Exp 8 - Decomposition
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Apr 3, 2024
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Decomposition
VIDEO LINKS:
Lab Experiments (Write protocols and perform experiments based on these):
1.
Decomposition of Baking Soda
Data analysis and calculations (Use these if you need help with your data and interpretations)
1.
Stoichiometry
2.
Percent yield
3.
Interpreting Chemical Equations
The prelab must include Experimental Protocol, Chemical Table and Equipment Table.
The lab report requires all sections (including prelab sections) to be completed in one document.
Experimental Protocol
(Analysis) Watch the experiment videos. Take notes on the protocol. Stop the video and re-watch as
necessary to acquire the details of the procedure. Write out the protocol for each part of the experiment. (It can be written in sequential steps. Complete sentences are not necessary.) This is the protocol you will follow, so be detailed. Chemical Table
(Representation) Prepare your chemical table including the materials you will use in the experiment. Here is a general template that you may use.
Chemical
Name
Chemical
Formula
Molar Mass (g/mol)
Hazards
reference
PPE
Sodium Chloride
NaCl
58.5
Skin irritation
https://fscimage.fishersci.com/msds/21105.htm
Decomposition is shared under a CC BY-NC-SA 4.0
license and was authored, and/or curated by Dr. Eszter Trufan
and Dr.
Elene Bouhoutsos-Brown
to the style and standards of the Experimentium platform.
CC BY-NC-SA 4.0
2
Equipment Table
(Analysis) Identify the equipment (type AND size) needed for the experiment and include the name and an image of each. Be sure to describe the equipment, how to use it, and why it is suitable for this
use.
Equipment Name
Equipment Picture
Intended Purpose
Data Collection
(Acquiring competencies) Following your detailed protocol based on the videos, perform all the experiments. Record your observations and take pictures of your key steps in the process. Your observations and images need to be incorporated in your data section and this section should be as detailed as possible as you will use this information to complete your discussion.
CC BY-NC-SA 4.0
3
Data Processing
1.
(Manipulation) Calculate the percent yield of the reaction. Show your calculations with the appropriate units.
2.
(Manipulation) Collect the percent yield values from your group members and calculate the average percent yield for your group. 3.
(Assumptions and Analysis) Fill in the following table using the observations and data from your experiments.
Assumptions made
Testing the assumption
If assumptions are wrong ...
Only CO
2
and H
2
O are
released in the reaction.
Funnel the gases in indicator solution.
The sodium carbonate
does not change back to sodium bicarbonate even if there is water and CO
2
available.
Your preview ends here
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CC BY-NC-SA 4.0
4
Discussion
Write a minimum one-page (12 font, single spaced) discussion on the experiment conducted this
week. Address at least one question in each category
as fully as possible integrating the collected
data, providing explanations for the observed trends, and evaluating whether your original
assumptions about the experiment were validated by the results. The assignment will be graded on
completeness, clarity of the explanations and the meaningful integration of the collected and
calculated data.
Correct grammar and appropriate format for the chemical formulae and chemical
reactions is expected. You may use the outline included at the end of this document on how to
build your essay to address each category.
1.
(Representation) Write a balanced chemical equation for the performed reaction indicating the states of all involved chemicals.
2.
(Interpretation) Using your balanced chemical equation that describes the observed reaction, interpret its meaning on the microscopic and macroscopic scale.
3.
(Existing knowledge, research, and views) Classify the chemical reaction and provide evidence to support your choice(s).
4.
(Manipulation) Describe how percent yield is calculated and use your calculations to demonstrate the steps involved.
5.
(Assumptions and Limitations) Describe at least one assumption you make when calculating the theoretical yield. Identify at least two reasons from your experiment that make it impossible
for the actual yield and theoretical yield to be identical.
6.
(Acquiring competencies) Describe how you made your solution and comment on its concentration.
7.
(Experimental design) Propose a method for testing your sodium carbonate at the end of the experiment to confirm that it didn’t react with the water and the CO
2
from the air.
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