18. If the cell is initially at standard-state conditions, which of the following statements is true? Zn2+(aq) + 2e- ↔Zn(s); E° = -0.76 V

Cu2+(aq) + 2e- ↔Cu(s); E° = 0.34 V

A. Initially Kc = 2 x 10-37, and it decreases with time.

B. Initially Kc = 2 x 1037, and it does not change with time.

C. Initially Kc = 2 x 1037, and it decreases with time.

D. Initially Kc = 2 x 1037, and it increases with time.

E. Initially Kc = 2 x 10-37, and it increases with time.

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.

Salt in oceans comes from and of rocks

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point