Heat of Fusion and Heat of Vaporization

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

Tags

NGSS.MS-PS1-4

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

Tags

NGSS.MS-PS1-4

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

• Part I

• Part II

• Part III

• Part IV

Tags

NGSS.MS-PS1-4

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

Tags

NGSS.MS-PS1-4

The amount of heat needed to change 1 gram of a substance from the liquid phase to the gas phase is ___

• Heat of Vaporization

• Boiling point

• Heat Energy

• Phase change

Tags

NGSS.MS-PS1-4

What is the vaporization point of the substance?

• 280 K

• 340 K

• 175 K

• 310 K

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

Tags

NGSS.MS-PS1-4

Which line segment represents the heat of vaporization (ΔH_vap)?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is the heat of vaporization (Lv)?

• The heat required to change 1 kg of a substance from a liquid to a gas

• The heat required to change 1 kg of a substance from a gas to a liquid

• The heat required to change 1 g of a substance from a liquid to a gas

• The heat required to change 1 g of a substance from a gas to a liquid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4