Homework Answers
The proposed reaction rate law is
-dc/dt = k [Ac]x[Br2]y[H+]z
Find pairs of experiments where the concentrations of only one reactant are different
From lines 1 and 2 : y = 0 ( [Br2] varies, but the reaction rate is constant)
From lines 3 and 4: z =1 (4 times higher [H+], the same for the reaction rate)
From lines 1 and 5: x = 1 (6x10-3/ 0.30)x = (8x10-3/0.40)x
Answer: -dc/dt = k [Ac][H+]
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The Bromination of acetone is acid catalyzed; The rate of disappearance of bromine as measured for...
26. Questions 26-27 refer to the following information. The reaction of acetone and bromine can be...
26. Questions 26-27 refer to the following information. The reaction of acetone and bromine can be acid catalyzed as shown in the above reaction. The following initial rates of the bromination of acetone using an acid catalyst were measured at various initial concentrations as recorded in the table below. Trial [CH, COCH] Br] [H'] Initial Rate (Ms) catalyst 0.30 0.30 0.30 0.40 0.40 0.0500.050 0.10 0.050 0.050 0.050 0.050 0.050 0.10 0.20 5.7 x10- 5.7 x10 1.2 x104 3.I x10...
In step I the alpha bromination of ketones is acid catalyzed.
1. In step I the alpha bromination of ketones is acid catalyzed. a. What acid is formed as Step 1 progresses? b. Why are alpha bromination reactions acid catalyzed? 2. Substitution of bromine by t-butyl amine is the second step of the reaction today. Secondary alkyl halides can undergo substitution by Sn1 or Sn2 mechanisms. Explain (in terms of electronic interactions) why an Sn2 mechanism is favored when the halogen is alpha to a carbonyl. (Hint: Like charges on adjacent atoms are unfavorable)
Bromination of cinnamic acid. The styrene in carbon tetrachloride solution easily adds bromine at -15 °...
Bromination of cinnamic acid. The styrene in carbon tetrachloride solution easily adds bromine at -15 ° .Why does cinnamic acid require more drastic conditions for the reaction to take place at a reasonable rate?
Draw the mechanism of the bromination reaction between trans cinnamic acid and bromine. Be sure to...
Draw the mechanism of the bromination reaction between trans cinnamic acid and bromine. Be sure to include stereochemistry( wedge and dashed structures). The product obtained was the racemic mixture of (2R,3S) and (2S,3R) of 2,3-dibromo-3-phenylpropanoic acid.
Rate of Disappearance/Rate Constant
Consider the reaction of peroxydisulfate ion (S2O8^2-)(Aq) with iodide ion (I-) in aqueous solution: (S2O8^2-)(Aq)+(3I-)(Aq)---->2SO4^2-+(I3-)(Aq).At a particular temperature the rate of disappearance of S2O8^2 varies with reactant concentrations in the following manner:Experiment S2O8^2- I- Initial Rate1 0.018 0.036 2.6x10^-62 0.027 0.036 3.9x10^-63 0.036 0.054 7.8x10^-64 0.050 0.072 1.4x10^-51) Determine the rate law for the reaction.Apparently the rate law is Rate=[S2O8^2-][I-]How did they come up with this?2)How is the rate of disappearance ofS2O8^2- related to the rate of disappearance of [I-]...
Consider the following reaction on acetone (CH3COCH3), the mechanism is believed to involve four elementary steps:...
Consider the following reaction on acetone (CH3COCH3), the mechanism is believed to involve four elementary steps: CH3COCH; 4+ CH3 + CH3CO CH3 + CH3COCH; CH4 + CH3COCH, CH;COCH2 _ky → CH3 + CH2CO CH3 + CH3COCH, ko > CH3COCZH (a) Write down an expression for the rate of disappearance of CH3COCHz. (3 marks) Assume kz >> k[CH3), apply the steady-state approximation and work out an expression for (CH3) in term of kį, kz, kz and ke. Show all of your...
2. [Chang, 9.39] The rate-determining step of the bromination of acetone involves breaking a carbon-hydrogen bond....
