Describe the effect on the hi concentration if the following changes are made in the reaction:

a) a small amount of h2 is added
b) the temperature on the system is increased

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.

the answer is symmetrical : )