Mr Quinn Ms Tom Aim How much energy

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Mr. Quinn & Ms. Tom Aim: How much energy is required to melt of

Mr. Quinn & Ms. Tom 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? March 5, 2014

Two Types of Reactions • Phase changes require energy called LATENT HEAT. • To

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

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 = mass = Hints: What are you looking for? Where do you find “Heat of Fusion? ” Q = Heat of Fusion x mass

Let’s Try It Out! What is the amount of heat energy Q = Heat

Let’s Try It Out! What is the amount of heat energy Q = Heat of Vaporization x mass required to completely vaporize 15 g of water at its boiling point? Q= Heat of Vaporization= 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

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 mass = = Hints: What are you looking for? Which heat are you looking for? Q = Heat of x mass

Your Turn!

Your Turn!

Your Turn! What is the amount of heat energy required to completely melt 6

Your Turn! What is the amount of heat energy required to completely melt 6 g of water at 0 °C? Q= Heat of Fusion = mass = Hints: What are you looking for? Where do you find “Heat of Fusion? ” Q = Heat of Fusion x mass

Your Turn! What is the amount of heat energy Q = Heat of Vaporization

Your Turn! What is the amount of heat energy Q = Heat of Vaporization x mass required to completely vaporize 36 g of water at its boiling point? Q= Heat of Vaporization= 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

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 mass = = Hints: What are you looking for? Where do you find “Heat of Vaporization? ” Q = Heat of x mass

Let’s Try It Out! What is the amount of heat energy required to completely

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 = =