The CHEMIX
School allows you to analyze chemical kinetics by
fitting experimental data to Zero-Order, First-Order, and
Second-Order reaction models.
Fig. Determine reaction order in chemical kinetics by curve fitting - Screen shot from CHEMIX School
Use the data input field to enter concentration (X-axis) and time (Y-axis) pairs.
Each data pair must be
separated by at least a space (e.g., 1.2 5.0).
New data pairs must be entered on a new line.
Example:
0
0.01000
10 0.00909
20 0.00833
40 0.00714
60 0.00625
80 0.00556
100 0.00500
120 0.00455
140 0.00417
160 0.00385
180 0.00357
200 0.00333
Click the Calculate button to fit the entered data to:
Zero-Order model
First-Order model
Second-Order model
The fitted curves and data points will be plotted in the left half of the main window.
Data points are displayed as black dots.
Fitted curves are color-coded:
Red: Zero-Order
Warm-Light-Brown: First-Order
Blue-Violet: Second-Order
To display identifying labels (colored lines before each curve):
Check the "Show label" checkbox.
Red line = Zero-Order
Warm-Light-Brown line = First-Order
Blue-Violet line = Second-Order
To move a label: Click and drag with the left mouse button.
To remove a label: Uncheck the "Show label" checkbox.
Right-click and drag to select a zoom area.
Right-click without moving the mouse to reset zoom to the original view.
Click the button with two colored rectangles to copy the entire plot, including:
Data points
Fitted curves
Correlation and best-fit functions
Labels (if enabled)
Below the plot (left side), the correlation coefficients and best-fit equations for all three reaction orders are displayed.
This information is included in the clipboard image.
To copy the textual best-fit data:
Use the edit field at the bottom-left of the window.
Select and copy using the mouse.
Enable or disable a background grid using the "Grid" checkbox.