The following information is used for the next two questions: Suppose you graduate from college today at age 23 (time t=0) and want to retire at age 60 (time t=37).  You expected earn an effective annual rate of 10% on your retirement savings.  You will make equal, end-of-the-year deposits to your account, with the goal to have $3,000,000 in your retirement account when you retire. ———— Instead of listening to your parents’ advice, you spend more money and save nothing for retirement for the first seven years out of college. After turning 30, reality hits and you decide you need to start saving towards your retirement goal.  You make your first deposit at the end of that year when you turn 31 (t=8)and continue making annual deposits until your last deposit at age 60 (t=37). Relative to the amount you needed to save per year if you started shaving right out of college (i.e., relative to your answer to the previous answer), about how much larger do your deposits now have to be given the 7-year delay?

For a first order reaction with half-life of 126 seconds, a) Calculate the rate constant for the reaction. (2 points)b) How much time would the reaction take for 12.5% to be left remaining? (1 points) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Consider the reaction at equilibrium:         I2(g) + Cl2(g) ⇌ 2 ICl(g)         Kc = 0.11 Calculate the equilibrium concentration (in M) of ICl when 0.45 mol I2 and 0.45 mol Cl2 are initially mixed in a 2.0L flask. (5 pts.) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

For a first order reaction with half-life of 126 seconds, a) Calculate the rate constant for the reaction. (2 points)b) How much time would the reaction take for 12.5% to be left remaining? (1 points) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Consider the reaction at equilibrium:         Fe3+(aq) + SCN-(aq) ⇌  FeSCN2+(aq)          A sollution is made containing an initial of 1.11 ×10-4 M and an initial of 1.00 ×10-4 M. At equilibrium = 1.70 ×10-4 M. Calculate the value of the equilibrium  constant (Kc) for the above reaction. (5 pts.) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Write an equilibrium expression (Kc or Kp) for each chemical reaction. (4 pts.) a) (Kc) 2H2O(l) ⇌H3O+(aq) + OH-(aq) b) (Kp) 2Ag2O(s) + H2(g) ⇌ 4Ag(s) + 2H2O(g) c)  (Kc) HCO3-(aq) + H+(aq) ⇌ H2O(l) + CO2(g)         d)  (Kp) C(s) +CO2(g) ⇌2 CO(g) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Consider the reaction. (Write your answer including its units in the textbox below.  specify answer for part a. and part b.)                      2 N2O(g) → 2 N2(g) + O2(g) a. Express the rate of the reaction in terms of the change in concentration of each of the reactants and products. (2 pts.) b. If 0.015 mol of N2 is produced in a 0.500 L vessel within 15 seconds, what is the rate of reaction with respect to N2 (ΔN2/Δt)? How about with respect to O2? (4 pts) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Consider the reaction at equilibrium:         Fe3+(aq) + SCN-(aq) ⇌  FeSCN2+(aq)          A sollution is made containing an initial of 1.11 ×10-4 M and an initial of 1.00 ×10-4 M. At equilibrium = 1.70 ×10-4 M. Calculate the value of the equilibrium  constant (Kc) for the above reaction. (5 pts.) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Consider the reaction:        2 H2S(g) ⇌ 2 H2(g) + S2(g)                   Kp = 2.40 x 10-4 @ 1073K A reaction mixture contains 0.112 atm H2, 0.055 atm S2, and 0.445 atm H2S. a) Calculate the reaction quotient (Qp) (3pts)    b) What direction is the reaction going. (Left      Right     Neither) (2pts) c) Calculate the Kc for the reaction given above. (2 pts) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.

Consider the reaction:        2 H2S(g) ⇌ 2 H2(g) + S2(g)                   Kp = 2.40 x 10-4 @ 1073K A reaction mixture contains 0.112 atm H2, 0.055 atm S2, and 0.445 atm H2S. a) Calculate the reaction quotient (Qp) (3pts)    b) What direction is the reaction going. (Left      Right     Neither) (2pts) c) Calculate the Kc for the reaction given above. (2 pts) **This question copyright of Dr. Simon Tang @ Valencia College. No permission for redistribution of this question.