How does 125ml solution of hydrochloric acid in varying concentrations (10%, 20%, 40%, 60%, 80%, 100%) affect the corrosion rate of different iron based alloy screws after 2 hours of submersion?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
- Research question is clearly stated, narrowly focused and drives the investigation throughout.
- Topic is communicated accurately with clear purpose, linking background, theory and conclusion coherently.
- Methodology shows thoughtful planning (preliminary trials, uncertainty treatment) and effective selection of gas‐collection and gravimetric methods.
- Controlled-variables and dependent-variable tables are left blank, hindering reproducibility.
- Minor lapses in expression and occasional redundancy interrupt the otherwise clear narrative.
- Methodological gaps (unknown alloy composition, unmonitored pH/temperature) limit the completeness of the design.
Criteria B: Knowledge and Understanding
4/6
0
3
6
Criteria Strands
B.1Application of source material
Moderate
B.2Subject knowledge
Good
B.3Use of terminology and concepts
Excellent
Criteria Feedback
- Subject knowledge of electrochemical corrosion and uncertainty propagation is clear and coherent.
- Correct corrosion‐rate and mean‐value equations are introduced with variable definitions and largely effective source use.
- Terminology (anodic/cathodic, passivation, percentage uncertainty) is accurate and consistent throughout.
- Application of source material in data interpretation is limited, relying mostly on student’s own results.
- Minor errors (stoichiometry typo, incorrect density unit) indicate lapses in proofreading and depth of technical application.
- External literature integration is shallow, supporting theory but not woven into analysis.
Criteria C: Critical Thinking
8/12
0
6
12
Criteria Strands
C.1Research quality
Moderate
C.2Analysis depth
Moderate
C.3Discussion and evaluation
Moderate
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
3/4
0
2
4
Criteria Strands
D.1Structure appropriateness
Good
D.2Layout considerations
Good
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.