What are the half-reactions for a galvanic cell with Zn and Ni electrodes? A. Zn(s) → Zn2+(aq) + 2e and Ni2+(aq) + 2e → Ni(s)

B. Zn2+(aq) + 2e → Zn(s) and Ni(s) > Ni2+(aq) + 2e

C. Zn2+(aq) + 2e → Zn(s) and Ni2+(aq) + 2e → Ni(s)

D. Zn(s) → Zn2+(aq) + 2e and Ni(s) → Ni2+(aq) + 2e

(The answer is A. Btw)

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

the answer is c. nacl

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock