In very early human history, complex sanitation systems were not needed because settlements were usually very small, like the village shown below. however, as cities became larger and population densities increased, one major advancement was the development of which to channel wastewaters away from human populations more effectively than in the past.

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

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.

What happens to the temperature of a substance when the average kinetic energy of its particles increases?