IB Chemistry Standard Level (SL) 2025 – 400 Free Practice Questions to Pass the Exam

The main principle of spectroscopy revolves around the study of the interaction between light and matter. This field of study explores how different substances absorb, emit, or scatter light when subjected to electromagnetic radiation. When light interacts with matter, it can provide valuable information about the structure, composition, and properties of the substances. Different types of spectroscopy, such as UV-Vis, infrared (IR), and nuclear magnetic resonance (NMR), leverage this interaction to investigate various aspects of the material being analyzed.

The significance of this principle is that it allows chemists and scientists to identify and quantify the different components of a sample based on the specific wavelengths of light absorbed or emitted, which correspond to the energy levels of electrons in molecules. This interaction is fundamental in many analytical techniques and applications, including chemical analysis, the identification of compounds, and studying molecular structures.