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Ch.6 - Thermochemistry WorksheetSee all chapters

# First Law of Thermodynamics

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Sections
Nature of Energy
Kinetic & Potential Energy
First Law of Thermodynamics
Internal Energy
Endothermic & Exothermic Reactions
Heat Capacity
Constant-Pressure Calorimetry
Constant-Volume Calorimetry
Thermal Equilibrium
Thermochemical Equations
Formation Equations
Enthalpy of Formation
Hess's Law

The First Law of Thermodynamics states that energy cannot be created nor destroyed, but instead is transferred.

###### Understanding the First Law of Thermodynamics

Concept #1: First Law of Thermodynamics

Example #1: A chemist wishing to determine the final temperature of 30.0 g of a metal ore places it into an insulated beaker containing 615.5 g of water at 42.18 ºC. It is determined that the metal gains 19.11 kJ of energy. From the information provided, determine the system and the surroundings.

Concept #2: Heat and Work

Heat is the flow of thermal energy while work is the movement of reacting molecules.

Concept #3: Heat and Work Chart

Practice: What are the signs of q and w when a system loses heat while doing work on the surroundings?