slope of concentration vs time graph


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Ryan Thompson 2J
Posts: 71
Joined: Fri Sep 29, 2023 12:05 pm

slope of concentration vs time graph

Postby Ryan Thompson 2J » Sun Mar 17, 2024 9:30 pm

what does the slope indicate in the concentration vs time? does it change with order of the reaction?

hadydamaj27
Posts: 88
Joined: Fri Sep 29, 2023 12:32 pm

Re: slope of concentration vs time graph

Postby hadydamaj27 » Sun Mar 17, 2024 9:33 pm

The slope indicates the rate of the reaction. It does change with the order of the reaction. For zero order, the rate remains constant. For first order, it decreases exponentially with time. For second order, it increases logistically.

906013563
Posts: 41
Joined: Fri Sep 29, 2023 1:19 pm

Re: slope of concentration vs time graph

Postby 906013563 » Sun Mar 17, 2024 9:33 pm

The slope in a concentration versus time graph represents the rate at which reactants are consumed or products are formed in a chemical reaction. This rate changes with the order of the reaction.
For a zero-order reaction: the slope is constant, indicating a constant rate of reaction that does not depend on the concentration of reactants.

In first-order reactions: the slope decreases exponentially over time, reflecting a rate dependent on the concentration of a single reactant.

For second-order reactions: the rate of decrease in concentration becomes faster as the reactant concentration decreases, indicating a rate that depends on the square of the concentration of one reactant or the product of the concentrations of two reactants. Therefore, the nature of the slope on such a graph tells us the reaction order and kinetics.

Mariyam Oladele 1E
Posts: 80
Joined: Fri Sep 29, 2023 12:20 pm

Re: slope of concentration vs time graph

Postby Mariyam Oladele 1E » Sun Mar 17, 2024 9:35 pm

In a plot of concentration of reactants vs time the slope indicates the value of the rate constant (k). For zero order reactions the rate is (-)slope, for first order the rate is also (-)slope, but for second order reactions the rate constant is (+)slope.

Maegan Abutin 2C
Posts: 78
Joined: Fri Sep 29, 2023 10:44 am

Re: slope of concentration vs time graph

Postby Maegan Abutin 2C » Sun Mar 17, 2024 9:36 pm

Hi. In the concentration vs. time graph, the slope shows the rate of reaction at a certain time. However, this can change depending on the order of the reaction. Zero order reactions have constant negative slopes. First order reactions have exponential decay curves. Second order reactions have curves that are not linear and change depending on reaction concentrations.

106062642
Posts: 42
Joined: Wed Nov 15, 2023 9:21 am

Re: slope of concentration vs time graph

Postby 106062642 » Sun Mar 17, 2024 9:36 pm

The slope of the tangent line at any given position in a concentration vs. time plot for a chemical reaction indicates the rate of the reaction at that particular point in time. The change in reactant or product concentration per unit of time is known as the reaction's rate. Therefore, the rate of reaction at that particular moment increases with the steeper slope of the tangent line.


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