Heat Unit Review

How many Joules of energy are required to make 100 grams of ice at 0 ^οC completely melt?

• 200 J

• 400 J

• 33,400 J

• 2,000,000 J

During a phase change, temperature....

• increases

• is unchanged

• decreases

• Increases or decreases

The heat of fusion of water is

• 334 J/g

• 334 J

• 2260 J/g

• 2260 J

The heat of vaporization of water is

• 334 J

• 334 J/g

• 2260 J

• 2260 J/g

A process that absorbs heat is an _______ process

• Endothermic
• Exothermic 
• Polythermic 
• Ectothermic 

A process that releases heat is an _____ process

• endothermic
• exothermic
• polythermic
• ectothermic

What letter represents boiling?

• B
• C
• D
• E

Heat is measured in 

• joules
• grams
• degrees celcius
• mililiters

How much heat is required to melt 26.0 g of ice at 0^∘C?

• 5.88 x 10⁷ J

• 8,680 J

• 109 J

• 0 J

How much heat is required to vaporize 150. g of water at 100^∘C?

• 62,700 J

• 50,100 J

• 150,000 J

• 339,000 J