This preview shows pages 1–8. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Systems Open Closed Isolated Typical thermodynamic system: a cylinder with a gas. Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Perpetuum mobilus Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Force, F something that makes objects accelerate, i.e. change speed. SI unit: newton. F = m a 1 N = 1 kg 1 m/s 2 Work, W the measure of the result of the force action. SI unit: joule. W = F d 1 J = 1 N 1 m Heat, Q the energy passed through molecular motion. Unit: joule. Some basic definitions Pressure, P a force per unit of surface. SI unit: pascal. P = F/S 1 Pa = 1 N/m 2 Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Energy Kinetic (energy of motion) Potential (energy of position under influence of some force) mv 2 E=  2 Gravitational E= mgh Electrostatic q 1 q 2 E= k d Energy forms can be converted one into another Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Units of energy Unit of energy in SI units is joule . 1 J is energy needed to move an object along 1 m with a constantly applied force 1 N. (1N gives 1 kg body acceleration 1m/s 2 ). 1 J = 1 N * 1 m Widely used calorie is nonSI unit. One calorie is a heat needed to warm 1 g of water by 1 C (at 14.5 C) 1 cal = 4.184 J Both macroscopic energy and heat can be measured in J or cal. Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Heat flow Spontaneously heat flows from hotter systems to colder ones. Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Internal energy of a system System looses internal energy to surroundings, E < 0 System gains energy from surroundings, E > 0 Internal energy of system, E a sum of all kinetic and potential energies of all components of the system....
View
Full
Document
This note was uploaded on 01/02/2012 for the course CHEM 114 taught by Professor Sergeiaksyonov during the Fall '11 term at ASU.
 Fall '11
 SergeiAksyonov
 Chemistry, Thermochemistry

Click to edit the document details