As deepwater drilling for crude oil continues deeper into the earth, why is drilling mud used in place of seawater? select one: a. drilling mud is the result of the drilling process and is not used during the drilling. b. drilling mud is more dense and will settle deeper down the tunnel. c. drilling mud is easier to access than sea water at those depths. d. drilling mud provides additional pressure to keep the tunnel form collapsing.

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

The excretory system, need answers for all: )

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.