Record snowfalls were recorded in the rocky mountains in 1997 following warmer- than- average water temperatures in the easthern pacific ocean. what likely caused the extra snow? a. an occluded front b. la nina c. el nino d. the jet stream

Chemistry worksheet - i am not sure what they are asking for exactly?

Answer asap need to be answered 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.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false