Behavior of gases
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Questions and Answers

What equation relates the mass of a gas to the number of moles?

  • n = m*M
  • M = n*m
  • n = m/M (correct)
  • m = n/M
  • Which of the following correctly expresses the relationship between different units of volume?

  • 1 m³ = 10⁶dm³
  • 1 m³ = 10³cm³
  • 1 m³ = 10³dm³ (correct)
  • 1 m³ = 10⁶L
  • What device is used to measure atmospheric pressure?

  • Thermometer
  • Barometer (correct)
  • Hydrometer
  • Manometer
  • What is the SI unit of pressure?

    <p>Pascal (Pa)</p> Signup and view all the answers

    When the atmospheric pressure increases, what happens to the height of the mercury column in a barometer?

    <p>The height of the column increases</p> Signup and view all the answers

    Which of the following accurately describes gas pressure?

    <p>The force exerted per unit area</p> Signup and view all the answers

    What occurs to the volume of a gas when it is allowed to expand in a larger container?

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

    What is the numerical equivalent of 1 atmosphere pressure in kilopascals?

    <p>101.325 kPa</p> Signup and view all the answers

    What happens to the volume of a gas when the pressure increases, according to Boyle's Law?

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

    In a scenario where the temperature is constant, if the volume of a gas is doubled, what is the expected change in pressure?

    <p>Pressure is halved.</p> Signup and view all the answers

    What do the PV values represent in the context of Boyle's law experiments?

    <p>The product of pressure and volume.</p> Signup and view all the answers

    What is indicated by the isotherm derived from the pressure-volume curve?

    <p>PV remains constant despite pressure changes.</p> Signup and view all the answers

    If the initial conditions of a gas are 1 atm and 3.15 L, what will be the resulting volume if the pressure changes to 3.5 atm at the same temperature?

    <p>0.90 L</p> Signup and view all the answers

    Which of the following situations illustrates the practical importance of Boyle's Law?

    <p>The flight of an aircraft at high altitude.</p> Signup and view all the answers

    What is the relationship between density and pressure changes with altitude, as described in the content?

    <p>Density decreases with altitude.</p> Signup and view all the answers

    What happens to the molecules of gas when the gas is compressed, according to Boyle's Law?

    <p>They occupy less space.</p> Signup and view all the answers

    What is the additional pressure required to decrease the volume of a gas from 2.5 L to 1.5 L at constant temperature?

    <p>6 x 10⁵ Nm⁻²</p> Signup and view all the answers

    According to Boyle's law, if a gas occupies 10 L at 190 mm pressure, what will be its volume at 1 atm pressure, assuming constant temperature?

    <p>2.5 L</p> Signup and view all the answers

    What will the volume of a given mass of gas be at -2°C if it was V₀ at 0°C?

    <p>V₀ (1 - 2/273)</p> Signup and view all the answers

    What does Charles's Law state about the volume of gas in relation to temperature?

    <p>The volume increases at a rate of 1/273 for each degree increase in temperature.</p> Signup and view all the answers

    What is the lowest possible temperature known as, at which all gases are supposed to occupy zero volume?

    <p>Absolute zero</p> Signup and view all the answers

    If a gas initially occupies a volume of 100 L at 1 atm and is reduced to 5 L at the same temperature, how much additional pressure must be applied?

    <p>19 atm</p> Signup and view all the answers

    In a gas system described by Boyle's law, what relationship holds true when temperature is constant?

    <p>Pressure and volume are inversely proportional.</p> Signup and view all the answers

    What is the formula to express the volume of a gas at a temperature t°C based on its volume at 0°C?

    <p>V₁ = V₀ (1 + t/273)</p> Signup and view all the answers

    How many moles of sulphur dioxide are present in 1 x 10²² molecules?

    <p>1.66 x 10⁻² moles</p> Signup and view all the answers

    What is the temperature in Kelvin when it is 27°C?

    <p>300 K</p> Signup and view all the answers

    Calculate the pressure of 1.66 x 10⁻² moles of gas in a 2.5 L vessel at 300 K using the ideal gas law.

    <p>1.635 x 10¹ atm</p> Signup and view all the answers

    According to Dalton's Law of Partial Pressures, what does the total pressure of a gas mixture equal?

    <p>The sum of the partial pressures of each gas</p> Signup and view all the answers

    What does the term 'aqueous tension' refer to in relation to gas pressure?

    <p>Pressure exerted by the water vapors</p> Signup and view all the answers

    If the observed pressure of moist gas is 5 atm and the aqueous tension at that temperature is 1 atm, what is the pressure of the dry gas?

    <p>4 atm</p> Signup and view all the answers

    If the pressure of nitrogen in a 1 L container is P₁ and that of oxygen in another 1 L container is P₂, what is the pressure in a mixture of both gases in a 1 L container?

    <p>P₁ + P₂</p> Signup and view all the answers

    What volume will a gas occupy at 100°C and 5.0 atm if its volume at N.T.P is 10.00 L?

    <p>2.73 L</p> Signup and view all the answers

    What does the ratio $ rac{PV}{T}$ represent for a given quantity of gas?

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

    According to Avogadro's law, which of the following statements is true?

    <p>The volume of a gas at constant temperature and pressure is proportional to the number of moles.</p> Signup and view all the answers

    What is the relationship of K in the ideal gas equation PV = nRT?

    <p>K is directly proportional to the number of moles of gas.</p> Signup and view all the answers

    Which of the following expressions is a correct application of Boyle's law?

    <p>V ∝ $ rac{1}{P}$ (at constant T and n)</p> Signup and view all the answers

    What is the numerical value of the universal gas constant R when pressure is in atmosphere and volume in liters?

    <p>0.0821 litre atm K⁻¹ mol⁻¹</p> Signup and view all the answers

    Which conditions are necessary to state the volume of a given mass of gas?

    <p>Both temperature and pressure must be specified.</p> Signup and view all the answers

    What conclusion can be drawn from the equation PV = nRT?

    <p>The product of pressure and volume is directly proportional to the number of moles.</p> Signup and view all the answers

    What is the effect of temperature on the volume of gas at constant pressure, according to Charles' law?

    <p>Volume increases as temperature increases.</p> Signup and view all the answers

    What is the primary function of a manometer?

    <p>To measure gas pressure</p> Signup and view all the answers

    According to Boyle's law, what happens to the volume of a gas when its pressure increases, assuming constant temperature?

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

    If the level of mercury in the longer limb of a manometer is higher, how is the gas pressure related to atmospheric pressure?

    <p>Gas pressure is greater than atmospheric pressure.</p> Signup and view all the answers

    What defines the zero point on the Celsius temperature scale?

    <p>It is an arbitrary reference point.</p> Signup and view all the answers

    What happens to gas pressure if the level of mercury in the shorter limb of a manometer is higher than in the longer limb?

    <p>Gas pressure is less than atmospheric pressure.</p> Signup and view all the answers

    According to Boyle's law, what remains constant when examining the pressure-volume relationship of a gas?

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

    What is the mathematical representation of Boyle's law?

    <p>$PV = K$</p> Signup and view all the answers

    Why are temperatures below -273.15°C considered unattainable?

    <p>Because they contradict the laws of thermodynamics.</p> Signup and view all the answers

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