1. balance the following redox equations by the ion-electron method: (25 points) a. h2o2 + fe+2 → fe+3 + h2o (in acidic solution) b. cu + hno3 → cu+2 + no + h2o (in acidic solution) c. cn– + mno4– → cno– + mno2 (in basic solution) d. br2 → bro3– + br– (in basic solution) e. s2o3–2 + i2 → i– + s4o62– (in acidic solution)

cno

Explanation:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

a:

by the combination of an unlimited number of elements