18 Questions
What is the Rate law equation in the context of this experiment?
Rate = k' [I-]^p [H2O2]^q
How is the Rate law equation rearranged in logarithmic form?
Log (Rate) = p log [I-] + C
What does a straight line plot of log (Rate) vs log [I-] indicate in this experiment?
The slope of the line represents the order of the reaction with respect to iodide ion concentration.
How is the order of the reaction with respect to hydrogen peroxide determined?
By observing the effect of hydrogen peroxide on the reaction rate in trials 5-8.
What is the significance of the constant C in the logarithmic form of the rate equation?
Constant C represents the combined constants log k' and log c.
In what form is the rate equation expressed to show a linear relationship?
y = mx + b
What is the order of the reaction with respect to the hydrogen peroxide (H2O2) in the given reaction?
q
How is the order of a reactant (p or q) determined in a reaction?
Experimentally
What is the rate law expression for the given reaction?
Rate = k' [I-]^p[H2O2]^q
What is the significance of holding [H3O+] constant in the experiment?
To have a measurable rate for the reaction
How does the logarithmic form of the rate equation look like?
ln(Rate) = ln(k') + pln([I-]) + qln([H2O2])
What is the relationship between the specific rate constant k' and the general rate constant k in the given reaction?
k' = k[H3O+]
What is the significance of maintaining a constant iodide ion concentration during the reaction?
To ensure a fixed amount of I3- is produced, which is indicated by the appearance of the blue I3- - starch complex.
How is the rate of the reaction defined in terms of the moles of I3- produced?
Rate = ∆ mol I3 / ∆t
Why is the rate of the reaction not determined by the time required to deplete the reactants?
The rate is based on the time required to generate a preset number of moles of I3-.
How are reaction rates affected by temperature changes?
Higher temperatures increase the kinetic energy of reactant molecules, leading to faster reaction rates.
What role does the order of reaction with respect to hydrogen peroxide play in determining the reaction rate?
The order of reaction with respect to hydrogen peroxide affects how the rate of reaction changes with its concentration.
How does the formation of the I3- - starch complex indicate the progress of the reaction?
The appearance of the deep-blue I3- - starch complex signals the quantitative amount of S2O32- ions have reacted.
This quiz focuses on determining the order (p) of a reaction with respect to Iodide ion (I-) based on experimental trials and rate law equations. The rate law equation and its logarithmic form are central to understanding the relationship between reaction rate and Iodide ion concentration.
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