4.1 INTRO TO THERMOCHEMISTRY Mrs. Wilson. Objectives ■Know and understand the definitions and concepts of types of energy, the law of conservation of.

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4.1 INTRO TO THERMOCHEMISTRY Mrs. Wilson

Objectives ■Know and understand the definitions and concepts of types of energy, the law of conservation of mass, heat transfer, endothermic and exothermic processes, the units of energy, heat capacity, and specific heat capacity. ■Solve calorimetry problems to determine heat absorbed or released, temperature change, initial temperature, final temperature, mass, or specific heat capacity, using the formula q = mC ΔT. Please get ALL the papers on the side, and a calculator. Homework: Lesson 4.1a homework – Daily Quiz next class. All Unit 4 Hwk answers available on website homepage.

Engage/Explore: The Burning Cheeto ■Objective: Review the concepts of energy, heat transfer, the law of conservation of energy, endothermic vs. exothermic processes, heat capacity and specific heat capacity. Learn how to calculate amount of energy transferred from a burning Cheeto to water. Solve heat content and calorimetry problems. ■Procedure Setup: Move your bags away from the lab tables. Place < 50 mL of water in the empty soda can, Mount one Cheeto on the foil and paper clip. Set the Cheeto on fire. **Record volume of the water, initial temperature, and final temperature after the Cheeto has finished burning. ■CLEAN UP IMMEDIATELY. Answer the questions on the supplemental notes. Cheeto on paper clip + foil

Engage/Explore: The Burning Cheeto ■What did you put? Check your answers with someone at your table and make sure you all agree. ■You are responsible for knowing all the definitions for the concepts in lesson 4.1a. Answering the questions should help you understand them.

Pg. 4 of packet; consult chart of specific heat capacities Answer for question #1: 1.51 x 10 5 J or 151 kJ (1000 J = 1 kJ)

Answer: 8.56 x 10 3 J or 8.56 kJ NOTE that the specific heat capacities of any metal are very low! Thus it takes far less energy to heat up 1 g of silver than it does to heat up 1 g of water. Don’t touch a cast iron pan while it’s being heated!

Supplemental Problems (I’ll do the lefthand ones, you’ll do the righthand ones) (11.1 ℃ )

You try! (0.711 J/(g· ℃ ))

(4.63 x 10 3 cal)

You try! (17.5 ℃ )

(0.432 J/(g· ℃ ))

You try! (92.77 ℃ )

Exit Ticket: On the index card – show all of your work. ■A piece of unknown solid with a mass of 5.19 g is heated to o C and dropped into 10.0 mL of water at o C. The final temperature of the system is o C. ■What is the specific heat capacity of the solid? ■Identify the solid using the chart of specific heat capacities in your packet, pg. 4.