Calorimetric Calculations in Phases

Calorimetry exothermic

calorimeter endothermic

system energy diagram

surrounding

enthalpy​

​Keyword

1.2.1 Define calorimetry

1.2.2 Define calorimeter 1.2.3 Describe the two types of calorimeters (Bomb calorimeter & Coffee-cup calorimeter) 1.2.4 Perform different calculations in a calorimetry experiment – For Mixing aqueous solutions 1.2.5 Perform different calculations in a calorimetry experiment – For Adding a metal to water

1.2.6 Define thermochemistry

1.2.7 Differentiate among the system, the surrounding and the universe

1.2.8 Define enthalpy (H)

1.2.9 Define enthalpy change of reaction (ΔHrxn) while writing the equation used

​Objectives

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​Enthalpy

Thermochemistry is the study of heat changes that accompany chemical reactions and phase changes.

​Thermochemistry and Enthalpy

Thermochemistry

Enthalpy (H) is the ​heat content of a system at constant pressure.

is the amount of energy released or absorbed during a chemical reaction

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The value of ΔHrxn can be determined by measuring the heat flow of the reaction at constant pressure.

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Enthalpy change of reaction (ΔH)

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Match

Match the following

• system 

• surrounding 

• the heat content of a system at constant pressure 

• Heat flows into the system from its surroundings. 

• Heat flowing out of a system into its surroundings is defined as negative 

is the specific part of the universe that contains the reaction or process to study 

is everything in the universe other than the system. 

Enthalpy (H) 

Endothermic Process 

Exothermic Process 

• is the specific part of the universe that contains the reaction or process to study 

• is everything in the universe other than the system. 

• Enthalpy (H) 

• Endothermic Process 

• Exothermic Process 

Open Ended

Consider the following diagram to answer questions a – f 

a) Which diagram represents an exothermic process? 

b) Which diagram represents an endothermic process? 

c) Is heat flow positive or negative in diagram (a)? 

d) Is heat flow positive or negative in diagram (b)? 

e) What does a negative value for heat represent? 

f) What does a positive value for heat represent?