MEDLIN – IB CHEMISTRY SL
INTERNAL ASSESSMENT GRADING CRITERIA
STUDENT NAME: ________________________ LAB TITLE: ________________________________________________________
TOPIC: ________________________________
TIME: ____Hrs.
DATE: _______________________
INTERNAL ASSESSMENT GRADING CRITERIA
Aspect 1:
Defining the Problem & Selecting
Variables
Design
 Explicitly identified the relevant
variables:
 Independent
 Dependent
 Controlled
 Research Question (using variables) that
is specific and focused
 Literature Values (or statement of none)
 Cite (MLA) sources for Literature values
 Develop hypothesis based on Literature
values
 Brief explanation of the experiment
C
P
N
Aspect 1:
Recording Raw Data
Data
Collection
&
Processing
 Recorded raw quantitative data
 Recorded raw qualitative data
 Recorded given/relevant formulas or
values
 All tables contain titles, headings,
explanations
 Units are present and correct throughout
 Significant figures are correct within 1
value
 Every value contains appropriate
uncertainty
 Sig figs are consistent in uncertainties
 Tables are organized and easy to follow
C
Conclusion
&
Evaluation
P
N
Aspect 2:
Controlling Variables
 Explicitly describe how you will control the
control variables (or monitor them)
 Justify the need to control / effect on results
 Explain which variables cannot be controlled
and why
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C
P
N
 Table containing processed data
 Averages are taken of processed data
 Table containing final results, compares to
literature value
 Sample calculations are shown containing
equation, example, and explanation
 Units, sig. figs, and uncertainties are present
and correct
 Calculations are correct
P
N
Aspect 3:
Presenting Processed Data


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Table of processed data
Table contains title, headings, explanations
Units are present and correct
Sig figs are correct
Every value contains uncertainty (percent
or absolute)
Tables are organized and easy to follow
Graphs
 Original graph of raw data
 Correct choice of graph type
 Correct data was used to create graph
 Title, axes, key, units, variables graphed
correctly
 If linear, trend line and equation are present
 Overall presentation of graph is neat, legible,
well-executed
 Explanation of graph, and results of graph are
included
C
P
N
 Repeat results
 Show and explain % error
 Make references to graph, explaining
results
 Restate and respond to the research
question
 Literature values are referenced and
cited
 Describe the chemical concepts behind
the experiment, make relevant to IB
curriculum
 Justify your results or lack of
 Conclusion is based on your specific
results
 Uncertainty compared to percent error –
justify the difference
 Account for error type, explain
 Explain the difference between expected and
observed outcome
 Make comments about the reliability of
methods
 Can the results be trusted? Why/why not?
 Evaluate outliers
 List errors, problems, limitation s
 Account for error type
 Discuss accuracy vs. precision
 State the impact of each error on your results
 Explain weaknesses in detail, state how results
were affected
 Explain limitations in detail, state how results
were affected
N
Procedure is detailed, easy to repeat
Include a detailed apparatus diagram
Reference/cite any standard techniques
used in methods; cite sources if used for
procedure
Units, precision, size, formula of materials
Insure that sufficient data is collected and
appropriate # of trials selected, explain
reasoning
Sufficient range of independent variable
selected
Explanation of data collection leading to
data tables
C
Aspect 2:
Processing Raw Data
Aspect 2:
Evaluating Procedure(s)
P
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Aspect 1:
Concluding
C
Aspect 3:
Developing a Method for Collecting Data
C
P
N
C
P
N
Aspect 3:
Improving the Investigation
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State explicit, realistic improvements made
to methods, and how they minimize errors
Explain equipment changes and justify
Explain methods changes and justify
Suggestions to improve systematic errors if
possible
Suggestions to improve random errors
NOT FOR IB CRITERIA – BUT REQUIRED FOR
ME  Provide at least one relevant
extension for this lab: This can be simply
studying a different variable, testing the
effect of an error source, real world
examples, vocational applications, possible
extended essay topics, etc.
C
P
N