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DO NOW: (back of Notes) • On a cold winter’s day you open the door to your house. Are you letting the cold in, or the heat out? • How is the amount of calories measured in food? • Is the chemistry calorie the same as the food calorie?

Day 1 -N otes Unit: Thermochemistry Heat, Temperature, Energy Conversions

After today you will be able to… • Explain what thermochemistry is • List different types of energy • Explain what happens to particle motion when heat energy is added • Convert between units of calories (cal), Joules (J) , and kilo-Joules (k. J)

Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state. Energy: The ability to do work or supply heat.

Different Forms of Energy • Kinetic • Potential • Heat • Solar • Nuclear • Wind • Sound • Magnetic

Heat: (q) a form of energy • Flows from warmer objects to cooler objects • If two objects come into contact with one another, heat will move from the warmer object to the cooler object until they are the same temperature. -At this point, equilibrium is reached.

When you add heat energy, molecules move faster; temperature increases. • Temperature: a measure of heat, increase temperature Chemical Potential Energy: stored energy in chemical bonds • Depends on the type of atoms and arrangement

In a chemical reaction, either: • PE is converted to heat (heat is given off – feels hot, exothermic) • Heat is absorbed and converted to PE (feels cool, endothermic)

Law of Conservation of Energy: Energy can neither be created nor destroyed, only converted from one form to another. Units of Energy: • Joule (J) • calorie (cal): chemistry calorie! • Calorie (Cal): food calorie - 1 food Cal = 1000 chemistry cal - 1 cal = 4. 184 J

Conversions between energy units: Example: How many calories are in 287 J? K: 287 J U: ? cal 287 J x 1 cal = 68. 6 cal 4. 184 J 1

Conversions between energy units: Example: How many k. J are equal to 1478 cal? K: 1478 cal U: ? k. J 1478 cal x 4. 184 J x 1 k. J = 1000 J 1 cal 1 6. 184 k. J

Questions? Complete WS due at end of class!

SILENCE IS GOLD-EN

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