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Mr. Quinn & Ms. Tom March 5, 2014
Aim: How much energy is required to melt of boil water?
Do Now: Look at the heating curve to the right. Does melting or boiling require more energy? How can you tell?
Two Types of Reactions
• Phase changes require energy called LATENT HEAT.
• To melt we use the “heat of fusion,” and to boil we use the “heat of vaporization.”
• For melting: Q = Heat of Fusion x mass• • For boiling: Q = Heat of Vaporization x mass
Let’s Try It Out!
What is the amount of heat energy required to completely melt 10 g of water at 0 °C?
Q = Heat of Fusion x mass
Q =Heat of Fusion = mass =
Hints:What are you looking for?Where do you find “Heat of Fusion?”
Let’s Try It Out!
What is the amount of heat energy required to completely vaporize 15 g of water at its boiling point?
Q = Heat of Vaporization x mass
Q =Heat ofVaporization= mass =
Hints:What are you looking for?Where do you find “Heat of Vaporization?”
Let’s Try It Out!
What is the amount of heat energy required to completely vaporize 23 g of water at 100 °C?
Q = Heat of x mass
Q =Heat of = mass =
Hints:What are you looking for?Which heat are you looking for?
Your Turn!
Your Turn!
What is the amount of heat energy required to completely melt 6 g of water at 0 °C?
Q = Heat of Fusion x mass
Q =Heat of Fusion = mass =
Hints:What are you looking for?Where do you find “Heat of Fusion?”
Your Turn!
What is the amount of heat energy required to completely vaporize 36 g of water at its boiling point?
Q = Heat of Vaporization x mass
Q =Heat ofVaporization= mass =
Hints:What are you looking for?Where do you find “Heat of Vaporization?”
Let’s Try It Out!
What is the amount of heat energy required to completely boil 17 g of water at 100 °C?
Q = Heat of x mass
Q =Heat of = mass =
Hints:What are you looking for?Where do you find “Heat of Vaporization?”
Let’s Try It Out!
What is the amount of heat energy required to completely melt 81 g of water at its melting point?
Q =Heat of = mass =
