Catalyst 1 Define endothermic Give an example 2

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Catalyst 1. Define endothermic. Give an example. 2. Define exothermic. Give an example 3.

Catalyst 1. Define endothermic. Give an example. 2. Define exothermic. Give an example 3. I cool a glass of water, is this an endothermic process or an exothermic process? End

Learning Log Assessment Rate yourself 1 – 4 on LTs 7. 1 and 7.

Learning Log Assessment Rate yourself 1 – 4 on LTs 7. 1 and 7. 2

LECTURE 7. 2 – CALORIMETRY

LECTURE 7. 2 – CALORIMETRY

Today’s Learning Target • LT 7. 6 – Using calorimetry data, I can utilize

Today’s Learning Target • LT 7. 6 – Using calorimetry data, I can utilize my knowledge of temperature change and specific heats to calculate the amount of heat transferred for a reaction.

Today’s Focus Question • How do we determine the amount of calories in Flamin’

Today’s Focus Question • How do we determine the amount of calories in Flamin’ Hot Cheetos?

How is the energy of food measured?

How is the energy of food measured?

I. Specific Heat • The amount of energy that is transferred is dependent on

I. Specific Heat • The amount of energy that is transferred is dependent on the nature of the material receiving the energy. • Specific Heat (Cp) – The energy required to raise the temperature of one gram of substance one degree Celsius

II. Calorimetry • Calorimetry is the science of measuring the heat of a chemical

II. Calorimetry • Calorimetry is the science of measuring the heat of a chemical reaction. • q represents the heat gained/released • Cp is the specific heat • ΔT = Final Temperature – Initial Temp.

Class Example • A 4. 0 g sample of glass is heated from 274

Class Example • A 4. 0 g sample of glass is heated from 274 K to 314 K. Glass has a specific heat of 0. 20 J/(g x K). How much heat is gained during this heating?

Table Talk • The specific heat of copper is 0. 4 J/o. C. How

Table Talk • The specific heat of copper is 0. 4 J/o. C. How much heat is needed to change the temperature of a 30 g sample of copper from 20. 0 o. C to 60. 0 o. C?

Stop and Jot • Determine the specific heat of a material if a 35

Stop and Jot • Determine the specific heat of a material if a 35 g sample absorbed 96 J as it was heated from 293 K to 313 K.

SUMMARIZE

SUMMARIZE

Food Facts! How much sugar do you take in every day? Every week? Every

Food Facts! How much sugar do you take in every day? Every week? Every year?

Calories in Flamin’ Cheetos • Q can be measured in calories • Food scientists

Calories in Flamin’ Cheetos • Q can be measured in calories • Food scientists measure the calories contained within food by measuring the amount of energy it takes to raise 1 g of water 1 o. C. • 1000 calories = 1 Calorie • 1 serving of Cheetos has 140 Calories

Flamin Hot Cheetos Lab

Flamin Hot Cheetos Lab

Flamin’ Hot Cheetos Lab • Read the lab carefully and answer the pre-lab questions.

Flamin’ Hot Cheetos Lab • Read the lab carefully and answer the pre-lab questions. • This will serve as preparation for Mon/Tues lab on Flamin’ Hot Cheetos. • Grade yourself on the pre-lab assessment using the answer key available online. • Place the sticker for your corresponding score on the data wall.

Exit Slip 1. I have a sample of water and I increase the temperature

Exit Slip 1. I have a sample of water and I increase the temperature from 10. 0 o. C to 40 o. C. The specific heat of water is 4. 18 J/(g x o. C). Calculate the heat absorbed for this process.

Learning Log Assessment Rate yourself 1 – 4 on LT 7. 6

Learning Log Assessment Rate yourself 1 – 4 on LT 7. 6

Closing Time • Homework 7. 2 – Calorimetry Calculations

Closing Time • Homework 7. 2 – Calorimetry Calculations

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