Dynamic equilibria, chemical cells and fuel cells GapFill

A system in dynamic equilibrium, such as the reversible reaction to form ammonia from hydrogen and nitrogen in the  Le ChatelierMendeleevHaberElectrolysisDaltonAvogadro process, will act to minimise a change in conditions.

• If the concentration of a reactant or product is changed, the  concentrationmassstatepressuretemperatureenergy level of all the substances will change until the reaction is at equilibrium again.
• If the temperature of the system is changed, the rate of the forward and backward reactions will change until equilibrium is reached. 
• For reactions with gaseous reactants, the pressure can affect the position of equilibrium. 
• Catalysts do not change the position of equilibrium, but will speed up the rate at which it is reached.

An chemical cell produces a voltage until the chemicals are  cooleddemagnetisedused upgasesneutralisedsolidified. 

Fuel cells use a fuel such as hydrogen. They also take in  methaneoxygencarbon dioxidecarbon monoxidenitrogenneon from the air. In these cells, hydrogen is  oxidisedreducedpolymerisedcooledliquefiedgenerated to form  an alkalia carbohydratean alkanemethanewateran acid as the only product. This reaction produces  a magnetic polegreenhouse gasesa potential differencean increase in entropya change in pressureactivation energy. The half-equations for an electrochemical cell are:

• Cathode: H₂ (g) →  2OH⁻OH⁻4OH⁻H⁺4H⁺2H⁺ (aq) + 2e⁻
• Anode: 4H⁺ (aq) + O₂ (g) +  2e⁻3e⁻6e⁻4e⁻2OH⁻ (aq)4OH⁻ (aq) → 2H₂O (l)