When B and C is significantly larger than A

[Julianne Seog 3K]

In the course reader, it says if the concentration of B and C is significantly larger than A then the reaction rate depends only on A. How much is "significantly larger" so that this rule can apply?

[Johnson Thai 1L]

I believe it is just "significantly large" enough so that the concentrations of B and C remain constant when A is being used up. This way, as stated in the Course Reader, the reaction rate depends on just concentration of A.

[Cherry_Deng_1K]

Also, I am pretty sure a question will tell you that the concentrations of B and C are significantly larger than A. You will probably not know to write a pseudo-first-order rate law (or other order depending on the reaction) otherwise.

[ChristinaRoble3J]

I also don't understand this in my opinion "significantly large" is very subjective, so I am also confused as to how we know if one or two of the reactants are in "large excess" in comparison to another. I hope lavelle goes over this.