Note card for final exam

# Note card for final exam - CH 15: rate of rxn(relative...

This preview shows page 1. Sign up to view the full content.

CH 15: rate of rxn(relative rate) = ∆[]/∆t EX: 2N 2 O 5 4NO 2 + O 2 ... –½ ∆[ N 2 O 5 ]/∆t = ¼∆ [NO 2 ]/∆t = ∆[ O 2 ]/∆t \ rate constant = K[A] m [B] n EX: 2NO + Cl 2 2NOCl…K[NO] 2 [Cl 2 ] \ Instantaneous rate : determined by drawing tangent line to the [] – time curve at particular time…obtain rate from slope of line \ catalysts : substances that accelerate chemical reactions, but are not themselves transformed \ order of rxn : obtained experimentally \ rate constant k : proportionality constant that relates rate and concentration at a given temp \ 1 st order rxns : units of k are time -1 2 nd order rxns : units of k are L/mol * time… 3 rd order rxns : units of k are mol/L * time \ integrated rate eq. : ln * [R] t /[R] 0 = -kt (for 1 st order)…[R] 0 = rxn time t=0 and [R] t = later time t \ integrated rate eq.: 1/[R] t – 1/[R] o = kt (for 2 nd order) \ integ. rate eq.: [R] 0 – [R] t = kt (for zero order) \ half life (t 1/2 ) : t 1/2 = 0.693/k \ homogenous catalyst : catalyst present in same phase (gas, solid, liquid) as the reactants
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 06/08/2008 for the course CH 223 taught by Professor Carney during the Spring '08 term at Linn Benton Community College.

Ask a homework question - tutors are online