Mr Quinn Ms Tom Aim How much energy
- Slides: 10
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 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 = 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 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 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! 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 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 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 melt 81 g of water at its melting point? Q= Heat of mass = =