This PowerPoint lesson covers combining analytical techniques for IBDP Chemistry HL (first examination 2025), helping students determine unknown organic structures using multiple spectra. It provides a clear, step-by-step approach to interpreting and integrating data from mass spectrometry, infrared (IR) spectroscopy and ¹H NMR.
Combining analytical techniques involves using different experimental methods together to identify the structure of a compound. While each technique provides partial information, combining mass spectrometry (molecular mass and fragments), IR spectroscopy (functional groups), and ¹H NMR (proton environments) allows chemists to confidently deduce full molecular structures. This skill is essential for IB HL students and frequently assessed in exam questions.
This fully editable PowerPoint (.pptx) is designed for HL teaching and revision. The lesson begins with a retrieval starter reviewing NMR concepts before building a structured method for analysing unknown compounds. Students are guided through a complete worked example, showing how to combine evidence from all three techniques to identify a compound such as propanoic acid.
The resource includes:
• Retrieval starter activity linking prior spectroscopy knowledge
• Clear definitions of key analytical techniques (mass spectrometry, IR, ¹H NMR)
• Explanation of how each technique contributes different information
• Step-by-step method for identifying unknown compounds
• Interpretation of molecular ion peaks and fragmentation patterns
• Identification of functional groups using IR spectra
• Analysis of chemical shifts, integration and splitting patterns in ¹H NMR
• Fully worked example combining all three techniques
• Emphasis on exam technique and logical reasoning
• Practice questions with answers for consolidation
This lesson is ideal for developing high-level analytical and problem-solving skills, preparing students for IB exam questions that require interpreting multiple data sources to determine molecular structure.
File type included:
• Editable PowerPoint (.pptx)
Last updated: 2026 – enhanced worked example clarity, added structured problem-solving steps, and improved exam-style practice questions aligned to IB HL assessment objectives.
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