Multiple Choice
In a reaction involving 0.0300 M of I-, 0.0300 M of H2O2, and 0.00300 M of S2O3^2-, which of the following expressions correctly represents the rate of reaction?
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15. Chemical Kinetics
Intro to Chemical Kinetics
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Which of the following best describes how the rate of a chemical reaction is measured?
A
By calculating the total mass of the reactants before the reaction
B
By observing the color change of the solution
C
By measuring the temperature change during the reaction
D
By determining the change in concentration of a reactant or product per unit time
Verified step by step guidance1
Understand that the rate of a chemical reaction refers to how fast reactants are converted into products over time.
Recognize that reaction rates are typically measured by monitoring changes in concentration of either reactants or products as the reaction proceeds.
Express the rate mathematically as the change in concentration divided by the change in time, using the formula: \(\text{Rate} = \frac{\Delta [\text{Reactant or Product}]}{\Delta t}\).
Note that while observing color change or temperature change can provide qualitative or indirect information about a reaction, the most precise and standard method involves concentration changes.
Conclude that measuring the change in concentration of a reactant or product per unit time best describes how the rate of a chemical reaction is measured.
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