Consider before watching the videos:

What happens when we heat a material?

Lab Experiments (Write protocols based on the videos then complete your protocols as you perform experiments in class):

1. Decomposition of Baking Soda

Lab Technique videos (Use these if you need help with your measurements)

1. Weighing

 

Data analysis and calculations (Use these if you need help with your data and calculations)

1. Stoichiometry
2. Percent Yield
3. Interpreting Chemical Equations

The pre-labs will be due before your lab class meets and will include Experimental Protocol, Chemical Table and Equipment Table.

(Analysis) Watch the experiment videos. Take notes on the protocols. Stop the videos and re-watch as necessary to acquire 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 follow, so be detailed.

(Analysis) Identify the equipment (type AND size) needed for the experiment and include the name and an image (picture) of each.  Be sure to describe the equipment, how to use it, and why it is suitable for this use.

Equipment Name	Equipment Picture or Description	Intended Purpose

 

(Acquiring competencies) Following your detailed protocol, 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.

1. (Representation) Write a balanced chemical equation for the decomposition of baking soda, indicating the states of all the chemicals involved.
2. (Analysis) Classify the chemical reaction and provide evidence for your choice.
3. (Interpretation) Using your balanced equation that describes the observed reaction, interpret its meaning on the microscopic and macroscopic scale.
4. (Manipulation) Calculate the theoretical yield for the reaction in grams of sodium carbonate.
5. (Manipulation) Calculate the % yield of the reaction. Show all the steps and units.
6. (Manipulation) Estimate the percent composition of your collected product.
7. (Experimental Design) Propose a method for testing your sodium carbonate at the end of the experiment to confirm it did not react with the water and CO₂ from the air.
8. (Analysis) Identify at least one of the 12 principles of green chemistry applied in this experiment. Justify your selection. 12 Principles of Green Chemistry
9. (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 CO2 and H2O 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 CO2 available

 

Summary

The summary has two parts: an abstract and an experimental protocol reflecting the experiment that you actually performed. The abstract and experimental protocol should both be between 100-250 words, size 12 Arial font each. There may be multiple experimental protocols for one experiment.

Part 1.

Title of Experiment: Performed tasks and applied techniques to accomplish the goal of the experiment and a description of the system under study (the title you are given for the lab is insufficient). Ex. Thermal Decomposition of Sodium Bicarbonate

(This is a highlight of what you learned from performing the experiment and processing your collected data. Below is a template and an example of what you are expected to write.) In this lab experiment we investigated [purpose of your experiment] using [list the materials you worked with] and we found that [present the highlights of your results (include numbers)]. The results [present significant results]. The collected data compares to [draw conclusion about your results compared to other sources (this could be another group or the literature value)]. The [add type of measurement individually] measurement was collected using [describe instrument by sensitivity].   Think through this before writing:

1. Purpose: What were you trying to do?
2. Materials used: What chemicals and materials did you work with?
3. Method: What instruments were used to collect measurements and how were the measurements collected?
4. Results: What did you find out about the objects under study?
5. Significance: What did you learn about the precision and accuracy of your techniques? How do your determined values compare to reported values?

  Ex. In this lab experiment we investigated the thermal decomposition of … to …. The mass of the starting material was determined to be …. g and we estimated the final mass on to be…g. The yield of the reaction was …%. All mass measurements were collected on digital scales with 0.01 g sensitivity.  

Part 2.

Title of Protocol (Brief description of the experiment in bold)

Ex. Converting baking soda to sodium carbonate  

Experimental Protocol

(This is a condensed and organized description of the protocol you actually completed during class. Use the exact amounts of materials and list the exact equipment that you used in performing the experiment. The length of this section depends on the complexity of your experiment, usually 3-4 sentences maximum in one paragraph.)   Ex. We measured …grams (…mole) of baking soda using a digital scale with a sensitivity of 0.01 g into a …mL beaker and heated it on a hot plate set to … for … minutes and obtained (description) product that weighed …grams. (For each material and procedure)