Temperature and Heat Basics
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Questions and Answers

What is the formula for converting Celsius temperature to Kelvin?

  • TK = TC - 273.15
  • TK = 1.8TC + 32
  • TK = HC + 273.15
  • TK = TC + 273.15 (correct)

    • If the change in temperature in Kelvin is ΔTK = 10, what is the corresponding change in temperature in Celsius?

  • ΔTC = 10 + 273.15
  • ΔTC = 273.15 + 10
  • ΔTC = 10 (correct)
  • ΔTC = 0

    • How is the relationship between Fahrenheit (TF) and Kelvin (TK) expressed?

  • TK = (5/9)(TF - 32) + 273.15 (correct)
  • TK = (5/9)(TF + 32) + 273.15
  • TK = (TF - 32)/1.8 + 273.15
  • TK = (9/5)(TF - 32) + 273.15

    • Given TC1 = 0 °C and TC2 = 100 °C, what is the change in temperature ΔTC?

    <p>100 °C</p> Signup and view all the answers

    If TK2 = 300 K and TK1 = 273.15 K, what is the change in temperature in Kelvin, ΔTK?

    <p>27.85 K</p> Signup and view all the answers

    What is the formula to convert Fahrenheit to Kelvin?

    <p>TK = (TF - 32) * 5/9 + 273.15</p> Signup and view all the answers

    What is the change in temperature in Celsius when a block is heated from 30°C to 90°C?

    <p>60°C</p> Signup and view all the answers

    If 60°C corresponds to what change in temperature in Fahrenheit?

    <p>108°F</p> Signup and view all the answers

    At what point do the Celsius and Fahrenheit scales intersect?

    <p>-40°C and -40°F</p> Signup and view all the answers

    How would you find the temperature in Kelvin if the temperature in Fahrenheit is 272°F?

    <p>TK = (272 - 32) * 5/9 + 273.15</p> Signup and view all the answers

    What temperature is the point where the Celsius and Fahrenheit scales coincide?

    <p>-40 °C</p> Signup and view all the answers

    The formula for calculating heat energy gained or lost by a substance is given by which of the following equations?

    <p>$Q = m ∙ S ∙ ΔT$</p> Signup and view all the answers

    If a substance with a specific heat of 2 cal/g°C and a mass of 50 g is heated, what factor influences the final temperature directly?

    <p>Amount of heat energy (Q)</p> Signup and view all the answers

    What is the equivalent of 1 Kcal in Joules?

    <p>4180 J</p> Signup and view all the answers

    If the initial temperature of a substance is 25 °C and it loses 15 °C, what will be its final temperature?

    <p>10 °C</p> Signup and view all the answers

    Which of the following statements about heat transfer is incorrect?

    <p>Heat flows spontaneously from cold to hot.</p> Signup and view all the answers

    What does ΔT represent in the formula for heat energy?

    <p>The change in temperature</p> Signup and view all the answers

    If an object cools from 100 °C to 40 °C, what is the temperature change (ΔT) experienced by the object?

    <p>60 °C</p> Signup and view all the answers

    What is the value of TC when TF is 78 0F?

    <p>25.56 0C</p> Signup and view all the answers

    What is the change in temperature in Kelvin if TK1 is 293.15 K and TK2 is 300 K?

    <p>3.85 K</p> Signup and view all the answers

    If TC is -65 0C, what is its equivalent in Kelvin?

    <p>208.15 K</p> Signup and view all the answers

    What is the formula to convert TF to TC?

    <p>$TC = \frac{(TF - 32)}{9}$</p> Signup and view all the answers

    How do you calculate the change in temperature in Fahrenheit given the change in Celsius?

    <p>$\Delta TF = \Delta TC \times \frac{9}{5}$</p> Signup and view all the answers

    What is the value of TK when TC is 20 0C?

    <p>293.15 K</p> Signup and view all the answers

    What is the conversion of TF = 300 0F to TC?

    <p>148.89 0C</p> Signup and view all the answers

    Given TF = 82 0F, what will be its equivalent in Kelvin?

    <p>295.37 K</p> Signup and view all the answers

    What is the specific heat of water in Joules per kilogram per degree Celsius?

    <p>4180 J/Kg.0C</p> Signup and view all the answers

    Which formula is used to calculate the heat required when a substance maintains the same phase?

