Chemistry > AQA Question Papers > CHEM 1046 MIDTERM PRETEST QUESTIONS LATEST 2023 (All)

CHEM 1046 MIDTERM PRETEST QUESTIONS LATEST 2023

Document Content and Description Below

CHEM 1046 MIDTERM PRETEST QUESTIONS LATEST 2023 1. What is the intermediate in the following mechanism? A + B  C + D B + D  X A) A B) B C) C D) D E) X 2. Calculate the activation en ... ergy of a reaction that has a rate constant of 4.41 x 10-3s- 1 at 78 K and rate constant of 9.79 x 10-2s-1 at 315 K. A) 2.67 kJ/mol B) 2.90 kJ/mol C) 0.0589 kJ/mol D) 22.4 kJ/mol E) 200.34KJ/mol 3. A chemical reaction that is 1st order in X is observed to have a rate constant of 1.2 X 10-2/sec. If the initial concentration of X is 2.0M, what is the concentration of X after 200 sec? A) [A]200 = 0.18 mol/L B) [A]200 = 0.32 mol/L C) [A]200 = 0.23 mol/L D) [A]200 = 0.67 mol/L 4. For a certain second-order decomposition reaction, the rate is determined to be 0.30 mol /L•sec when the concentration of the reactant is 2.0M. What is the rate constant of the reaction? A) k = 0.023 L/mol sec B) k = 0.045 L/mol sec C) k = 0.075 L/mol sec D) k = 0.034 L/mol sec E) k = 0.005 L/mol sec 5. The rate constant for a reaction is 1.3/(M • s) at 700K and 23/(M • s) at 800K. What is the activation energy? A) Eact = 133,000 J B) Eact = 103,000 J C) Eact = 122,000 J D) Eact = 120,000 J E) Eact = 200,000 J 6. A certain radioactive decay process (1st order) is 45% complete in 65 sec. What are the rate constant and half-life for this process? A) k = 9.31 x 10-3/sec and t1/2 =74sec B) k = 3.34 x 10-3/sec and t1/2 =22sec C) k = 6.33 x 10-3/sec and t1/2 =56sec D) k = 2.31 x 10-3/sec and t1/2 =89sec E) k = 4.38 x 10-3/sec and t1/2 =14sec [Show More]

Last updated: 2 years ago

Preview 1 out of 7 pages

Buy Now

Instant download

We Accept: