Concentration vs. Time Graphs
Flashcard
•
Chemistry
•
11th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a concentration vs. time graph?
Back
A concentration vs. time graph shows how the concentration of a reactant or product changes over time during a chemical reaction.
2.
FLASHCARD QUESTION
Front
Define the rate law expression.
Back
The rate law expression relates the rate of a chemical reaction to the concentration of its reactants, typically in the form: rate = k[A]^m[B]^n, where k is the rate constant, and m and n are the orders of the reaction with respect to reactants A and B.
3.
FLASHCARD QUESTION
Front
What does a second-order reaction mean?
Back
A second-order reaction means that the rate of reaction is proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.
4.
FLASHCARD QUESTION
Front
How can you determine the order of a reaction from a concentration vs. time graph?
Back
The order of a reaction can be determined by analyzing the shape of the graph: a straight line of [A] vs. time indicates zero order, a straight line of ln[A] vs. time indicates first order, and a straight line of 1/[A] vs. time indicates second order.
5.
FLASHCARD QUESTION
Front
What is the significance of the slope in a ln[A] vs. time graph?
Back
In a first-order reaction, the slope of the ln[A] vs. time graph is equal to -k, where k is the rate constant.
6.
FLASHCARD QUESTION
Front
What does the rate constant (k) represent?
Back
The rate constant (k) is a proportionality factor that relates the rate of a reaction to the concentrations of the reactants, and it is specific to a given reaction at a specific temperature.
7.
FLASHCARD QUESTION
Front
What is the relationship between half-life and the order of a reaction?
Back
For first-order reactions, the half-life is constant and independent of concentration. For second-order reactions, the half-life increases as the initial concentration decreases.
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