The evaluation is one of the highest-scoring sections of the Chemistry IA —
yet most students write it in a rushed paragraph.
Here's how to write a clear, structured, examiner-friendly evaluation.
🧪 1. Identify 3–4 Major Weaknesses
Examiners don't want:
❌ "Human error occurred."
❌ "We could have used more accurate tools."
They want:
✔️ Specific
✔️ Scientific
✔️ Measurable weaknesses
Examples:
- Reaction mixture not fully sealed → gas loss
- Colour change judged by eye → subjective error
- Temperature fluctuations → kinetic changes
🛠 2. Propose Real Improvements
Each weakness must have a realistic improvement.
❌ "Use better equipment."
✔️ "Replace manual titration with an automatic titrator to reduce end-point variability."
📉 3. Show How It Affects Accuracy or Reliability
For each weakness → explain:
- How it affected results
- Whether it caused systematic or random error
- How your improvement fixes it
This is where marks jump.
📊 4. End With a Judgement
One sentence:
"The reliability of the conclusion is limited due to the experimental weaknesses identified, particularly X and Y."
Clear. Mature. Examiner-friendly.
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