8.89. Earth's Crust The following chemical reactions have helped to shape Earth's crust. Determine the oxidation numbers of
all the elements in the reactants and products, and identify
which elements are oxidized and which are reduced:
2. 3 SiO2(3) + 2 Fe:0,(3) →3 Fe SiO.(s) + O2(g)
t. SiO2(3) + 2 Fe(s) + O2(g) → Fe SiO (5)
c4 FeO(s) + O2(5) + 6 HOO4 Fe(OH)3(s)

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.

Fred is studying a substance that is made out of only one element. this means that