Heating Curve Poster Work Time You have 30 minutes to finish your poster with your partner. Make sure that you answer all of the questions on the bottom.

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Presentation transcript:

Heating Curve Poster Work Time You have 30 minutes to finish your poster with your partner. Make sure that you answer all of the questions on the bottom of the sheet. Finalize your poster by adding color and pen. Check that you have all the required elements with the rubric on the back.

Think-Pair-Share Think: How could you calculate how much energy was released from the Cheeto? What information do you think would be important to know? Pair: discuss your thoughts with your partner. Share: share your ideas with the class. End

Lecture 7.4: Calorimetry I

Learning Targets LT7.5 – Using calorimetry data, I can utilize my knowledge of temperature change, latent heats, and specific heats to calculate the amount of heat transferred for a reaction.

How do we calculate heat energy?

I. Specific Heat Capacity A.Specific heat capacity = amount of energy required to raise 1 g of a substance 1 ˚C. B.Symbol: c C.Units: J/g˚C D.Every substance and every phase of every substance has a different specific heat capacity.

II. Calculating q A.Heat energy = (mass)(specific heat)(temp change) q = mcΔT q – heat energy m – mass of object c – specific heat capacity ΔT = final temp – initial temp

Example (I Do): If m = 10.0g, c = 1.0 J/g˚C, final temp = 25 ˚C and initial temp = 10 ˚C, what is q? VariablesEquationsWork

Example (I Do): What is the energy change in Joules that occurs when 40.0 g of Fe is heated from 25 ˚C to 37 ˚C? Iron has a specific heat of 0.46 J/g˚C VariablesEquationsWork

Example (We Do): If 4000 J of energy is absorbed when 225 g of Fe is heated from 87 ˚C, what is the final temperature of the iron? (c = 0.46 J/g˚C) VariablesEquationsWork

Whiteboard Question #1 If m = 10.0 g, c = 2.0 J/g˚C, and ΔT = 20 ˚C, what is q?

Whiteboard Question #2 How much energy is absorbed by 20g of gold if it is heated from 0 ˚C to its melting point at 1064 ˚C? The specific heat of gold is 25.6 J/g ˚C.

Whiteboard Question #3 You need 71 Joules of energy to raise the temperature of 34.0 g of NH 3 from 23.0 ˚C to 24.0 ˚C. Calculate the specific heat capacity (c) of ammonia.

Whiteboard Question #4 7,150 Joules of heat is added to 150g of water at a temperature of 31.0 ˚C. What is the final temperature of the water? (c = 4.2 J/g˚C)

Independent Practice Begin working independently on the Calorimetry practice. 10 points on this exercise and your exit ticket are your ticket out the door today.

Closing Time Homework: – HW7.2 due date extended to Weds. – Additional tutoring today/tomorrow after school and lunch. Unit 7 Test Thursday/Friday.