Which of the following conditions would speed a reaction up by allowing more of the collisions between gaseous reactants to occur with the correct orientation and/or sufficient collision energy? There may be none, one, or more than one correct answer; check all that apply. add an inert gas (e.g. He) to the system increase the concentration of a reactant decrease the volume of the container decrease the temperature of the system Which conditions are representative of a system in chemical equilibrium? There may be none, one, or more than one correct answer. Check all that apply. The concentration is not changing The concentration is changing The system is static The system is dynamic The system is open The system is closed The forward and reverse reactions have stopped The forward and reverse reactions are occurring at the same rate Which set of conditions are representative of a system that can reach chemical equilibrium? The system is open and dynamic The system is closed and static The system is open and static The system is closed and dynamic What is a closed system? A system in which matter is free to enter and exit but energy is not. A system in which energy is free to enter and exit, but matter is not. A system in which neither energy nor matter can enter or exit. A system in which energy and matter are both free to enter and exit. Using the following graph, determine the value of Kc for the formation of nitrogen dioxide. N2(g) +2 O2(g) 2 NO2(g) 28 26 <--[N2] 24 [02] 22 20 18 16 14 12 -[NO2] Concentration (mol/L) 6 4 2 0 10 1 2 4 6 7 Time (s) Answer to 3 significant digits. The following system was set up and allowed to come to equilibrium: C2H2(g) + 2 H2(g) C2H6(g) At equilibrium the concentration of ethane was 3.00 mol/L, the concentration of hydrogen gas was 1.70 mol/L. The value of the equilibrium constant for the reaction at that temperature is 0.429. What was the concentration of the ethyne? Answer in mol/L to 3 decimal places. You may attach an image of your work to support your answer.