Given the balanced equation representing a redox reaction:
2al + 3cu2+ --> 2al3+ + 3cu
which statement is true about this reaction?
(1) each al loses 2e- and each cu2+ gains 3e-
(2) each al loses 3e- and each cu2+ gains 2e-
(3) each al3+ gains 2e- and each cu loses 3e-
(4) each al3+ gains 3e- and each cu loses 2e-

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

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.

Who determined the nature of chemical bonds?