How does the bioethanol yield (ml) from the fermentation of 1.5kg of corn, potato, and sugarcane differ under controlled conditions, and what factors influence the efficiency of production?SL
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B
Official IB Result
IB Grade: B
Criteria A: Focus and Method
5/6
0
3
6
Criteria Strands
A.1Topic communication and explanation
Excellent
A.2Research question formulation and focus
Excellent
A.3Research methodology
Good
Criteria Feedback
- Clear and focused research question consistently drives the investigation
- Background and topic are communicated effectively with relevant chemical context
- Overall methodology is coherent and feasible, with a logical step-wise procedure
- Key methodological controls (replication, uncertainty quantification, glucoamylase inclusion) are missing, lowering methodological rigor
- Several apparatus and measurement details (e.g. hydrometer use, calibration, anaerobic seals) are inadequately described
Criteria B: Knowledge and Understanding
5/6
0
3
6
Criteria Strands
B.1Application of source material
Moderate
B.2Subject knowledge
Excellent
B.3Use of terminology and concepts
Excellent
Criteria Feedback
- Demonstrates clear and coherent subject knowledge of enzymatic hydrolysis, fermentation, and stoichiometric calculations
- Consistent and accurate use of chemical terminology and concepts throughout
- Application of a broad range of sources to support theoretical context and calculations
- Reliance on some non‐peer-reviewed sources (e.g. ChatGPT, popular websites) and occasional citation inconsistencies
- Minor inaccuracies in equations (e.g. enzyme empirical formula) and volume conversions
Criteria C: Critical Thinking
7/12
0
6
12
Criteria Strands
C.1Research quality
Moderate
C.2Analysis depth
Poor
C.3Discussion and evaluation
Poor
Criteria Feedback
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- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Criteria D: Presentation
2/4
0
2
4
Criteria Strands
D.1Structure appropriateness
Moderate
D.2Layout considerations
Poor
Criteria Feedback
- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.