Rates of Reaction & Collision Theory

Watch particles collide - only some collisions have enough energy and the right orientation to react

Conditions

Temperature25°C
Concentration of A50
Concentration of B40

Simulation

Time elapsed0.0 s
● A0
● B0
● Product0
Collision freq.0 /s
Reaction rate0 /s
Low activation energyHigh activation energy

Product formed vs. time

A steeper line means a faster rate of reaction. Compare the slope before and after you change a variable.

Distribution of particle energies

Red marks the activation energy, Ea - the minimum energy a collision needs to react. Only particles in the shaded tail (to the right of the line) can react on collision. Raising temperature spreads the curve out and pushes more of it past Ea; a catalyst instead moves the line itself, to the left.
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