CHEM 1A03 Study Guide - Final Guide: Heat Capacity, Coffee Cup, Molar Mass

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: David J.H.Emslie

Document Summary

Different materials of the same temperature feel like different temperatures, but are the same. They feel different because they have different heat capacities: each substance has unique ability to store heat, we define amount of heat required to change temperature of a system by one degree with units of j. Degrees celsius: can think of heat capacity as its ability to resist temperature change when energy is added to, or removed from, the system. Temperature change comes from translation of molecules when energy is added. Molecules can resist translation because of strong intermolecular forces like hydrogen bonding (why water has high heat capacity. Energy could also be stored as potential energy by molecules. Results from thermal energy being expressed through a molecules internal motions. More complex molecule and more internal degrees of freedom, higher specific heat capacity. Can calculate energy associated with heat flow using the equation: