Which of the following statements about how ECPs and RU-486 work is most correct?
A) Both ECPs and RU-486 prevent pregnancy.
B) ECPs prevent pregnancy, while RU-486 ends pregnancy at an early stage.
C) ECPs end pregnancy at an early stage, while RU-486 prevents pregnancy.
D) Both ECPs and RU-486 end pregnancy at an early stage.
Question 2
The rate constant for a particular second-order reaction is 0.47 M-1s-1. If the initial concentration of reactant is 0.25 mol/L, it takes ________ s for the concentration to decrease to 0.20 mol/L.
A) 2.1
B) 1.4
C) 1.0
D) 0.47
E) 0.20
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