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CHM1011 - Chemistry I - S1 2025
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Which of the following has the largest dipole moment?
Conclusion
You should finish your report with a short statement commenting on what was achieved, and what the final numerical result/s were. Think of it as a spoiler for your whole lab report! Your conclusion should answer all parts of your aim.
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.)
- How do the concentrations of the reagents affect the reaction rate?
- How does the temperature affect the reaction rate?
- Compare the time taken for the reaction in the lab video (which was 154 s) to the times listed in the Results table for the first three experiments. Are there any differences? If so, why might that be?
- 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 on 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. |
Word limit: 300 (± 10%) words.
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 Questions
Below are the reactions performed: H2O2(aq) + 2I-(aq) + 2H3O+(aq) → I2(aq) + 4H2O(l) (1) I2(aq) + 2S2O32-(aq) → S4O62-(aq) + 2I-(aq) (2) I2(aq) + I-(aq) + Starch(aq) → (I3- -Starch)complex (aq) (3) |
During your practical today you determined the rate law for Reaction (1). What is the purpose of reactions (2) and (3)? With respect to hypothetical scenarios #1 and #2, discuss what you would observe at the macro and sub-micro level.
Scenario #1: No thiosulfate (S2O32-) is added to the flask
Scenario #2: Neither thiosulfate nor starch is added to the flask
This question provides you with some experimental data for the experiment and asks you to plot these results in Excel to identify the rate order for one reagent (as you did in the lab).
Using the data in the table provided and the steps below, calculate the rate order with respect to starch.
| [Starch] (%) | Reaction time (s) |
| 0.050 | 145 |
| 0.10 | 147 |
| 0.15 | 145 |
To calculate reaction rate:
1. Calculate the number of moles of S2O32- and subsequently the number of moles of I2 that reacted. Use the information in the lab manual for the initial experiment for these calculations.
2. Calculate reaction rate in mol/s with respect to I2.
3. Plot the concentration of starch (keep the concentration in %) on the x-axis and the reaction rate on the y-axis.
From there the rate order with respect to starch can be determined.
Questions
Consider the reaction:
2A + 3B + C → D
Rate versus concentration plots were obtained as follows:
The rate law for this reaction takes the form:
Rate = k[A]x[B]y[C]z
What are the values of x, y, and z?
Results
Use your own data for graphs.
Upload a single PDF of your graphs here.
Graphs:
- Reaction Rate vs [H3O+]
- Reaction Rate vs [H2O2]
- Reaction Rate vs [I-]
- Reaction Rate vs [S2O32-]
Marking Rubric per graph plotted in Excel (or equivalent) (0.4 marks each, 2 marks total/graph):
- Title
- Labelled axis (including units)
- Scale of graph (appropriate and even)
- Minimum of 3 data points recorded per graph
- Line of best fit