    <p>Q = mSw(Tf - Ti)</p> Signup and view all the answers

    If 4 Kg of water is heated from 20°C to 100°C, how much heat is required?

    <p>1.34 x 10^6 J</p> Signup and view all the answers

    What is the definition of a calorie?

    <p>Heat to raise 1 g of water by 1°C</p> Signup and view all the answers

    What is the freezing point of water in the Kelvin scale?

    <p>273.15 K</p> Signup and view all the answers

    If 6.7 KJ of heat is applied to 100 g of glass at an initial temperature of 20°C, what is the final temperature?

    <p>120°C</p> Signup and view all the answers

    Which equation correctly relates temperature in Celsius to temperature in Fahrenheit?

    <p>TC = 5/9(TF - 32)</p> Signup and view all the answers

    Which of the following statements is true regarding specific heat?

    <p>Specific heat can vary depending on the phase of a substance.</p> Signup and view all the answers

    What must be constant in order to use the calorimetry equation Q = mSΔT?

    <p>The phase of the substance must remain unchanged.</p> Signup and view all the answers

    If the temperature in Celsius is 100°C, what is the corresponding temperature in Fahrenheit?

    <p>212°F</p> Signup and view all the answers

    What is the purpose of specific heat in thermodynamics?

    <p>To quantify the heat transfer of a substance.</p> Signup and view all the answers

    What is the boiling point of water in Celsius?

    <p>100°C</p> Signup and view all the answers

    What is the correct way to calculate the change in temperature in Celsius from Fahrenheit?

    <p>ΔTC = (ΔTF) × 5/9</p> Signup and view all the answers

    How is the temperature in Kelvin related to temperature in Celsius?

    <p>TK = TC + 273.15</p> Signup and view all the answers

    Which temperature scale has its conversion formula including a subtraction of 32?

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

    What is the corresponding temperature in Celsius when it is 32°F?

    <p>0°C</p> Signup and view all the answers

    What is the correct relationship for the change in temperature from Celsius to Fahrenheit?

    <p>ΔTC = ΔTF/9 x 5</p> Signup and view all the answers

    Which of the following statements about temperature measurement is incorrect?

    <p>Kelvin scale's freezing point of water is 0 K.</p> Signup and view all the answers

    Study Notes

    Temperature and Heat

    • Temperature (T) is a measure of hotness or coldness of bodies.
    • Temperature is measured using scales.
      • Celsius (°C)
      • Fahrenheit (°F)
      • Kelvin (K)
    • Freezing point of water: 0°C = 32°F = 273.15 K
    • Boiling point of water: 100°C = 212°F = 373.15 K

    Relation Between Temperature Scales

    • To convert between Celsius (°C) and Fahrenheit (°F):
      • Tc = (5/9)(Tf - 32)
      • Tf = (9/5)Tc + 32
    • To convert between Celsius (°C) and Kelvin (K):
      • Tc = Tk - 273.15
      • Tk = Tc + 273.15

    Heat Energy

    • Heat (Q) is a form of energy that can transfer from a hot substance to a colder substance.
    • Heat energy is measured in:
      • Calories (cal)
      • Kilocalories (kcal)
      • Joules (J)
      • 1 cal = 4.18 J
      • 1 kcal = 10³ cal = 4180 J

    Heating and Cooling an Object

    • Heating: Heat energy (Q) added to an object of mass (m) with initial temperature (Ti) raises its temperature to a final temperature (Tf) (Tf > Ti).

    • Cooling: Heat energy (Q) lost from an object of mass (m) with initial temperature (Ti) lowers its temperature to a final temperature (Tf) (Tf < Ti).

    Specific Heat

    • Specific heat (S) measures how much heat energy is required to raise the temperature of a unit mass of a substance by 1°C.
      • S = Q / (m * ΔT)
      • m = mass
      • ΔT = change in temperature
    • Specific heat of water is 4180 J/(kg•°C)

    Important Note

    • Q = m * S * ΔT is used only if the substance maintains the same phase (solid, liquid, or gas).

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    Lecture 1 - Heat PDF

    Description

    This quiz covers the fundamental concepts of temperature and heat energy, including temperature scales such as Celsius, Fahrenheit, and Kelvin. It explores the conversion formulas between these scales and the measurement of heat energy in various units. Test your understanding of these essential topics in thermodynamics.

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