Consider the redox reaction below. Zn(s) + 2HCl(aq)
→ ZnCl2(aq) + H2(g)
Which half reaction correctly describes the oxidation that is taking place?
Zn4*(s) + 2e (aq) — Zn(s)
2+
Zn(s) —>Zn2+ (aq) + 2e-
O 2H+ + 2e - →H2
H2+2e → 2H+

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.

Which of the following is not true about the atomic model of substances?

Write a balanced equation showing the formation of copper (ii) nitrite from its elements