Heat Transfer in Substances Quiz
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Questions and Answers

What formula should be used to calculate the amount of energy needed to heat 346 grams of liquid water from 0°C to 182°C, given that the problem indicates no change in temperature and involves a liquid phase?

  • q = m ΔHfus
  • q = m ΔHvap (correct)
  • q = m ΔT
  • q = m c ΔT

    • What is the amount of energy (in kJ) needed to heat 346 grams of liquid water from 0°C to 182°C, given that the specific heat of water is 4.184 J/g°C and the Δhvap of water is 40.79 kJ/mol?

  • 1,470.65 kJ
  • 11,777.24 kJ
  • 5,888.62 kJ (correct)
  • 2,941.30 kJ

    • How can the effect of a heating curve be achieved using CO2 or dry ice?

  • By heating the dry ice to its critical point and then its triple point.
  • By cooling the dry ice to its sublimation point and then its deposition point.
  • By heating the dry ice to its melting point and then its boiling point.
  • Because carbon dioxide cannot exist as a liquid at atmospheric pressure, the dry ice sublimates and instantly produces a gas, condensing water vapor, and creating a thick white fog. (correct)

    • What are the three main areas shown in a phase diagram?

    <p>Solid, Liquid, Gas</p> Signup and view all the answers

    What are the three main curves shown in a phase diagram?

    <p>Melting/Freezing, Vaporization/Condensation, Sublimation/Deposition</p> Signup and view all the answers

    What are the two important points shown in a phase diagram?

    <p>Critical point and triple point</p> Signup and view all the answers

    Which of the following statements is true about the effect of heating a substance?

    <p>The added heat is used to break attractive forces between particles, with no increase in temperature.</p> Signup and view all the answers

    What is the purpose of a heating curve?

    <p>To show the relationship between temperature and time during heating.</p> Signup and view all the answers

    If the temperature of a substance decreases, which of the following is true?

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

    What does the specific heat of a substance represent?

    <p>The amount of heat needed to raise the temperature of 1 gram of the substance by 1°C.</p> Signup and view all the answers

    When a substance undergoes a phase change during heating, what is observed?

    <p>No change in temperature.</p> Signup and view all the answers

    Which of the following calculations can be performed using the specific heat of a substance?

    <p>Finding the amount of heat required to raise or lower the temperature of a given mass by a certain amount.</p> Signup and view all the answers

    What is the critical point on a phase diagram?

    <p>The point where the liquid and gaseous phases merge into a single phase</p> Signup and view all the answers

    What happens to the melting point of water at higher pressures?

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

    What is true about the triple point of a substance?

    <p>It represents equilibrium between all three phases of matter</p> Signup and view all the answers

    Which term describes a phase that exhibits properties of both gas and liquid?

    <p>Supercritical fluid</p> Signup and view all the answers

    What is the significance of the critical temperature and pressure for a substance?

    <p>They define when a supercritical fluid forms</p> Signup and view all the answers

    Which phase change occurs when a substance goes from a solid directly to a gas?

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

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