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Chemistry (CP)

Module 1 · Text Lab Safety
Module 2 · Text The Scientific Method
Module 3 · Media Law Vs. Theory
Module 4 · Media Accuracy Vs. Precision
Module 5 · Text Sig-Figs and Scientific Notation
Module 6 · Text Matter
Module 7 · Text Displacement
Module 8 · Text Density
Module 9 · Text SI Units
Module 10 · Media Dimensional Analysis
Module 11 · Media The Periodic Table
Module 12 · Text Isotopes
Module 13 · Text Nuclear Reactions
Module 14 · Text Nuclear Fission and Fusion
Module 15 · Text Chemical Vs. Nuclear Reaction
Module 16 · Text Electron Shells
Module 17 · Text Ions
Module 18 · Text Solubility and Conductivity
Module 19 · Media Types of Bonding
Module 20 · Text Chemical Formulas
Module 21 · Text Functional Groups
Module 22 · Text Electron Domains
Module 23 · Text Polarity
Module 24 · Text Chemical Equations
Module 25 · Text Physical Vs. Chemical Change
Module 26 · Text Types of Reactions
Module 27 · Text Moles
Module 28 · Text Solubility and Molarity
Module 29 · Media Miracle Moles
Module 30 · Text Acids and Bases
Module 31 · Media pH and pOH
Module 32 · Text Dilutions
Module 33 · Text Neutralization Reactions and Titrations
Module 34 · Text Mol Ratios
Module 35 · Media Stoichiometry
Module 36 · Text Endothermic and Exothermic Energy Transfer You are here
Module 37 · Text Specific Heat
Module 38 · Media Heating and Cooling Curves and Phase Change
Module 39 · Text Gas Laws and Kinetic Molecular Frequency.

Close the course

Module 36 of 39 · Text

Endothermic and Exothermic Energy Transfer

Enyx Jiang

Exothermic and Endothermic Energy Transfer

The chemical process you are focusing on is referred to as the system. The surroundings are anything outside of the system.

A chemical process involves energy transfer due to temperature differences between two substances.

Endothermic (cold)
- transfer of heat to the system from the surroundings
Exothermic (hot)
- transfer of heat from the system to the surroundings

Thermodynamics

Thermodynamics is the study of energy and its transformations

1st Law of Thermodynamics
- Energy is conserved- it doesn't just disappear, it is transferred
2nd Law of Thermodynamics
- Energy tends to disperse
- Entropy tends to increase
Thermal Equilibrium- when the objects in contact are the same temperature
- You can not transfer energy from a cold object to a hot object because this would concentrate the energy