Chemistry Extended Essay Exemplar: Refrying Oils Iodine Value… | RevisionDojo

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IB Chemistry SL Extended Essay Example

What are the potential cardiovascular health implications of the change in iodine values ( 𝐼₂𝑔/100𝑔 𝑜𝑖𝑙) after refrying oils at 175°C for three one hour cycles asmeasured by titration in 15𝑐𝑚³ 𝑜𝑓 99. 5% cyclohexane with 0. 1 𝑚𝑜𝑙/𝐿Sodium thiosulphate (Na2S2O3) ?SL

Official IB Result

IB Grade: A

Criteria A: Focus and Method

5/6

Criteria Strands

A.1Topic communication and explanation

Excellent

A.2Research question formulation and focus

Good

A.3Research methodology

Excellent

Criteria Feedback

You communicate the investigation’s purpose clearly and keep the chemistry and biology framing visible throughout.
Your research question is clearly signposted and connected to the investigation’s practical focus.
You show thoughtful methodological planning by choosing a feasible approach and explaining why it suits the school-lab context.

The temperature variable is inconsistent in places, which weakens clarity and precision.
Some wording and repetition reduce the sharpness of the focus.
The variable-control table is not fully complete, which makes the method less polished.

Criteria B: Knowledge and Understanding

5/6

Criteria Strands

B.1Application of source material

Excellent

B.2Subject knowledge

Excellent

B.3Use of terminology and concepts

Excellent

Criteria Feedback

You demonstrate strong chemistry and biology knowledge, especially around unsaturation, lipid oxidation, and cardiovascular relevance.
You use subject-specific terminology confidently and in a mostly accurate way.
You apply source material in a purposeful way to support both the experimental chemistry and the broader biological context.

There are a few technical inaccuracies, such as describing ethanol as nonpolar.
Some numerical/uncertainty treatment is inconsistent, which weakens confidence in parts of the quantitative explanation.
A few claims would be stronger if they were stated with more caution, especially where the experiment cannot directly prove a specific product.

Criteria C: Critical Thinking

10/12

Criteria Strands

C.1Research quality

Good

C.2Analysis depth

Good

C.3Discussion and evaluation

Good

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

Criteria Strands

D.1Structure appropriateness

Excellent

D.2Layout considerations

Moderate

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: A

Criteria A: Focus and Method

5/6

Criteria Strands

A.1Topic communication and explanation

Excellent

A.2Research question formulation and focus

Good

A.3Research methodology

Excellent

Criteria Feedback

You communicate the investigation’s purpose clearly and keep the chemistry and biology framing visible throughout.
Your research question is clearly signposted and connected to the investigation’s practical focus.
You show thoughtful methodological planning by choosing a feasible approach and explaining why it suits the school-lab context.

The temperature variable is inconsistent in places, which weakens clarity and precision.
Some wording and repetition reduce the sharpness of the focus.
The variable-control table is not fully complete, which makes the method less polished.

Criteria B: Knowledge and Understanding

5/6

Criteria Strands

B.1Application of source material

Excellent

B.2Subject knowledge

Excellent

B.3Use of terminology and concepts

Excellent

Criteria Feedback

You demonstrate strong chemistry and biology knowledge, especially around unsaturation, lipid oxidation, and cardiovascular relevance.
You use subject-specific terminology confidently and in a mostly accurate way.
You apply source material in a purposeful way to support both the experimental chemistry and the broader biological context.

There are a few technical inaccuracies, such as describing ethanol as nonpolar.
Some numerical/uncertainty treatment is inconsistent, which weakens confidence in parts of the quantitative explanation.
A few claims would be stronger if they were stated with more caution, especially where the experiment cannot directly prove a specific product.

Criteria C: Critical Thinking

10/12

Criteria Strands

C.1Research quality

Good

C.2Analysis depth

Good

C.3Discussion and evaluation

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.

Criteria D: Presentation

3/4

Criteria Strands

D.1Structure appropriateness

Excellent

D.2Layout considerations

Moderate

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.