Heat of Fusion

How many Joules of energy are required to make 100 grams of ice at 0 °C completely melt? The specific latent heat of fusion of ice is 334 J/g

• 200 J

• 400 J

• 33,400 J

• 2,000,000 J

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The heat absorbed by melting a solid is known as

• latent heat of fusion

• latent heat of solid

• latent heat of liquid

• latent heat of vaporisation

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Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of fusion?

• Part I

• Part II

• Part III

• Part IV

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This formula is used to find the amount of heat (energy) neccesary when there's a phase change

• Q= (h)(ΔT)

• Q=(m)(L)

• Q=(m)(c)(ΔT)

• Q=(k)(A)(dT)

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Which line segment represents the heat of fusion (ΔHfus)?

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NGSS.MS-PS3-4

Which line segment represents the heat of fusion (ΔHfus)?

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The heat of fusion for sodium chloride (NaCl) is 30.2 kj/mole and the melting point is 801 degrees Celsius. How much heat is needed to melt 625 grams of NaCl?

• The heat needed to melt 625 grams of NaCl is 326 kJ.

• The heat needed to melt 625 grams of NaCl is 100.8 kJ.

• The heat needed to melt 625 grams of NaCl is 600.2 kJ.

• The heat needed to melt 625 grams of NaCl is 250.5 kJ.

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The heat of fusion for sodium chloride (NaCl) is 30.2 kj/mole and the melting point is 801 degrees Celsius. How much heat is needed to melt 5.2 moles of NaCl?

• 120.5 kj

• 157.04 kj

• 75.3 kj

• 200.1 kj

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How much energy is required to change 5 kg of ice at 0 °C into water at the same temperature? (latent heat of fusion is 3.36 X10^6J/kg )

• 16.1 XundefinedJ

• 16.8 XundefinedJ

• 15.1 Xundefinedcal

• 16.8 Xundefinedcal

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Calculate the amount of heat added to 15 kg gold to change phase from solid to liquid. (The heat of fusion for gold is 64500 J/kg)

• 967,500 calories

• 976, 500 Joules

• 967,500 Joules

• 976, 500 calories

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