LECTURE 8.4 – CALORIMETRY.

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Presentation transcript:

LECTURE 8.4 – CALORIMETRY

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.

How is the energy of food measured?

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 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 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/oC. How much heat is needed to change the temperature of a 30 g sample of copper from 20.0 oC to 60.0 oC?

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.