ch302 notes ch6.1

ch302 notes ch6.1 - CH302 Chapter 6 notes part 1 Chemical...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CH302 Chapter 6 notes part 1 Chemical Equilibrium Some chemical reactions go to completion. To model those that do not, we use CHEMICAL EQUILIBRIUM concepts. We can predict : - the composition of a reaction at equilibrium - the effects of disturbing that equilibrium. example: NO 2 : rust colored gas, N 2 O 4 : colorless gas Put NO 2 into vessel: 1. Initially less color as N 2 O 4 forms 2. After equilibrium is reached - not colorless! 2NO 2(g) N 2 O 4(g) (fig 6.1) Chemical Equilibrium: Definition State in which the concentrations of all reactants and products remain constant with time. Chemical equilibria are dynamic equilibria. Molecules are continually reacting , even though the overall composition of the reaction mixture does not change. Remember the ants on the seesaw? Establishing Equlibrium Consider this reaction H 2 O (g) + CO (g) H 2 (g) + CO 2(g) Place equal numbers of moles of H 2 O (g) and CO (g) in a vessel. Over time the concentrations vary as shown in Fig 6.2. .BOTH forward AND backward reactions occur! Reactions occur as molecules collide. High concentration higher rate of reaction As reactant is used up, rate slows. At equilibrium, the RATES of the FORWARD AND REVERSE REACTION are EQUAL. i.e., no change in concentration of reactants and products. Equilibrium can be established from either the forward or reverse direction.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/01/2009 for the course CH 52410 taught by Professor Sutcliffe during the Spring '09 term at University of Texas.

Page1 / 3

ch302 notes ch6.1 - CH302 Chapter 6 notes part 1 Chemical...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online