CHM1011 - Chemistry I - S1 2025
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Which of the following molecules would you expect to have the shortest bond length for the oxygen-oxygen bond?
Which of the following molecules would you expect to have the largest oxygen-oxygen bond energy?
Which of the following diatomic molecules would you expect to have the largest bond length?
Conclusion
Your conclusion should answer all parts of your aim, and should state the (numerical) results. Think of it as a spoiler for the whole lab report!
For example:
If the aim is: Determine the concentration of Vitamin C in a fruit juice via a redox titration against N-bromosuccinimide.
The conclusion might be: Berri orange juice (2000 μL aliquots, in triplicate) was titrated against a 0.104 M solution of N-bromosuccinimide. The concentration of Vitamin C in the fruit juice was determined to be 55.0 mg/L.
Discussion
This is where you discuss and give meaning to the results. You should also detail any experimental errors and make any other relevant comments about the experiment. Include possible improvements. Ensure you are not re-stating the method.
Discussion points to consider: (Note: The points below are not intended as questions! They are here to give guidance on what to include in your discussion. Do not simply list answers - incorporate them into a full discussion.)
- Relate results back to the aim and introduction of the experiment – what was trying to be done, did the results support the aim of the experiment?
- Comment on the %w/v of acetic acid in the dressing. How confident are you with the results? Were reasonable values obtained?
- What do the colour changes represent? How does this affect indicator choices in this experiment? Why did the indicators change between the two titrations?
- What factors may have affected the final results? What are some sources of error that may have been encountered, and how would they have impacted the results?
Discussion marking rubric:
| 0 | 1 | 2 |
Relates results to aims. | Interpretation of results not related back to original experimental aims. | Results partially related back to original experimental aims. | Key results interpreted in relation to experimental aims. |
Discussion and interpretation of results. | No interpretation or comparison of results is made. No discussion points are addressed. | Some interpretation or comparison of results is made. Some discussion points are addressed. | Key findings are summarised. Results are interpreted. Results are compared to expected/predicted values. All discussion points are addressed. |
Actual data used to validate statements. | No experimental data used to justify scientific statements/claims. Multiple scientific errors are present. | Some experimental data used to justify scientific statements/claims. Some scientific errors are present. | Experimental data used to justify all scientific statements/claims. The science is correct. |
Factors affecting results discussed. | No errors were raised or were only non-scientific/experimental errors raised. | Only some errors raised or several non-scientific/experimental errors were raised. The impact of the errors was not discussed. | Multiple errors/factors are raised and are scientific/experimental in nature (i.e. NOT human error). The impact of the errors was discussed. |
Writing Style | Many grammatical/spelling/scientific writing errors were noted, and/or discussion was over 300 words in length. | Some grammatical/spelling/scientific writing errors were noted. | The discussion was free of grammatical and spelling errors, was written in the past tense, used full sentences and a passive voice, and was within 300 words. |
Maximum of 300 words (+/- 10 %).
For guidance on writing a meaningful discussion, please refer to the following resources:
- SoC: Undergraduate Student Handbook
- RLO: Writing a Science Lab Report
- RLO: Writing for Assignments
Chemistry Drawing Question.
Equal volumes of solutions of sodium hydroxide (NaOH) and sodium chloride (NaCl) are mixed. The initial concentrations of the solutions are identical.
What is the final concentration of sodium ions?
Q2. A student calculated a weight percentage of acetic acid in the dressing of 2.3 %w/v. Considering that commercial salad dressings range from 4-8 %w/v, this value is slightly low and an error has likely occurred.
Assign the following sources of error into the three categories (i.e. in the table, enter in the category number, without the full stop):
- An experimental/scientific source of error. Difficult to avoid without significant experimental changes.
- Operator/human error. Likely to cause only minor deviations and can likely be corrected for with sufficient care and training.
- An insignificant source of error.
Parallax error (i.e. misreading the value from the burette). | |
Leaving an air bubble in the burette. | |
Inaccuracies in the autopipette (e.g. only measures to two decimal places). | |
Insufficiently cleaned glassware. | |
Perceiving the exact colour change at the end-point. |
Questions
Q1. Out of the following five titres, which three are considered concordant?
Note: Marks will be deducted for incorrect answers.
Skills Tests
Record the satisfactory completion of your skills tests here. Your TA will check this against their records.
Practical Skill | Satisfactory (as determined by your TA)? |
Correctly fill a burette | |
Accurately read a burette to 2 decimal places (as confirmed by your TA) | |
Use an auto-pipette correctly | |
Results
Determination of Error in Auto-Pipette
Aliquot Number: | Weight (g) | Volume(calculated) (μL) | |
1 |
|
| |
2 |
|
| |
3 |
|
| |
Mean | g | μL | ±Std Dev μL |
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