Lots of students struggle to decode their Chemistry Internal Assessment grade and assessment.
This is a free grading tool that breaks down the IB Chemistry IA rubric into plain English, so you understand exactly where your scientific investigation stands across all four assessment criteria.
The embedded grader makes self-evaluation faster and more accurate than manual rubric checking, so you're never left guessing.
Note
The grader works in two modes:
Draft Mode: Quick assessment of your work-in-progress. Input your current sections and get instant feedback on which criteria need more work before you finish writing.
Full Mode: Complete evaluation of your finished IA. Input your final project details across all criteria and get a comprehensive grade breakdown with specific improvement suggestions for each section.
Quick Start Checklist
Before you begin, ensure you have the following:
Research Question: A clear and focused question guiding your investigation.
Methodology: Detailed procedure outlining how data was collected.
Raw Data: Comprehensive and organized data collected during the experiment.
Processed Data: Data that has been analyzed, including calculations and statistical analysis.
Graphs and Tables: Visual representations of data with appropriate labels and units.
Chemical Theory - Background research connecting investigation to chemical concepts and principles
Conclusion: A summary of findings addressing the research question.
Evaluation: Reflection on the investigation's strengths, limitations, and possible improvements.
Citations: Properly formatted references for all sources used.
Rubric Breakdown
The Chemistry IA is assessed based on four criteria, each worth up to 6 marks, totaling 24 marks. Below is a breakdown of each criterion:
Criterion A: Research Design (6 marks)
This criterion tests how well you plan and design your chemical investigation.
It evaluates your research question, methodology, and experimental control.
Mark Band
What It Means
Evidence You Must Show
5–6
Comprehensive and well-justified research design.
Clear research question, thorough background, detailed methodology, and control of variables.
3–4
Adequate research design with some justification.
Research question and methodology present but lacking depth or clarity.
1–2
Limited research design with minimal justification.
Unclear research question, insufficient methodology, and poor control of variables.
0
No relevant research design presented.
Absent or entirely inappropriate research question and methodology.
Criterion B: Data Analysis (6 marks)
This evaluates how well you collect, process, and interpret your chemical data.
It tests your ability to analyze patterns and handle uncertainties appropriately.
Mark Band
What It Means
Evidence You Must Show
5–6
Thorough and accurate data analysis with clear interpretation.
Comprehensive data collection, appropriate processing, and insightful interpretation.
3–4
Adequate data analysis with some interpretation.
Sufficient data collection and processing with basic interpretation.
1–2
Limited data analysis with minimal interpretation.
Insufficient data collection, poor processing, and superficial interpretation.
0
No relevant data analysis presented.
Absent or entirely inappropriate data collection and processing.
Criterion C: Conclusion (6 marks)
This assesses how well you answer your research question using your chemical data.
It evaluates your chemical understanding and connection to theory.
Mark Band
What It Means
Evidence You Must Show
5–6
Well-supported conclusions addressing the research question.
Clear linkage between data analysis and conclusions with biological context.
3–4
Conclusions addressing the research question with some support.
Basic linkage between data analysis and conclusions.
1–2
Limited conclusions with minimal support.
Weak linkage between data analysis and conclusions.
0
No relevant conclusions presented.
Absent or entirely inappropriate conclusions.
Criterion D: Evaluation (6 marks)
This tests your ability to critically evaluate your chemical investigation.
It assesses your identification of limitations and realistic improvements.
Mark Band
What It Means
Evidence You Must Show
5–6
Comprehensive evaluation with well-justified improvements.
Detailed analysis of strengths, limitations, and realistic improvements.
3–4
Adequate evaluation with some justified improvements.
Basic analysis of strengths, limitations, and improvements.
1–2
Limited evaluation with minimal improvements.
Superficial analysis of strengths, limitations, and improvements.
0
No relevant evaluation presented.
Absent or entirely inappropriate evaluation.
How to Interpret Your Grade from the Tool
The embedded grader calculates your total score out of 24 marks across all four criteria.
Here's how to interpret your results:
22-24 marks (Grade 7 territory): Excellent work with sophisticated scientific investigation. Minor refinements needed.
19-21 marks (Grade 6 range): Strong investigation with good data analysis. Focus on evaluation depth and biological theory application.
