Order of reactions?

[mhuang 1E]

Could someone clarify what exactly is zero, first and second order reactions?

[Mia Navarro 1D]

Zero is when the rate does not depend on the reactant concentration.
First is when the rate is proportionate to the reactant concentration.
Second is when the rate is proportionate to the square of the reactant concentration.

[Tiffany Dao 1A]

It's easy to determine what n (the order) equals if you add up all the powers of the concentrations. Add the products' powers together and subtract the reactants' powers .

[Harrison Wang 1H]

Zero - rate of reaction is equal to rate constant k
1st order - depends on only ONE reactant concentration
2nd order - depends on two different reactants or one reactant squared