IB Chemistry Web

Experimental assessment criteria


Prescribed list of experiments

Topic 1. - The obtaining and use of experimental data for deriving empirical formulas from reactions involving mass changes.

Topic 1.3 - Use of the experimental method of titration to calculate the concentration of a solution by reference to a standard solution.

Topic 1.3 - Obtaining and the use of experimental values to calculate the molar mass of a gas from the ideal gas equation.

Topic 5.1 - A calorimetry experiment for an enthalpy of reaction should be covered and the results evaluated.

Topic 8.2 - Candidates should have experience of acid-base titrations with different indicators.

Topic 8.3 - Students should be familiar with the use of a pH meter and universal indicator.

Topic 9.2 - Performance of laboratory experiments involving a typical voltaic cell using two metal/metal-ion half-cells.

Topic 10.1 - Construction of 3D models (real or virtual) of organic molecules.

Topic 15.1 - Perform lab experiments which could include single replacement reactions in aqueous solutions. (either here or 19.1)

Topic 19.1 - Perform lab experiments which could include single replacement reactions in aqueous solutions.

Practical (Internal) Assessment 2016 exams

Personal engagement

This criterion assesses the extent to which the student engages with the exploration and makes it their own.
Personal engagement may be recognized in different attributes and skills. These could include addressing personal interests or showing evidence of independent thinking, creativity or initiative in the designing, implementation or presentation of the investigation.

Mark Descriptor
0 The student's report does not reach a standard described by the descriptors below.
1 The evidence of personal engagement with the exploration is limited with little independent thinking, initiative or creativity.
The justification given for choosing the research question and/or the topic under investigation does not demonstrate personal significance, interest or curiosity.
There is little evidence of personal input and initiative in the designing, implementation or presentation of the investigation.
2 The evidence of personal engagement with the exploration is clear with significant independent thinking, initiative or creativity.
The justification given for choosing the research question and/or the topic under investigation demonstrates personal significance, interest or curiosity.
There is evidence of personal input and initiative in the designing, implementation or presentation of the investigation.

Exploration

This criterion assesses the extent to which the student establishes the scientific context for the work, states a clear and focused research question and uses concepts and techniques appropriate to the Diploma Programme level. Where appropriate, this criterion also assesses awareness of safety, environmental, and ethical considerations.

Mark Descriptor
0 The student's report does not reach a standard described by the descriptors below.
1-2 The topic of the investigation is identified and a research question of some relevance is stated but it is not focused.
The background information provided for the investigation is superficial or of limited relevance and does not aid the understanding of the context of the investigation.
The methodology of the investigation is only appropriate to address the research question to a very limited extent since it takes into consideration few of the significant factors that may influence the relevance, reliability and sufficiency of the collected data.
The report shows evidence of limited awareness of the significant safety, ethical or environmental issues that are relevant to the methodology of the investigation.
3-4 The topic of the investigation is identified and a relevant but not fully focused research question is described.
The background information provided for the investigation is mainly appropriate and relevant and aids the understanding of the context of the investigation.
The methodology of the investigation is mainly appropriate to address the research question but has limitations since it takes into consideration only some of the significant factors that may influence the relevance, reliability and sufficiency of the collected data.
The report shows evidence of some awareness of the significant safety, ethical or environmental issues that are relevant to the methodology of the investigation.
5-6 The topic of the investigation is identified and a relevant and fully focused research question is clearly described.
The background information provided for the investigation is entirely appropriate and relevant and enhances the understanding of the context of the investigation.
The methodology of the investigation is highly appropriate to address the research question because it takes into consideration all, or nearly all, of the significant factors that may influence the relevance, reliability and sufficiency of the collected data.
The report shows evidence of full awareness of the significant safety, ethical or environmental issues that are relevant to the methodology of the investigation.
* This indicator should only be applied when appropriate to the investigation.

Analysis

This criterion assesses the extent to which the student's report provides evidence that the student has selected, recorded, processed and interpreted the data in ways that are relevant to the research question and can support a conclusion.

