1. INVESTIGATION: ENERGY CONVERSIONS & THERMAL ENERGY Peanut Calorimetry October 31 & November 1, 2012

2. TODAY  OPENER: I want you to think about a campfire… Now describe as many energy conversions that are happening in that campfire as you can… Challenge yourself- what about a marshmallow that catches on fire?

3. OBJECTIVES AND ASSESSMENT  SW create a visual representation for the lab investigation  SW gather and organize data collected from peanut lab  Lab Analysis due 1 week from today Tuesday November 5, 2013

4. TERMS TO KNOW  Thermal Energy = heat energy; most common unit is Joules  Q=mc T  T=change in temperature in Celsius  c= specific heat- constant value that is unique to every substance can be found in reference material or textbook  m= mass in grams  Q = thermal energy  Law of Conservation of Energy

5. SAMPLE THERMAL ENERGY PROBLEM A flaming marshmallow is placed directly under a can 100 mL of water. “All” of the energy being released by the marshmallow is used to change the temperature of water from 20°C to 25°C. Water has a specific heat of 4.18 J/g °C, how much thermal energy was released from the marshmallow?

6. TO SOLVE  Write down the formula  Q=mc T  List the variables Q= c= m= T =  Pull out the number values from the problem Q= c= m= T =  Do the math

7. BEFORE WE START  Hypothesis  If a peanut is caught on fire  Then the energy will be released from the chemical bonds as thermal energy and can be measured using the thermal energy equation  Because of Law of Conservation of energy- Energy can not be created or destroyed only transferred or transformed

8. MAKING A STORYBOARD In your notebooks, on the page after last class session’s notes 1. Divide the paper into 9 “equal” boxes. 2. Read over the directions as a group 3. Decide what it is that you are supposed to do 4. Draw a diagram to illustrate each step in the procedure. You may use words to help supplement your diagrams. 5. All group members must complete this and get checked off by Ms. Wilson before continuing. 6. DO the lab! Record the data collected on the handout sheet.

9. SO…  Which type of peanut had the most energy and how do you know??  Would this procedure work for a potato chip? Explain  Why would this type of procedure not work with ice cream?? Explain.

10. FUN WITH FORMULAS– THERMAL ENERGY BASIC - An iron skillet has a mass of 500.0 g. The specific heat of iron is 0.449 J/g C. How much heat must be absorbed to raise the skillet’s temperature by 95.0 C? PROFICIENT: What mass of water (specific heat = 4.18 J/gC) will change its temperature by 3.0 C when 525J of heat is added? ADVANCED- A peanut burned in a calorimeter transfers 18,200 J to 100.0 g of water. What is the water’s original temperature if the final temperature was 82C?