. Sildenafil is a drug that is removed from the body in a process that follows first order kinetics with k = 0.20 hr-1 . How long does it take for the level of Sildenafil in the blood to fall to 10% of the original concentration?

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

What type of reaction fuels the processes seen here?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car