The rate constant for this first‑order reaction is 0.900 s − 1 at 400 ∘ C. A ⟶ products How long, in seconds, would it take for the concentration of A to decrease from 0.600 M to 0.300 M?

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost