Specific Heat Capacity and Phase Changes

What is specific heat capacity?

• The amount of heat required to raise the temperature of one gram of a substance by 1°C

• The amount of radiant energy required to increase the temperature of one gram of a substance by 1°C

• The amount of energy required to increase the temperature of one gram of a substance by 1°C

• The amount of friction required to increase the temperature of one gram of a substance by 1°C

The specific heat of platinum is 0.133 J/g°C. How much heat is released when a 10.0 g piece of platinum cools from 100.0°C to 50.0°C?

• -66.5 J

• -665 J

• -0.0266 J

• -0.665 J

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Calculate the amount of energy required to melt 35 grams of ice. ΔH_f = 80.0 cal/g, ΔH_v = 560.0 cal/g, c = 1.00 cal/gºC

• 19,000 cal

• 35 cal

• 2,800 cal

• 1,600,000 cal

How much heat moves from the water to the surroundings when 20.0 g of water is heated from 20.0°C to 25.0°C? The specific heat of water is 4.184 J/g°C.

• 418 J

• 209 J

• 83.0 J

• 4.18 J

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Energy, per amount, absorbed or released when a substance melts or freezes is called

• Heat of vaporization

• Heat of deposition

• Heat of fusion

• Heat of sublimation

The specific heat of copper is 0.39 J/g °C. What is the temperature change when 100. Joules of heat is added to 20.0 grams?

• 1.85°C

• 24.1°C

• 12.8°C

• 5130°C

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The specific heat of water is 4.184 J/g°C, and the specific heat of wood is 1.760 J/g°C. Which material needs more heat to raise the temperature?

• Water

• Wood

• Both are same

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A substance with a low specific heat heats up __________, while a substance with a high specific heat heats up __________.

• Slowly, quickly

• Quickly, slowly

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The temperature of an unknown piece of metal with a mass of 30.0 g changes from 25.0°C to 35.0°C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?

• 1.17 J/g°C

• -1.17 J/g°C

• 0.857 J/g°C

• -0.857 J/g°C

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What is the formula used to calculate the heat required to raise the temperature of any substance?

• Q=mc

• Q=mc∆t

• Q= ½mv

• m=QC