[cvc121]

In a heterogeneous reaction, does an increase in surface area between two phases increase or decrease reaction rate. I think it will increase the rate of the reaction because more surface area is available for the reaction.

Can anyone confirm? Thanks!

[Zyklonb]

This is correct. There's several ways to speed up a reaction, the most common are: heating it, (increasing the number and energy of the collisions), increasing surface area (allowing more collisions) and adding a catalyst (increasing the number of successful collisions).