Read This! (seriously…read this carefully) Reversible reactions never come to an end: they just reach equilibrium. That is, they reach a point when there is no further change in concentrations of reactants or products. The forward and reverse reactions (dynamic), but so that the overall continue to occur at the same rate amounts of reactants and products remain constant (equilibrium). Model 2 Chemical Equilibrium – The data table below shows the moles of A and B in a 1 liter container over a period of time in a system that initially contains only reactant A. A(g) B(g) ⇄ Time Concentration Concentration (min) of A (M) of B (M) 0 10.00 0 1 6.00 4.00 2 3.20 6.80 3 2.64 7.36 4 2.53 7.47 5 2.51 7.49 6 2.50 7.50 7 2.50 7.50 8 2.50 7.50 9 2.50 7.50 10 2.50 7.50 At what time in Model 2 does the system reach equilibrium? Based on the data in Model 2, does the reaction reach equilibrium when the moles of A are equal to the moles of B? After equilibrium was reached, what is true about the amount of moles of reactant A and moles of product B? What is when a reaction reaches equilibrium? “equal”
Read This! (seriously…read this carefully) Reversible reactions never come to an end: they just reach equilibrium. That is, they reach a point when there is no further change in concentrations of reactants or products. The forward and reverse reactions continue to occur (dynamic), but at the same rate so that the overall amounts of reactants and products remain constant (equilibrium). Model 2 – Chemical Equilibrium The data table below shows the moles of A and B in a 1 liter container over a period of time in a system that initially contains only reactant A. A(g) ⇄ B(g) Time (min) Concentration of A (M) Concentration of B (M) 0 10.00 0 1 6.00 4.00 2 3.20 6.80 3 2.64 7.36 4 2.53 7.47 5 2.51 7.49 6 2.50 7.50 7 2.50 7.50 8 2.50 7.50 9 2.50 7.50 10 2.50 7.50 At what time in Model 2 does the system reach equilibrium? Based on the data in Model 2, does the reaction reach equilibrium when the moles of A are equal to the moles of B? After equilibrium was reached, what is true about the amount of moles of reactant A and moles of product B? What is “equal” when a reaction reaches equilibrium?