Nams: correct answer on Multiple choice, each question is worth 4 points Write the letter to the co 1. Which of the following is true about a system at equilibrium? ) The concentration(s) of the reactants) is equal to the concentration(s) of the productts) B) No new product molecules are formed The rate of the reverse reaction is equal to the rate of the forward reaction and both rates are equal to zero C) The concentration(s) of reactantÃs) is constant over time. D) E) None of the above (A-D) are true 2. Equilibrium is reached in chemical reactions when: A) the rates of the forward and reverse reactions become equal. B) the concentrations of reactants and products become equal. C) the temperature shows a sharp rise O) all chemical reactions stop. E) the forward reaction stops. Vhich expression correctly describes the equilibrium constant for the following reaction? K-(4[CO2l+2H20]1)/(2[C2H2]+5[O2]) K = ( [CO2][H2O] ) / ( [C2H2][O2] ) der the chemical system Co+ Ch coCh: K-4.6 x 10 L/mol. centration of the product were to double, what would happen to the equilibrium constant? ould double its value. ould become half its current value. uld quadruple its value. uld not change its value. ld depend on the initial conditions of the product. for A2 +2B2AB, then for 4AB 2A2+4B, K would equal: n NO(g) + ½Odg,--NO2(g) at 750°C, the equilibrium constant Kc equals: