>It explains the properties of different states of matter.</p> Signup and view all the answers

    What is the purpose of conducting controlled experiments in science?

    <p>To test hypotheses and understand phenomena.</p> Signup and view all the answers

    What happens to particles during the process of condensation?

    <p>Particles lose energy and come closer together.</p> Signup and view all the answers

    What is the term for the change of state from a gas to a solid without becoming a liquid?

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

    What is the main characteristic of particles in a gas?

    <p>Particles are far apart and move randomly.</p> Signup and view all the answers

    What is a key feature of the particles in the particle model of matter?

    <p>They are incredibly small</p> Signup and view all the answers

    What is the main difference between particles in a liquid and particles in a solid?

    <p>Particles are farther apart in a liquid</p> Signup and view all the answers

    What happens to the forces between particles as the state of matter changes from solid to liquid?

    <p>They become weaker</p> Signup and view all the answers

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

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

    What is a characteristic of particles in a gas?

    <p>They are in random motion</p> Signup and view all the answers

    What happens to the movement of particles when the temperature increases?

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

    What is true about the arrangement of particles in a liquid?

    <p>It is disordered</p> Signup and view all the answers

    What is the term for reversing a change of state, such as going from a liquid to a solid?

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

    What is the primary reason particles in a liquid have a definite volume but an indefinite shape?

    <p>Particles move more freely than in solids.</p> Signup and view all the answers

    Which process involves the transition of a solid directly to a gas without becoming a liquid?

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

    What happens to the energy of particles during the process of melting?

    <p>Particles gain energy and move more freely.</p> Signup and view all the answers

    What is the primary purpose of controlled experiments in understanding the particle model of matter?

    <p>To test hypotheses and understand phenomena.</p> Signup and view all the answers

    What is the result of particles losing energy during the process of condensation?

    <p>Particles come closer to form a liquid.</p> Signup and view all the answers

    Which of the following is a characteristic of particles in a solid?

    <p>Particles have a fixed arrangement and move very little.</p> Signup and view all the answers

    What happens to particles during the process of freezing?

    <p>Particles lose energy and settle into fixed positions.</p> Signup and view all the answers

    Why is the particle model of matter useful in predicting the behavior of matter?

    <p>It explains the properties of different states of matter.</p> Signup and view all the answers

    What is the primary characteristic of the particles in the particle model of matter?

    <p>They are incredibly small.</p> Signup and view all the answers

    What is the main reason why particles in a solid do not move from their fixed positions?

    <p>Because the forces between particles are strong.</p> Signup and view all the answers

    What happens to the forces between particles as the state of matter changes from solid to liquid?

    <p>They become weaker.</p> Signup and view all the answers

    What is the main difference between particles in a solid and particles in a gas?

    <p>Particles in a solid are more closely packed than particles in a gas.</p> Signup and view all the answers

    What is the purpose of the particle model of matter?

    <p>To understand how matter behaves and interacts in different conditions.</p> Signup and view all the answers

    What is a key feature of the particles in a liquid?

    <p>They have a definite volume but an indefinite shape.</p> Signup and view all the answers

    What happens to the movement of particles when the temperature increases?

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

    What is true about the arrangement of particles in a gas?

    <p>They are random and disordered.</p> Signup and view all the answers

    What is the primary reason particles in a liquid have a definite volume?

    <p>Because particles are close together but not in a fixed arrangement.</p> Signup and view all the answers

    What happens to the forces between particles as the state of matter changes from solid to liquid?

    <p>Forces between particles decrease.</p> Signup and view all the answers

    What is the primary purpose of using controlled experiments in understanding the particle model of matter?

    <p>To observe changes in the state of matter under controlled conditions.</p> Signup and view all the answers

    What is the result of particles gaining energy during the process of evaporation?

    <p>Particles gain enough energy to break free from the liquid state.</p> Signup and view all the answers

    What is the main difference between particles in a solid and particles in a liquid?

    <p>Particles in a solid are closer together and have a fixed arrangement, while particles in a liquid are close together but not in a fixed arrangement.</p> Signup and view all the answers

    What is true about the movement of particles in a gas?

    <p>Particles move randomly and rapidly.</p> Signup and view all the answers

    What is the primary reason the particle model of matter is useful in understanding changes of state?

    <p>Because it explains the properties of different states of matter.</p> Signup and view all the answers

    What happens to the arrangement of particles during the process of freezing?

    <p>Particles lose their energy and settle into fixed positions.</p> Signup and view all the answers

    What is the primary difference between the particle model of matter and other scientific models?

    <p>It explains the structure and behavior of matter in all three states.</p> Signup and view all the answers

    Which of the following best describes the arrangement of particles in a solid, liquid, and gas?

    <p>Ordered and uniform in solids, disordered in liquids, and random in gases.</p> Signup and view all the answers

    What is the primary reason why the particles in a solid are closely packed?

    <p>The forces between particles are strong.</p> Signup and view all the answers

    What happens to the energy of particles during the process of condensation?

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

    What is the primary characteristic of the particles in a gas?

    <p>They are widely spaced and moving rapidly.</p> Signup and view all the answers

    What is the primary difference between the particles in a liquid and a gas?

    <p>The particles in a liquid are closely packed, while those in a gas are widely spaced.</p> Signup and view all the answers

    What is the primary purpose of using the particle model of matter?

    <p>To understand the behavior of matter in all three states.</p> Signup and view all the answers

    What is the primary reason why the particle model of matter is useful in predicting the behavior of matter?

    <p>It provides a well-substantiated explanation of the behavior of matter in all three states.</p> Signup and view all the answers

    What is the primary reason for the difference in volume between a solid and a liquid?

    <p>The particles in a solid are more closely packed than in a liquid.</p> Signup and view all the answers

    What is the primary reason particles in a gas move rapidly and freely?

    <p>The forces between particles are very weak.</p> Signup and view all the answers

    What is the primary reason the particle model of matter is useful in predicting the behavior of matter under different conditions?

    <p>It allows us to predict the behavior of matter under different temperatures and pressures.</p> Signup and view all the answers

    What is the primary reason particles in a solid do not move from their fixed positions?

    <p>The forces between particles are strong.</p> Signup and view all the answers

    What is the primary reason the particle model of matter is useful in understanding changes of state?

    <p>It describes the changes of state and the energy involved.</p> Signup and view all the answers

    What is the primary reason particles in a liquid have a definite volume but an indefinite shape?

    <p>The particles are closely packed but not fixed.</p> Signup and view all the answers

    What is the primary reason the particle model of matter is useful in explaining the properties of different states of matter?

    <p>It helps us understand why solids are rigid and liquids flow.</p> Signup and view all the answers

    What is the primary reason scientists use controlled experiments to test hypotheses about the particle model of matter?

    <p>To isolate the effects of a single variable on the behavior of matter.</p> Signup and view all the answers

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