2. [Chang, 9.39] The rate-determining step of the bromination of acetone involves breaking a carbon-hydrogen bond. Estimate the ratio of the rate constants kc-/kc-n for the reaction at 300 K. The frequencies of vibration for these particular bonds are VC- H 3000 cm-1 and VC- D 2100 cm-1. The wavenumber (ū) is given by v/c, where v is the frequency in s and c is the speed of light in a vacuum (3.00 x 10 m.s ).
Bromate ions react with bromide ions and protons to form bromine and water. Broj + Br...
Bromate ions react with bromide ions and protons to form bromine and water. Broj + Br + _ H → _ Br2 + H2O a. Balance the reaction (Hint: it is a redox reaction) b. The initial rate is 5.4 x 10 mol/Ls when the initial concentrations of the reactants are: (Bro, J. = 0.20 M, (Br), = 0.10 M and [H]. = 0.15 M. When the [Br03 ). is changed to 0.10 M, the observed rate is 2.7 x...
Part A The rate of the reaction in terms of the "disappearance of reactant" includes the...
Part A The rate of the reaction in terms of the "disappearance of reactant" includes the change in the concentration of the reactant, the time interval, and the coefficient of the reactant Consider the following reaction: 2A + 3B 3C + 2D The concentrations of reactant A at three different time intervals are given. Use the following data to determine the average rate of reaction in terms of the disappearance of reactant A between time=0s and time = 20 S....
The rate of the reaction in terms of the "disappearance of reactant" includes the change in...
The rate of the reaction in terms of the "disappearance of reactant" includes the change in the concentration of the reactant, the time interval, and the coefficient of the reactant. Consider the following reaction: 2A+3B→3C+2D The concentrations of reactant A at three different time intervals are given. Use the following data to determine the average rate of reaction in terms of the disappearance of reactant A between time = 0 s and time = 20 s. Time (s) 0 20...
26. Questions 26-27 refer to the following information. The reaction of acetone and bromine can be acid catalyzed as shown in the above reaction. The following initial rates of the bromination of acetone using an acid catalyst were measured at various initial concentrations as recorded in the table below. Trial [CH, COCH] Br] [H'] Initial Rate (Ms) catalyst 0.30 0.30 0.30 0.40 0.40 0.0500.050 0.10 0.050 0.050 0.050 0.050 0.050 0.10 0.20 5.7 x10- 5.7 x10 1.2 x104 3.I x10...
Consider the following reaction on acetone (CH3COCH3), the mechanism is believed to involve four elementary steps: CH3COCH; 4+ CH3 + CH3CO CH3 + CH3COCH; CH4 + CH3COCH, CH;COCH2 _ky → CH3 + CH2CO CH3 + CH3COCH, ko > CH3COCZH (a) Write down an expression for the rate of disappearance of CH3COCHz. (3 marks) Assume kz >> k[CH3), apply the steady-state approximation and work out an expression for (CH3) in term of kį, kz, kz and ke. Show all of your...
2. [Chang, 9.39] The rate-determining step of the bromination of acetone involves breaking a carbon-hydrogen bond. Estimate the ratio of the rate constants kc-/kc-n for the reaction at 300 K. The frequencies of vibration for these particular bonds are VC- H 3000 cm-1 and VC- D 2100 cm-1. The wavenumber (ū) is given by v/c, where v is the frequency in s and c is the speed of light in a vacuum (3.00 x 10 m.s ).
Bromate ions react with bromide ions and protons to form bromine and water. Broj + Br + _ H → _ Br2 + H2O a. Balance the reaction (Hint: it is a redox reaction) b. The initial rate is 5.4 x 10 mol/Ls when the initial concentrations of the reactants are: (Bro, J. = 0.20 M, (Br), = 0.10 M and [H]. = 0.15 M. When the [Br03 ). is changed to 0.10 M, the observed rate is 2.7 x...
Part A The rate of the reaction in terms of the "disappearance of reactant" includes the change in the concentration of the reactant, the time interval, and the coefficient of the reactant Consider the following reaction: 2A + 3B 3C + 2D The concentrations of reactant A at three different time intervals are given. Use the following data to determine the average rate of reaction in terms of the disappearance of reactant A between time=0s and time = 20 S....
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