Gr 8 Natural Sciences Ch 2.2: Density and states of matter
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Questions and Answers

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

  • It becomes zero
  • It increases
  • It decreases (correct)
  • It remains the same

    • Why does ice float on water?

  • Because ice is more dense than water
  • Because ice has a different shape than water
  • Because ice is less dense than water (correct)
  • Because ice is heavier than water

    • What happens to the particles when a gas condenses into a liquid?

  • They come closer together (correct)
  • They change shape
  • They disappear
  • They move further apart

    • What is the purpose of measuring the mass and volume of the solid, liquid, and gas in the experiment?

    <p>To calculate their densities</p> Signup and view all the answers

    Why is water a unique substance?

    <p>Because its solid form is less dense than its liquid form</p> Signup and view all the answers

    What is the effect of increasing the temperature on the density of a substance?

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

    How is the volume of the gas estimated in the experiment?

    <p>By using water displacement</p> Signup and view all the answers

    What does density measure?

    <p>How much mass is contained in a given volume</p> Signup and view all the answers

    What is the formula to calculate the density of a substance?

    <p>Mass / Volume</p> Signup and view all the answers

    What is the unit of measurement for mass?

    <p>Grams or kilograms</p> Signup and view all the answers

    What is the arrangement of particles in a solid?

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

    What is the density of a metal cube?

    <p>High density</p> Signup and view all the answers

    What is the arrangement of particles in a liquid?

    <p>Particles are close together but can move around each other</p> Signup and view all the answers

    What is the density of water in its liquid state?

    <p>Moderate density</p> Signup and view all the answers

    What is the arrangement of particles in a gas?

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

    What is the density of air?

    <p>Low density</p> Signup and view all the answers

    What is the main reason for the difference in density between solid and liquid states of a substance?

    <p>The arrangement of particles in the two states</p> Signup and view all the answers

    Which of the following states of matter has the lowest density?

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

    What is the purpose of the experiment in comparing the densities of different states of matter?

    <p>To understand the differences in particle arrangement and spacing</p> Signup and view all the answers

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

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

    What is the unique property of water that makes it different from other substances?

    <p>Its density increases when it changes from a liquid to a solid</p> Signup and view all the answers

    What is the correct order of density from highest to lowest among the three states of matter?

    <p>Solid, liquid, gas</p> Signup and view all the answers

    Why is it necessary to measure the mass and volume of the substances in the experiment?

    <p>To calculate the density of the substances</p> Signup and view all the answers

    What is the result of the particles moving further apart when a solid changes to a liquid?

    <p>The density of the substance decreases</p> Signup and view all the answers

    What is the primary reason why solids generally have high densities?

    <p>Their particles are tightly packed together</p> Signup and view all the answers

    Which state of matter has particles that are farthest apart?

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

    What is the main difference in particle arrangement between liquids and gases?

    <p>Liquids have particles close together, while gases have particles far apart</p> Signup and view all the answers

    Why does a metal cube have a higher density than water?

    <p>The metal cube has particles in a rigid structure, occupying a small volume</p> Signup and view all the answers

    What can be inferred about the density of a substance if its particles are closely packed?

    <p>The substance has a high density</p> Signup and view all the answers

    Which of the following is an example of a substance with moderate density?

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

    Why do gases have a low density?

    <p>Gases have particles that are widely spaced</p> Signup and view all the answers

    What is the ratio of mass to volume that indicates how much mass is packed into a given volume?

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

    What is the primary reason for the difference in density between the solid and gas states of a substance?

    <p>The difference in particle spacing</p> Signup and view all the answers

    What is the effect of the crystalline structure of ice on its density?

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

    Why do particles pack tightly together in a solid?

    <p>Because of the strong intermolecular forces</p> Signup and view all the answers

    What is the purpose of calculating the density of each state in the experiment?

    <p>To understand the differences in particle arrangement and spacing</p> Signup and view all the answers

    What is the result of the particles spreading out when a liquid evaporates into a gas?

    <p>A decrease in density</p> Signup and view all the answers

    Which of the following best explains why gases generally have low densities?

    <p>Because their particles are far apart</p> Signup and view all the answers

    What is the primary reason for the difference in density between water and ice?

    <p>The difference in particle spacing</p> Signup and view all the answers

    What is the result of the particles moving closer together when a gas condenses into a liquid?

    <p>An increase in density</p> Signup and view all the answers

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

    <p>Because of the rigid structure</p> Signup and view all the answers

    Which state of matter has particles that are not tightly packed but are still close together?

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

    Why do particles in a gas occupy a large volume with a small mass?

    <p>Because they are far apart and move freely</p> Signup and view all the answers

    What is the relationship between the density of a substance and its particle arrangement?

    <p>Density is inversely proportional to particle distance</p> Signup and view all the answers

    Why do solids generally have high densities compared to liquids and gases?

    <p>Because their particles are in a rigid structure</p> Signup and view all the answers

    What can be inferred about a substance with a high density?

    <p>Its particles are closely packed</p> Signup and view all the answers

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

    <p>They are close together but can move around each other</p> Signup and view all the answers

    What is the result of increasing the distance between particles in a substance?

    <p>The density of the substance decreases</p> Signup and view all the answers

    What is the main reason for the difference in density between the solid and liquid states of a substance?

    <p>The change in particle arrangement and spacing between the two states</p> Signup and view all the answers

    During the experiment, what is the purpose of measuring the mass and volume of the solid, liquid, and gas?

    <p>To determine their densities</p> Signup and view all the answers

    Why do gases have low densities compared to liquids and solids?

    <p>Because their particles are farther apart</p> Signup and view all the answers

    What is unique about the solid form of water (ice) compared to its liquid form?

    <p>It has a lower density</p> Signup and view all the answers

    What happens to the density of a substance when it changes from a gas to a liquid?

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

    What is the main reason why the density of a substance varies between its solid, liquid, and gas states?

    <p>The arrangement of particles changes between states.</p> Signup and view all the answers

    Which of the following statements is true about the density of liquids compared to solids?

    <p>Liquids have a lower density than solids.</p> Signup and view all the answers

    What can be inferred about the arrangement of particles in a substance with a low density?

    <p>The particles are widely spaced.</p> Signup and view all the answers

    Why do solids generally have high densities?

    <p>Because their particles are closely packed.</p> Signup and view all the answers

    What is the relationship between the volume of a substance and its density?

    <p>As the volume of a substance increases, its density decreases.</p> Signup and view all the answers

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