3. Which of the following best describes the changes in reaction rate for the reactants as a reactionprogresses?a. Reaction rate remains relatively constant for the duration of the reactionb. Reaction rate is highest at the beginning, and decreases over timeC.Reaction rate is highest at the beginning and end of a reactiond. Reaction rate is slow at first, then increases4. Which of these would be the closest to being an isolated system?a.A well-insulated steel thermosb. EarthC.A sealed plastic containerd. All of the above are examples5. A chemical engineer is performing a test to see if a proposed catalyst for an industrial chemical reaction isworking effectively. Which of the following would be positive evidence that it's working?a. The enthalpy of the reaction increasesb. Less heat is required to get the reaction startedC.The reaction creates new productsd. The enthalpy of the reaction decreases

Step 1: ##3. Which of the following best describes the changes in reaction rate for the reactants as…

Answered: 3. Which of the following best…

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU6: Showtime: Reversible Reactions And Chemical Equilibrium

SectionU6.2: How Backward: Reversible Reactions

Problem 5E

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Increasing the temperature at which a chemical reaction occursa. will lower the activation energy. What is the correct answer?b. causes more reactant collisions to take place in a given timec. increases disorder in the system, thus decreasing the reaction rated. more than one correct responsee. no correct responsef. NoneChemical equilibrium is reached in a system when. What is the correct answer?a. complete conversion of reactants to products has occurredb. reactant and product concentrations are equalc. reactants are being consumed at the same rate they are being producedd. more than one correct responsee. no correct responsef. None In writing an equilibrium constant expression, which of the following is incorrect?What is the correct answer?a. Concentrations are always expressed in molarities.b. Product concentrations are always placed in the numerator of the expression.c. Concentrations of pure solids and pure liquids are always placed in the denominator of the expression.d. More…
_9. Which one of the following sets of reactants is most likely to have the slowest rate of reaction? a.A covalent compound in solution and an ionic substance in solution. b.Two ionic substances in solution. c.Two solid ionic substances. d.Two covalent compounds in solution. 10. A catalyst that slows down a chemical reaction is known as a, an enzyme b. an inhibitor C. a heterogeneous catalyst d. a converter
10.a. A student performed the following kinetic isotope effect experiment. • The reaction below took 15 min to achieve completion. H3C H3C HI Br D3C • The reaction below (note deuterium replacement) took 60 min to achieve completion. CD3 D3C D H Br This group is isopropyl, going backwards into paper NaOEt EtOH -CD3 NaOEt EtOH D Draw the correct mechanism(s) and product(s) for the top reaction with H-labeled reactant. Show stereochemistry clearly.
I. Which of the following statements about catalysts is FALSE? A. biological catalysts are called enzymes B. catalysts do not appear in the balanced equation C. catalysts initiates a chemical reaction D. catalysts reduce the activation energy for a reaction II. Collision theory assumes that the rate of a reaction is dependent on which factor/s? A. change in energy between the products and the reactants B. change in free energy between the reactants and products. C. energy of collisions and the orientation of colliding molecules. D. energy of collisions and heat of reaction
A catalyst: I) lowers activation energy II) uses an existing reaction pathway III) is not consumed in the reaction and therefore does not appear in the chemical equation of each mechanism IV) speeds up a reaction V) is homogeneous if it is in a different phase than the reactants I, III, and IV I, IV, and V II, III, and IV II and IV I, II, IV, and V
Consider the reaction profile shown in image. The activation energy of the reaction is represented by the difference in energy between points_________. a. A and D b. A and C c. B and C d. A and B
NOTE: II only is the incorrect answer.
Which of the following statements is/are true for the reaction shown below? I. The reaction is step-wise II. The reaction is exergonic III. The reaction rate will increase at higher temperature Reaction Coordinate O I. only O II. only II. and II. O I., II., and III. Energy
14. How molecules must be oriented to each other in order for a reaction to occur is part of the a. reaction rate b. activation energy c. reaction mechanism d. determination if a reaction is spontaneous
14. Why does the rate of the reaction decrease over time? A. Exothermic reactions lose heat which cools the reaction which decreases the reaction rate. B. As the reaction proceeds, the concentration of the products results in fewer collisions. C. As the reaction proceeds, a decrease in the concentration of reactants results in fewer successful collisions. D. Not all molecules will react and some choose to stay in their present form. E. none of the above
Reaction Conc. Na2S203 Conc. HCI Δ Abs. A Time (s) Rate (Δ Abs./Δ Time) 1 0.10 M .30 M 1.3686611 1.007568 1.358380874 2 0.10 M .15 M 1.5360817 0.300349 5.114311671 3 0.050 M .30 M 1.2267196 0.01870913 65.56796601 4 0.025 M .30 M 0.9563164 0.02870913 11.3085840 POSTLAB QUESTIONS 2. Compare the rates of reactions 1 and 2. What is effect on the reaction rate of halving the acid concentration? What is the order of the reaction in hydrochloric acid?
Label the graph to the right with the items on the left. a. Products b. Transition state c. Activation energy d. Potential energy e. Catalyzed reaction f. Reaction progress g. Uncatalyzed reaction h. Reactants i. AH of the reaction

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