16-18 marks (Grade 5 level): Competent work meeting basic requirements. Strengthen data processing and conclusion justification.
13-15 marks (Grade 4 range): Adequate foundation but needs significant improvement. Review methodology detail and variable control.
Below 13 marks: Major revision required across most criteria. Restructure approach and strengthen experimental design.
Tip
Your IA contributes 20% for both SL and HL to your final Chemistry grade
A strong IA can boost your overall grade significantly, especially if you're borderline between grade bands.
Grade Boundaries & Converting Your Mark
IB Chemistry IA grade boundaries vary by session but your IA contributes significantly to your final grade:
IB Grade
Typical Mark Range
Percentage
7
22-24
91-100%
6
19-21
79-88%
5
16-18
66-75%
4
13-15
54-63%
3
10-12
42-50%
2
7-9
29-38%
1
0-6
0-25%
Subject-Specific Tips
Reaction Kinetics:
Measure initial rates rather than overall reaction time for more accurate kinetic analysis.
Use appropriate temperature control and timing methods for reliable rate measurements.
Equilibrium Studies:
Allow sufficient time for equilibrium establishment and confirm equilibrium through repeated measurements.
Use colorimetric or titration methods for quantitative equilibrium position determination.
Acid-Base Chemistry:
Calibrate pH meters properly and use appropriate indicators for titration endpoints.
Include buffer solutions and ionic strength considerations in your analysis.
Thermochemistry:
Use calorimetry with proper insulation and temperature measurement techniques.
Calculate specific heat capacity and heat losses to improve accuracy.
Electrochemistry:
Ensure proper electrode preparation and stable electrical connections throughout measurements.
Consider concentration effects and temperature dependence of cell potentials.
Common Mistake
And quick fixes:
Vague research question → Make it specific with clear variables, units, and controlled conditions
Insufficient data points → Collect minimum 5 data points per variable with multiple trials
Poor variable control → Identify and control all variables except your independent variable
Missing uncertainties → Include measurement uncertainties, error bars, and uncertainty propagation
Weak data processing → Show sample calculations, use appropriate graphs, and include statistical analysis
Superficial conclusion → Quantify results, reference specific data, and connect to chemical theory
Generic evaluation → Identify specific limitations and suggest realistic, detailed improvements
Word count violations → Stay within 3,000 words - only first 3,000 words are marked
Missing safety protocols → Address chemical hazards, disposal methods, and safety equipment used
Poor graph presentation → Include proper titles, axis labels, units, error bars, and trend lines
FAQs
How long should my Chemistry IA be?
Maximum 3,000 words - focus on clear scientific communication and stay within the limit.
Can I use digital simulations instead of lab experiments?
Yes, virtual experiments and database analysis are acceptable if properly justified and scientifically rigorous.
Should I include statistical tests?
Basic statistics (mean, standard deviation, correlation) are expected. Advanced tests enhance higher-level analysis.
How many trials should I perform?
Minimum 3-5 trials per data point, but more trials improve statistical reliability.
What if my results don't match literature values?
Discrepancies are acceptable - focus on explaining differences using chemical principles and experimental limitations.
Can I collaborate with other students?
Limited collaboration allowed for data collection but each student must have unique research question and individual analysis.
How detailed should my method be?
Detailed enough for exact replication - include equipment specifications, concentrations, timing, and measurements.
Should I include preliminary experiments?
Yes, preliminary work demonstrates good research design and helps justify methodology choices.
What chemical topics work well for IAs?
Reaction kinetics, equilibrium studies, acid-base chemistry, thermochemistry, and electrochemistry are popular and work well.
How important is chemical theory integration?
Very important - connect your results to specific chemical concepts from the IB syllabus throughout your IA.
Use the Free Chemistry IA Grader Now
Stop guessing about your grade.
The comprehensive grading tool evaluates your IA against all four official criteria, giving instant feedback on strengths and improvement areas.
Input your investigation details and get a preliminary grade calculation that helps you focus revision efforts where they matter most.
Chemistry-specific analysis helps you master the experimental design and data analysis that separate excellent from average Chemistry IAs.
IB Chemistry IA AI Grader Tool
How the IB Chemistry IA Grader Works and Frequently Asked Questions
Why Use Our Coursework Grader?
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