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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
Enthalpy (IGNORE)

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?