Lab 1 Fun with Dimensional Analysis
You are to listen to the video, write down pertinent and useful information and provide a 2-3
page summary of the experiment discussed.
Your write-up should includea) introduction b) materials used c) procedure d) data presented e) discussion f)
conclusion.
Decomposition of Copper (II) Carbonate Experiment
You are to listen to the video, write down pertinent and useful information and provide a 2-3
page summary of the experiment discussed.
Your write-up should includea) introduction b) materials used c) procedure d) data presented e) discussion f)
conclusion.

SOLUTION

Lab 1: Fun with Dimensional Analysis

Decomposition of Copper (II) Carbonate Experiment

Introduction

Dimensional analysis is a fundamental mathematical tool used extensively in chemistry to convert between units, analyze quantitative relationships, and ensure accuracy in calculations. It allows chemists to track units through calculations and verify that results are logically consistent. In laboratory settings, dimensional analysis is essential for interpreting experimental data, determining reactant and product quantities, and converting measured values into meaningful chemical information.

The purpose of this laboratory experiment was to apply dimensional analysis concepts to a real chemical process: the thermal decomposition of copper (II) carbonate (CuCO₃). Through observation and measurement, this experiment demonstrated how mass relationships can be analyzed to understand chemical reactions. The decomposition reaction provided a practical example of how theoretical calculations align with experimental results, reinforcing the importance of dimensional analysis in experimental chemistry.

Materials Used

The following materials and equipment were used during the experiment:

Copper (II) carbonate (CuCO₃)
Heat source (Bunsen burner or hot plate)
Crucible with lid
Crucible tongs
Balance (analytical or digital)
Ring stand and clay triangle
Safety goggles
Lab apron or coat

These materials allowed for safe heating, accurate mass measurements, and controlled observation of the decomposition process.

Procedure

A clean, dry crucible and lid were weighed using a balance, and the mass was recorded.
A measured quantity of copper (II) carbonate was added to the crucible, and the combined mass was recorded.
The crucible was placed on a clay triangle supported by a ring stand.
The sample was heated gently at first, then more strongly, to initiate thermal decomposition.
During heating, the sample changed color, indicating a chemical reaction.
After heating, the crucible was allowed to cool completely.
The crucible, lid, and remaining solid were weighed again.
Mass differences were calculated using dimensional analysis to determine the mass of products formed and gases released.

All measurements were carefully recorded to ensure accuracy and consistency.

Data Presented

The data collected during the experiment included:

Initial mass of empty crucible and lid
Mass of crucible, lid, and copper (II) carbonate before heating
Final mass of crucible, lid, and product after heating
Mass difference before and after heating

Using dimensional analysis, the mass of carbon dioxide (CO₂) released during decomposition was calculated. The remaining solid was identified as copper (II) oxide (CuO), which appeared as a black powder after heating.

Discussion

The decomposition of copper (II) carbonate is represented by the following chemical equation:

CuCO₃ (s) → CuO (s) + CO₂ (g)

When heated, copper (II) carbonate decomposes into copper (II) oxide and carbon dioxide gas. The loss of mass observed during the experiment corresponds to the release of CO₂ into the atmosphere. Dimensional analysis was used to calculate the mass of CO₂ lost by subtracting the final mass from the initial mass.

The color change from green (CuCO₃) to black (CuO) provided visual confirmation that a chemical reaction occurred. Minor discrepancies between theoretical and experimental values may be attributed to experimental error, such as incomplete decomposition, heat loss, or inaccurate mass measurements.

This experiment highlighted the importance of dimensional analysis in chemistry. By carefully tracking units and mass changes, it was possible to connect experimental observations to chemical theory and stoichiometry.

Conclusion

In conclusion, this laboratory experiment successfully demonstrated the application of dimensional analysis through the thermal decomposition of copper (II) carbonate. By measuring mass changes and analyzing data, the formation of copper (II) oxide and the release of carbon dioxide were confirmed. The experiment reinforced key concepts related to unit conversion, mass conservation, and chemical reactions.

Dimensional analysis proved to be an essential tool for interpreting experimental data accurately. This lab provided a strong foundation for future chemistry experiments that require precise calculations and a clear understanding of quantitative relationships.