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The Reaction Order Curve Fitting tool in CHEMIX School is designed to determine the reaction order of a chemical process using experimental data. It supports:

• Zero-Order

• First-Order

• Second-Order

Visual feedback is provided through plotted data and fitted curves, helping users identify the best-fit reaction model.

Features

Supported Reaction Orders and Curve Colors

• Zero-Order: Red curve

• First-Order: Warm-Light-Brown curve

• Second-Order: Blue-Violet curve

Each order's curve is displayed in a unique color for easy distinction.

How to Use

1. Data Entry

• Input experimental data in the edit field.

• Each line must contain a pair of values:

  • X = Concentration

  • Y = Time

• Use a space to separate X and Y. Use Enter to start a new pair.

Example Input:

0.1   0.01  
10    0.009  
20    0.008

2. Running the Fit

• Click the "Calculate" button.

• The tool fits your data to Zero-, First-, and Second-Order models.

• Curves are plotted in the left half of the window.

3. Legend Management

• Color-coded Legend:

  • Red = Zero-Order

  • Brown = First-Order

  • Violet = Second-Order

• Move legends: Click and drag using the left mouse button.

• Hide legends: Uncheck the "Show legend" checkbox.

4. Zooming In and Out

• Zoom in: Use the right mouse button to draw a zoom rectangle.

• Reset zoom: Right-click without moving the mouse.

5. Additional Display Options

• Grid: Enable the "Grid" checkbox to show a background grid.

• Copy Plot: Click the two-colored rectangle button to copy the plot image to the clipboard.

6. Correlation & Best-Fit Information

• Located below the plot:

  • Shows equations for each reaction order.

  • Displays correlation coefficients.

  • The best-fit model is marked with “(Best)”.

• Also shown in a separate edit field for easy copying with the mouse.

• All info is included in clipboard image when copied.

Summary

This tool offers an intuitive and visual way to analyze reaction kinetics. With support for standard reaction orders, interactive plotting, zooming, and best-fit detection, it provides chemists and educators with a powerful analytical tool.

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