How does the electrolysis time (1 min, 2 min, 3 min, 4 min, 5 min) affect the amount of copper transferred onto a paper clip through electrolysis in a copper sulphate solution?SL
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5
Official IB Result
15/24
General feedback
15/24
0
12
24
No overall summary is available for this report.
5.1·Suggestion
Page 8
Risk assessment safety measures are clear; include mention of neutralization or disposal procedures for copper sulfate waste to complete the section.
5.2·Suggestion
Page 9
The ethical/environmental section mentions proper disposal but could reference specific waste protocols or regulatory guidelines.
Criteria A: Research Design
5/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Excellent
A.3Methodology description
Good
Criteria Feedback
- Clear, discipline-specific context for the research question linking electroplating to industrial applications
- Thorough explanation of methodological controls (repeats, solution concentration, voltage, electrode spacing, mass balance precision)
- Procedure and materials described well enough for reproducibility with only minor ambiguities
- Introduction left incomplete in places, omitting some variable definitions
- No explicit method for measuring or monitoring current during electrolysis
- Temperature control entry is split across tables and lacks a clear control method
- Ambiguity in how detached copper is recovered and massed (filter paper vs copper isolation)
1.1·Strength
Page 1
Strong contextual linkage between industrial electroplating and the electrolysis process provides a focused discipline-specific background.
1.2·Suggestion
Page 1
The research question clearly identifies the variables but could be refined to specify the form of copper measured (mass of copper deposited) for increased clarity.
1.3·Weakness
Page 1
The introduction ends mid-sentence, leaving out parameter definitions. Complete the paragraph to ensure full explanation of variables.
1.4·Suggestion
Page 2
Background on copper sulfate is descriptive, but adding the dissociation reaction in formal notation (e.g., ) would strengthen chemical accuracy.
1.5·Strength
Page 2
The rationale effectively ties the investigation to redox theory and practical applications, demonstrating relevance within the chemistry syllabus.
1.6·Suggestion
Page 3
The diagram is clear, but the text should explicitly reference “Diagram 1” when describing migration of ions for smoother integration.
1.7·Strength
Page 3
Correct representation of the cathode reduction half-reaction is presented and formatted clearly.
1.8·Weakness
Page 4
The sentence describing Faraday’s first law ends abruptly (“should also”). Complete this to articulate the proportional relationship fully.
1.9·Weakness
Page 5
Including filter paper mass in deposit calculations introduces ambiguity; specify whether copper mass is isolated or combined with filter paper.
1.10·Suggestion
Page 5
Procedure lists independent and dependent variables clearly; include a note on how current is measured or monitored to enhance reproducibility.
1.11·Weakness
Page 6
The temperature control entry in the controlled variables table is incomplete. Provide full explanation and control method for clarity.
1.12·Suggestion
Page 7
Materials list is thorough; noting instrument precision (e.g., voltmeter ±0.01 V, stopwatch ±0.1 s) would strengthen methodological transparency.
1.13·Suggestion
Page 8
Procedure step 2 describes wiring; explicitly state how polarity is verified and how current is monitored to avoid ambiguity.
Criteria B: Data Analysis
3/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Good
B.2Consideration of uncertainties
Moderate
B.3Data processing quality
Good
Criteria Feedback
- Data tables include units and uncertainties and a well-labelled scatter plot with best-fit line
- Use of Pearson’s r-value and error bars demonstrates sound statistical treatment
- Correct application of uncertainty propagation formula
- Inconsistent reporting of balance uncertainty (±0.001 g vs. ±0.0001 g) and significant figures
- Omissions in processing (missing entries for some time points) and incomplete uncertainty treatment for time and volume
- Outlier‐removal criteria not defined and combined uncertainties not carried through to regression
2.1·Weakness
Page 10
Raw data table contains inconsistent significant figures (e.g., 0.346 vs 1.024). Standardize to ensure precision and clarity.
2.2·Suggestion
Page 11
The choice to exclude the second trial is noted, but the criteria for outlier removal should be defined and justified.
2.3·Weakness
Page 11
Average mass table lists uncertainty as ±0.0001 g, conflicting with earlier ±0.001 g. Ensure consistency in uncertainty reporting.
2.4·Suggestion
Page 12
Sample calculation rounds the average too early. Retain full precision in intermediate steps before final rounding.
2.5·Weakness
Page 13
Processed data table omits entries for 4 and 5 minutes. Ensure completeness of data presentation.
2.6·Strength
Page 14
Graph is well-constructed with clear data points, best-fit line, and error bars illustrating standard deviation.
2.7·Strength
Page 14
Use of the Pearson’s correlation coefficient (r = 0.976) effectively quantifies the strength of the linear relationship.
2.8·Strength
Page 15
The propagation formula is applied correctly, demonstrating clear understanding of combined uncertainties.
2.9·Weakness
Page 15
Uncertainty discussion omits time and volume uncertainties which could influence the propagated error in mass measurements.
Criteria C: Conclusion
4/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and support
Excellent
C.2Scientific context comparison
Good
Criteria Feedback
- Conclusion directly references numerical results, r = 0.976, and relates findings to Faraday’s law
- Discussion of an anomalous data point and link to industrial relevance strengthens relevance
- No quantitative comparison with theoretical or literature values of copper mass
- Scientific-context comparison lacks numerical justification
3.1·Strength
Page 16
The conclusion effectively ties results to the hypothesis and Faraday’s law, aligning analysis with industrial relevance.
3.2·Suggestion
Page 16
Consider calculating the theoretical mass of copper expected via Faraday’s laws to compare with experimental values and deepen the conclusion.
Criteria D: Evaluation
3/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Suggested improvements
Good
Criteria Feedback
- Identification of specific methodological weaknesses (timing error, voltage fluctuation, heat build-up, electrode positioning, copper loss)
- Realistic improvements suggested (timer linkage, voltage regulator, jig, temperature bath)
- Lacks quantification of the relative impact of each weakness
- Explanations of how improvements would enhance data quality are brief and not fully developed
4.1·Strength
Page 17
Strength in controlling variables is well explained, demonstrating solid awareness of experimental design.
4.2·Suggestion
Page 18
Limitations table lists relevant weaknesses but lacks quantification of their relative impact on final results.
4.3·Suggestion
Page 19
Possible extensions are well-considered; linking proposed experiments to existing literature would strengthen the justification.