Gr 8 Natural Sciences Ch 2.2: Pressure
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Questions and Answers

What is the force that gas particles exert when they collide with the walls of their container?

  • Friction
  • Gas pressure (correct)
  • Tension
  • Electromagnetic force

    • What is the function of a pressure gauge?

  • To measure the pressure of a gas (correct)
  • To change the volume of a container
  • To measure the temperature of a gas
  • To control the release of air

    • What happens to the pressure of a gas when it is heated?

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

    • What is the effect of decreasing the volume of a gas on its pressure?

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

    What is the result of fewer gas particles in a container?

    <p>Lower pressure</p> Signup and view all the answers

    What is the primary reason for the increase in gas pressure when the temperature is increased?

    <p>Increase in the speed of the particles</p> Signup and view all the answers

    What is the term for the mechanism that controls the release or admission of air into a container?

    <p>Air valve</p> Signup and view all the answers

    What is the primary cause of gas pressure?

    <p>The motion of the gas particles</p> Signup and view all the answers

    What is the primary function of a pressure gauge?

    <p>To measure the pressure inside a container</p> Signup and view all the answers

    What happens to the particles of a gas when it is heated?

    <p>They move faster and collide more with the container walls</p> Signup and view all the answers

    What is the effect of decreasing the volume of a gas on its pressure?

    <p>The pressure increases</p> Signup and view all the answers

    What happens to the pressure of a gas when it is moved from a smaller container to a larger one?

    <p>The pressure decreases</p> Signup and view all the answers

    What is the purpose of blowing air into a balloon in the activity to measure gas pressure?

    <p>To increase the pressure inside the balloon</p> Signup and view all the answers

    What is the difference between a simple pressure gauge and a digital pressure gauge?

    <p>A digital pressure gauge is more accurate</p> Signup and view all the answers

    What is the primary factor that determines the frequency of collisions between gas particles and the container walls?

    <p>Number of particles</p> Signup and view all the answers

    Why does cooling a gas decrease its pressure?

    <p>The particles lose energy and move slower</p> Signup and view all the answers

    What happens to the pressure of a gas when its volume is increased?

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

    What is the result of increasing the number of gas particles in a container?

    <p>The pressure increases</p> Signup and view all the answers

    Why do gas particles collide with each other and the container walls?

    <p>Because they are in constant motion</p> Signup and view all the answers

    What is the effect of heating a gas on the frequency of collisions?

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

    What is the primary reason for the decrease in gas pressure when the volume is increased?

    <p>Less frequent collisions</p> Signup and view all the answers

    What is the relationship between the number of gas particles and the frequency of collisions?

    <p>They are directly proportional</p> Signup and view all the answers

    What is the main reason for the movement of the bar or needle in a pressure gauge?

    <p>The collisions of air particles with the disc</p> Signup and view all the answers

    What happens to the density of a gas when it is moved from a smaller container to a larger one?

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

    What is the effect of cooling a gas on its pressure?

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

    What is the purpose of measuring the pressure inside a balloon?

    <p>To observe how the pressure changes as more air is added</p> Signup and view all the answers

    What happens to the pressure of a gas when its volume is increased?

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

    What is the main reason for the difference in readings between a simple pressure gauge and a digital pressure gauge?

    <p>The method of measurement</p> Signup and view all the answers

    What is the primary factor that influences the force of collisions between gas particles and the container walls?

    <p>The speed of the gas particles</p> Signup and view all the answers

    What happens to the pressure of a gas when its particles move faster?

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

    Which of the following is NOT a factor that affects gas pressure?

    <p>Color of the container</p> Signup and view all the answers

    What is the result of increasing the volume of a gas while keeping the number of particles constant?

    <p>The pressure decreases</p> Signup and view all the answers

    What is the relationship between the number of gas particles and the frequency of collisions?

    <p>Directly proportional</p> Signup and view all the answers

    What happens to the pressure of a gas when it is cooled?

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

    Why does increasing the number of gas particles in a container result in higher pressure?

    <p>Because the particles collide more frequently</p> Signup and view all the answers

    What is the primary reason for the decrease in gas pressure when the volume is increased?

    <p>Because the particles collide less frequently</p> Signup and view all the answers

    What happens to the pressure inside a balloon when more air is added?

    <p>The pressure increases</p> Signup and view all the answers

    What is the effect of increasing the volume of a gas on its pressure?

    <p>The pressure decreases</p> Signup and view all the answers

    Why does the pressure of a gas decrease when it is moved from a smaller container to a larger one?

    <p>The particles have more space to move</p> Signup and view all the answers

    What is the primary reason for the movement of the bar or needle in a pressure gauge?

    <p>The force from gas particles colliding with the container walls</p> Signup and view all the answers

    What happens to the density of a gas when it is heated?

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

    What is the primary reason for the decrease in gas pressure when a gas is cooled?

    <p>The particles move slower</p> Signup and view all the answers

    Which of the following best explains why the pressure of a gas increases when its volume is decreased?

    <p>The particles have less space to move, resulting in more frequent collisions with the container walls.</p> Signup and view all the answers

    What is the primary reason for the decrease in pressure when a gas is moved from a smaller container to a larger one?

    <p>The particles have more space to move, resulting in fewer collisions with the container walls.</p> Signup and view all the answers

    Which of the following is a direct result of increasing the temperature of a gas?

    <p>An increase in the frequency of collisions between particles and the container walls.</p> Signup and view all the answers

    What is the primary reason for the difference in pressure readings between a simple pressure gauge and a digital pressure gauge?

    <p>The method of measurement used by the gauge.</p> Signup and view all the answers

    Which of the following best explains why the pressure of a gas decreases when it is cooled?

    <p>The particles move slower and collide less frequently with the container walls.</p> Signup and view all the answers

    What is the primary reason for the increase in pressure when a gas is compressed into a smaller container?

    <p>The particles move faster and collide more frequently with the container walls.</p> Signup and view all the answers

    What is the primary reason why gas particles collide with each other and the container walls?

    <p>The particles have kinetic energy</p> Signup and view all the answers

    Which of the following best explains why increasing the temperature of a gas increases its pressure?

    <p>The particles move faster and collide more frequently</p> Signup and view all the answers

    What is the effect of increasing the volume of a gas while keeping the number of particles constant?

    <p>The pressure decreases</p> Signup and view all the answers

    What is the primary reason why gas pressure is higher in a smaller container than in a larger one?

    <p>The particles are more densely packed</p> Signup and view all the answers

    What happens to the number of collisions between gas particles and the container walls when the number of particles is increased?

    <p>The number of collisions increases</p> Signup and view all the answers

    What is the relationship between the temperature of a gas and the frequency of collisions between the particles and the container walls?

    <p>The frequency of collisions increases with increasing temperature</p> Signup and view all the answers

    What is the effect of reducing the number of gas particles in a container on the frequency of collisions?

    <p>The frequency of collisions decreases</p> Signup and view all the answers

    What is the primary factor that determines the force of collisions between gas particles and the container walls?

    <p>The kinetic energy of the particles</p> Signup and view all the answers

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