Mark Descriptor
0 The student's report does not reach a standard described by the descriptors below.
1-2 The report includes insufficient relevant raw data to support a valid conclusion to the research question.
Some basic data processing is carried out but is either too inaccurate or too insufficient to lead to a valid conclusion.
The report shows evidence of little consideration of the impact of measurement uncertainty on the analysis.
The processed data is incorrectly or insufficiently interpreted so that the conclusion is invalid or very incomplete.
3-4 The report includes relevant but incomplete quantitative and qualitative raw data that could support a simple or partially valid conclusion to the research question.
Appropriate and sufficient data processing is carried out that could lead to a broadly valid conclusion but there are significant inaccuracies and inconsistencies in the processing.
The report shows evidence of some consideration of the impact of measurement uncertainty on the analysis.
The processed data is interpreted so that a broadly valid but incomplete or limited conclusion to the research question can be deduced.
5-6 The report includes sufficient relevant quantitative and qualitative raw data that could support a detailed and valid conclusion to the research question.
Appropriate and sufficient data processing is carried out with the accuracy required to enable a conclusion to the research question to be drawn that is fully consistent with the experimental data.
The report shows evidence of full and appropriate consideration of the impact of measurement uncertainty on the analysis.
The processed data is correctly interpreted so that a completely valid and detailed conclusion to the research question can be deduced.

Evaluation

This criterion assesses the extent to which the student's report provides evidence of evaluation of the investigation and the results with regard to the research question and the accepted scientific context.

Mark Descriptor
0 The student's report does not reach a standard described by the descriptors below.
1-2 A conclusion is outlined which is not relevant to the research question or is not supported by the data presented.
The conclusion makes superficial comparison to the accepted scientific context.
Strengths and weaknesses of the investigation, such as limitations of the data and sources of error, are outlined but are restricted to an account of the practical or procedural issues faced.
The student has outlined very few realistic and relevant suggestions for the improvement and extension of the investigation.
3-4 A conclusion is described which is relevant to the research question and supported by the data presented.
A conclusion is described which makes some relevant comparison to the accepted scientific context.
Strengths and weaknesses of the investigation, such as limitations of the data and sources of error, are described and provide evidence of some awareness of the methodological issues involved in establishing the conclusion.
The student has described some realistic and relevant suggestions for the improvement and extension of the investigation.
5-6 A detailed conclusion is described and justified which is entirely relevant to the research question and fully supported by the data presented.
A conclusion is correctly described and justified through relevant comparison to the accepted scientific context.
Strengths and weaknesses of the investigation, such as limitations of the data and sources of error, are discussed and provide evidence of a clear understanding of the methodological issues involved in establishing the conclusion.
The student has discussed realistic and relevant suggestions for the improvement and extension of the investigation.

Communication

This criterion assesses whether the investigation is presented and reported in a way that supports effective
communication of the focus, process and outcomes.

Mark Descriptor
0 The student's report does not reach a standard described by the descriptors below.
1-2 The presentation of the investigation is unclear, making it difficult to understand the focus, process and outcomes.
The report is not well structured and is unclear: the necessary information on focus, process and outcomes is missing or is presented in an incoherent or disorganized way.
The understanding of the focus, process and outcomes of the investigation is obscured by the presence of inappropriate or irrelevant information.
There are many errors in the use of subject specific terminology and conventions.
3-4 The presentation of the investigation is clear. Any errors do not hamper understanding of the focus, process and outcomes.
The report is well structured and clear: the necessary information on focus, process and outcomes is present and presented in a coherent way.
The report is relevant and concise thereby facilitating a ready understanding of the focus, process and outcomes of the investigation.
The use of subject specific terminology and conventions is appropriate and correct. Any errors do not hamper understanding.
*For example, incorrect/missing labelling of graphs, tables, images; use of units, decimal places. For issues of referencing and citations refer to the "Academic honesty" section.

Criterion marks available
marks
Personal Engagement maximum 2 2 marks
Exploration maximum 6 6 marks
Analysis maximum 6 6 marks
Evaluation maximum 6 6 marks
Communication maximum 4 4 marks
 
Total =
24 marks