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Also, the baking soda should be added to the cylinder first. All masses should be reported to TWO decimal places (e. g. 7. Explain that the amount of detergent should not be varied in this activity because it is used as an indicator to help measure the amount of gas produced in the reaction. Ask students to make a prediction: - What will happen when an Alka-Seltzer tablet is placed in water with a drop of detergent solution? Students should realize the necessity of making and recording accurate measurements in the chart provided. However, since each reaction appears equally plausible from the perspective of the student, this meant the evidence gathered was the primary driver behind the construction of their argument. NSTA Press, 2015, pp. With respect to materials, I gave them the following list of equipment and the chemical they were going to consume. Chemical Change, Phase Changes, Combustion, Observations | Elementary School, Middle School. Baking soda stoichiometry lab answers. Whether you are looking to add a bit more scientific inquiry to your labs or simply looking for a great stoichiometry lab that can be added to your collection, I encourage you to try something like this with your students!
Repeat the procedure in step 5 with test tubes 2 and 3. I understand that the correct equation is supposed to be the first one where sodium carbonate was produced. Baking soda is used to prepare cakes in order to insure that cakes "rise" as they bake. How will you remember the amounts you used in each trial? Filter by: 26 – 38 of 38 Classroom Resources.
Chemical Change, Pressure, Reaction Rate, Acid Base Reactions, Chemical Change, Conservation of Matter | Elementary School, Middle School. The appearance of condensation in the dry test tube is a sign that there is still some water left in your sample test tube. Please consider taking a moment to share your feedback with us. At the same time, their lack of knowledge prevents them from confidently knowing the correct reaction prior to investigation. Decomposition of sodium bicarbonate stoichiometry lab answer key. In this lab, students will conduct a chemical reaction that will be used to launch a rocket. However, our students are novices. Though I had used a version of the decomposition of sodium bicarbonate lab in our stoichiometry unit for years, with consistent results, what the ADI book provided was a surprisingly different and more creative approach. Students will be able to count the number of atoms on the reactant side and on the product side of a chemical equation.
Discuss why adjusting the amount of reactants affects the amount of products. In a chemical reaction, only the atoms present in the reactants can end up in the products. Accredited Business. Conservation of Matter, Chemical Change, Photosynthesis, Balancing Equations, Reversible Reactions, Molecular Formula, Molecular Structure, Conservation of Mass, Interdisciplinary, Matter, Elements, Monomer | Elementary School. Click on the Get Form option to begin modifying. Can you add the baking soda first and then the vinegar on one trial and then switch it for the other trials? Repeat steps 7 and 8 with test tubes 2 and 3. Sometimes our experiments fail or produce results that do not make sense. Set up a Bunsen burner to evaporate all of the water from each test tube. Are you loving this? Density, Density, Chemical Change, Observations, Chemical Change, Combustion | Elementary School, Middle School. For example, they may ask: What is the need or desire that underlies the problem? The theoretical amount of NaCl that can be produced from a weighed amount of NaHCO3 and excess HCl is given by: The percent yield is given by: USE OF LABORATORY BALANCE. Maybe there is another reaction that also happens, perhaps involving the air, or the crucible, or the gas from the bunsen burner.
Add the amount of baking soda your group agreed on to the empty graduated cylinder. Pass the test tube through the flame until all of the water has evaporated. This really threw them off and I could sense the frustration from several groups because, for once, I was not spoon feeding them every single detail of each step in the procedure. Using less of one or more reactants will result in less of one or more products. If you ask the students to predict what will happen to the pressure most will (correctly) assume that the change in pressure will double since they have twice as much reactant. Should you rinse the graduated cylinder each time? I had mentioned that one of the characteristics I liked about this lab was the student involvement in experimental design. The students are provided with four different balanced chemical equations that could explain how the atoms are rearranged during this decomposition. Preview of sample stoich lab answer key. Look at the chemical equation. I was truly amazed by how many groups did not take the time to think about how they were going to collect their mass data. Make sure one student in the group is firmly holding the stopper in place while swirling the bottle during data collection. In this lab, students will have the opportunity to construct a rocket, with the challenges of both designing it and preparing a chemical reaction for its "fuel" in order to propel the rocket over the furthest distance. So, when they transferred their product to the container that was on the scale, their product literally melted right through the container!
A problem can involve writing chemical formulas, balancing equations, then multistep calculations converting amounts from grams to moles and back again. USLegal fulfills industry-leading security and compliance standards. You can use three options; typing, drawing, or capturing one. Some groups only recorded the mass of their sodium bicarbonate, without considering the mass of their test tube and glass stir rod.
It could be that this is due to an error you made... or maybe the stupid sodium bicarbonate didn't get the memo that, according to the teacher (or the text or Wikipedia or whatever), it was supposed to decompose to sodium carbonate, so it just went ahead and decomposed all the way to sodium oxide. Repeat until no water vapor appears. Students will see that the gas produced in the actual reaction is also written in the products of the equation. Hold the graduated cylinder over a waste container. For good results, these test tubes must be clean and completely dry before you start. The balanced chemical equation tells you that for every one. On top of all of this, we also ask our students to identify limiting reactants and determine percent yield for an experiment. Groups that did this immediately recognized the flaw in their experimental design and I honestly saw it as a wonderful learning opportunity. There are one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms in every unit of sodium bicarbonate. Students will also determine that these are both endothermic reactions based on their observations. In trials 4 and 5, there is not a proportional increase, indicating that some of the citric acid did not react. Give each Student an Activity Sheet.
Everything you need for a successful Stoichiometry Unit! Conservation of Matter, Pressure | Elementary School. During our stoichiometry unit, I wanted my students to take part in an engaging investigation. Continue adding HCl slowly until all of the solid has dissolved. Since we were nearing the end of our stoichiometry unit, this was a perfect application. Students will also change the amount of one or more reactants and see how the change affects the amount of products. After you have completed the experiment, rinse each test tube with tap water and pour the contents down the drain. Arguments may also come from current scientific or historical episodes in science.