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Thermochemistry
Study of heat energy in chemical reactions
Exothermic Process
Process releasing heat energy to surroundings
Endothermic Process
Process absorbing heat energy from surroundings
System
Specific matter studied in an experiment
Surroundings
Everything outside the system in an experiment
Calorie
Unit of heat; raises 1g water by 1°C
Joule
SI unit of energy
Kilocalorie
1000 calories; common unit for food energy
Dietary Calorie
Written with a capital C; 1 kcal = 1000 cal
Law of Conservation of Energy
Energy is neither created nor destroyed in a process
Heat Flow
Measured in calories or joules
Heat Capacity
Amount of heat required to raise temperature by 1°C
Heat Exchange
Transfer of heat between system and surroundings
Heat of Reaction
Heat energy change in a chemical reaction
Heat Transfer
Movement of heat from one substance to another
Heat Release
Energy released from a system to surroundings
Heat Absorption
Energy absorbed by a system from surroundings
Heat Measurement
Quantified using calories or joules
Heat Conversion
Relationship between joules and calories
Energy Conservation
Principle of energy preservation in processes
Heat Calculation
Determining heat changes in reactions
Heat Digestion
Calculating heat from food digestion
Positive Gain
Endothermic
Negative Gain
Exothermic
Melting an ice cube
endothermic
Evaporation of water
Endothermic
Baking bread
Endothermic
Photosynthesis
Endothermic
Burning a candle
Exothermic
Making of a ice cube
Exothermic
What are the three exothermic reactions?
combustion, neutralization, freezing
What are the three endothermic reactions?
sublimation, evaporating, melting
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Flashcard (36)