By Carolyn Stevens and Alyce Casey

The collision theory is the process where the reacting particles collide, with enough energy to break the bonds and reconstruct them to form a new product.

Activated Complex – the partial bonding that occurs in the brief moment between bond disruption and bond formation

Activation Energy – the minimum amount of energy required in order for an effective collision to occur

Energy of Reaction (ΔH)

Activation Energy

Nature of the Reactantsweak bond → increases collision efficiency → faster reaction

Surface Area (only affects solids)

crushing → increases surface area → increases collision frequency → faster reaction

Concentration (only affects liquids and gases)

increased pressure (gases only) → increases concentration → more particles → increases collision frequency → faster reaction

Temperature (endothermic and exothermic)

increased temperature → higher Ek → faster particles → increases collision frequency → faster reaction

Catalyst (creates an alternate path for the reaction without being changed)

catalyst → lower energy barrier → increases collision frequency → faster reaction

t[product]

t[reactant]

RreactΔ

Δ

Δ

Δ

In the decomposition reaction2 N2O5(g) → 4 NO2(g) + O2(g)

that takes place in 1.5L of pure carbon tetrachloride solution, 0.04 moles of O2 are produced over 5.7 minutes.

Calculate (a) the rate of production of O2 gas and (b) the loss of N2O5 (g).

2Omin / L / moles0047.0min 5.7*L 1.5

moles 0.04

Δ

Δ

t[reactant]

Rreact

Answer to part (a):

Answer to part (b):

(0.047 mol/L/min)(2) = 0.0094 mol/L/min N2O5

"Chemical bonds." JCCC Staff and Faculty Pages. Web. 15 Dec. 2009. <http://staff.jccc.net/PDECELL/chemistry/bonds.html>.

"Factors Affecting Reaction Rates." Centre for Distance Learning and Innovation. Web. 11 Dec. 2009. <http://www.cdli.ca/sampleResources/chem3202/unit01_org 01_ilo03/b_activity.html>.

"Lesson Index Chapter 10." Web. 11 Dec. 2009. <http://www.fordhamprep.org/gcurran/sho/sho/lessons/lessi ndex10.htm>.

"Measurements." Welcome to Mr Wolfe's Science. Web. 11 Dec. 2009. <http://wolfesscience.com/measurements.htm>.

"Optimize." ~ listen the world ~. Web. 16 Dec. 2009. <http://listentheworld.wordpress.com/category/optimize/>.

Therrien, Eric. Chemistry 12. Print.