Chemistry Extended Essay Exemplar: Copper Content in Brass by… | RevisionDojo

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IB Chemistry HL Extended Essay Example

To what extent can various analytical methods, such as Spectrophotometry, Gravimetry, and Iodometric Titration, accurately measure copper content in brass alloys, and what are the implications of their respective strengths and limitations on the accuracy and precision of the obtained results?HL

Official IB Result

IB Grade: C

Criteria A: Focus and Method

5/6

Criteria Strands

A.1Topic communication and explanation

Excellent

A.2Research question formulation and focus

Excellent

A.3Research methodology

Excellent

Criteria Feedback

Topic is communicated accurately with clear purpose and industrial relevance
Research question is well-focused and consistently connected to discussion
Methodology is comprehensive with appropriate range of relevant methods and justified choices

Occasional informal or anecdotal phrasing reduces academic precision
Some verbose or wordy sentences slightly weaken concision

Criteria B: Knowledge and Understanding

3/6

Criteria Strands

B.1Application of source material

Moderate

B.2Subject knowledge

Moderate

B.3Use of terminology and concepts

Moderate

Criteria Feedback

Clear conceptual explanations of Beer–Lambert law, amphoteric behavior of Zn(OH)₂, and redox stoichiometry
Generally appropriate application of source material in the introduction and safety sections
Mostly accurate use of subject‐specific terminology throughout

Limited integration of primary literature into data interpretation and evaluation
Calculation blocks contain unit errors and inconsistencies
Reliance on secondary sources (e.g., Wikipedia) without critical evaluation

Criteria C: Critical Thinking

4/12

Criteria Strands

C.1Research quality

Moderate

C.2Analysis depth

Poor

C.3Discussion and evaluation

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.

Criteria D: Presentation

3/4

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.

Loading scores...

Official IB Result

IB Grade: C

Criteria A: Focus and Method

5/6

Criteria Strands

A.1Topic communication and explanation

Excellent

A.2Research question formulation and focus

Excellent

A.3Research methodology

Excellent

Criteria Feedback

Topic is communicated accurately with clear purpose and industrial relevance
Research question is well-focused and consistently connected to discussion
Methodology is comprehensive with appropriate range of relevant methods and justified choices

Occasional informal or anecdotal phrasing reduces academic precision
Some verbose or wordy sentences slightly weaken concision

Criteria B: Knowledge and Understanding

3/6

Criteria Strands

B.1Application of source material

Moderate

B.2Subject knowledge

Moderate

B.3Use of terminology and concepts

Moderate

Criteria Feedback

Clear conceptual explanations of Beer–Lambert law, amphoteric behavior of Zn(OH)₂, and redox stoichiometry
Generally appropriate application of source material in the introduction and safety sections
Mostly accurate use of subject‐specific terminology throughout

Limited integration of primary literature into data interpretation and evaluation
Calculation blocks contain unit errors and inconsistencies
Reliance on secondary sources (e.g., Wikipedia) without critical evaluation

Criteria C: Critical Thinking

4/12

Criteria Strands

C.1Research quality

Moderate

C.2Analysis depth

Poor

C.3Discussion and evaluation

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.

Criteria D: Presentation

3/4

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.