Tube worms that survive near geothermal vents of hydrogen sulfide rely on bacteria living inside them to obtain energy by the oxidation of H 2S to SO 4 2-. What is the overall change in the oxidation number of sulfur for this reaction?

The overall change in the oxidation number of sulfur is 8.

Explanation:

Oxidation number is defined number assigned to an element in reaction which represent the loss or gain of electrons by an atom of an element in a compound.

In

let the oxidation number of S in hydrogen sulfide be x.

x = -2

In

let the oxidation number of S in sulfate ion be x.

x = -2 + 8 = +6

The overall change in the oxidation number of sulfur :

= [+6] - [-2] = 8

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

try answer.com that works for me