Consider the reaction: 2hbr(g)-> h2(g)+br2(g)

a) express the rate of the reaction in terms of the change in concentration of each of the reactants and products.

b)in the first 25.0s of this reaction, the concentration of hbr dropped from 0.600m to 0.512m. calculate the average rate of the reaction.

c)if the volume of the reactino vessel in part b was 1.50l, what amount of br2(in moles) was formed during the first 15.0s of the reaciton?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

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.

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions