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Physics > Heat > Flashcards

Heat Flashcards

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1
Q
  • Define heat.
A
  • Heat is the energy that flows from one body to another due to a temperature difference between them.
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2
Q
  • What is the SI unit of heat?
A
  • Joule (J)
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3
Q
  • Define heat capacity.
A
  • Heat capacity is the quantity of heat required to raise the temperature of a given body by 1K.
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4
Q
  • What is the formula for heat capacity?
A
  • Q = C∆T
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5
Q
  • Define specific heat capacity.
A
  • Specific heat capacity is the amount of heat required to raise the temperature of a substance of mass 1kg by 1K.
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6
Q
  • What is the formula for specific heat capacity?
A
  • Q = mc∆T
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7
Q
  • Describe an experiment to determine specific heat capacity by the method of mixtures.
A
  • [Describe the experiment, including steps, equipment, and calculations]
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8
Q
  • What is latent heat?
A
  • Latent heat is the energy required by a substance to change its state at constant temperature.
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9
Q
  • Define specific latent heat of vaporization.
A
  • Specific latent heat of vaporization is the quantity of heat required to change a unit mass of a substance from liquid to vapor at constant temperature.
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10
Q
  • What is the formula for specific latent heat of vaporization?
A
  • Q = mlv
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11
Q
  • Define specific latent heat of fusion.
A
  • Specific latent heat of fusion is the quantity of heat required to change a unit mass of a substance from solid to liquid at constant temperature.
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12
Q
  • What is the formula for specific latent heat of fusion?
A
  • Q = mlf
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13
Q
  • Explain the factors affecting the rate of evaporation.
A
  • [List and explain factors such as temperature, surface area, humidity, wind, etc.]
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14
Q
  • Describe the effect of pressure on melting.
A
  • [Explain how pressure affects the melting point of a substance, such as in the case of ice skating]
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15
Q
  • What is the relationship between boiling point and pressure?
A
  • Boiling point increases with increasing pressure and decreases with decreasing pressure.
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16
Q
  • How does a pressure cooker work?
A
  • A pressure cooker is a sealed container that traps steam, raising the pressure inside. This increased pressure raises the boiling point of water, allowing food to cook faster at a higher temperature.
17
Q
  • What is the difference between unsaturated vapor and saturated vapor?
A
  • Unsaturated vapor exists when there are fewer vapor molecules in the air than the maximum amount the air can hold at that temperature. Saturated vapor exists when the air is filled with the maximum amount of vapor it can hold at a specific temperature.
18
Q
  • How does temperature affect the rate of evaporation?
A
  • The rate of evaporation increases with increasing temperature. Higher temperatures provide molecules with more kinetic energy, allowing them to escape the liquid phase more easily.
19
Q
  • How does evaporation cause cooling?
A
  • During evaporation, faster-moving molecules at the liquid’s surface escape, leaving behind slower-moving molecules. This reduces the average kinetic energy of the remaining molecules, lowering the liquid’s temperature.
20
Q
  • Give some examples of cooling by evaporation.
A
  • Sweat evaporating from skin, alcohol evaporating from a wet cloth, water evaporating from an earthen pot.
21
Q
  • What are some factors that affect the rate of evaporation?
A
  • Temperature, exposed surface area, air current, nature of the liquid (boiling point), and pressure.
22
Q
  • What are some applications of evaporation?
A
  • Cooling refrigerators, sweating to regulate body temperature, drying clothes.
23
Q
  • What is the formula for specific latent heat of vaporization?
A
  • Q = mlv
24
Q
  • Define specific latent heat of fusion.
A
  • Specific latent heat of fusion is the quantity of heat required to change a unit mass of a substance from solid to liquid at constant temperature.
25
Q
  • What is the formula for specific latent heat of fusion?
A
  • Q = mlf
26
Q
  • Explain the factors affecting the rate of evaporation.
A
  • [List and explain factors such as temperature, surface area, humidity, wind, etc.]
27
Q
  • Describe the effect of pressure on melting.
A
  • [Explain how pressure affects the melting point of a substance, such as in the case of ice skating]

Physics (7 decks)

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