Make sure students see that every type of atom on the left side of the equation is also on the right. Pass the test tube through the flame until all of the water has evaporated. Baking soda stoichiometry lab answer key strokes. By letting them take ownership of their experimental design, a few things happened to some groups that served as a learning experience and opportunity for discussing the importance of experimental design within the scientific process. Baking soda stoichiometry lab answers. In this lesson, students will explore a simple, but key, biochemical reaction: photosynthesis.
Note: If any of the liquid splashes out during heating, stop and discard the contents of that test tube. Maybe you spilled some as you put it in the crucible. Groups that did this immediately recognized the flaw in their experimental design and I honestly saw it as a wonderful learning opportunity. Then stand test tube 1 up in a large beaker to cool for at least 5 minutes. Get, Create, Make and Sign lab 23 decomposition of baking soda stoichiometry answers. Classroom Resources | Reactions & Stoichiometry. 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. Sometimes it is hard to reduce, let alone eliminate, previous conceptions and biases when asking students to develop an argument from evidence. Do you think a chemical reaction occurred? Ask students about baking soda: - Sodium bicarbonate is baking soda.
In this demonstration, students will see that different food dyes react with bleach at different rates. Citric acid and vinegar are both acids and so interact with sodium bicarbonate in a similar way to produce carbon dioxide gas. The use of baking soda is especially popular in pancakes and waffles since th. Constructing explanations and designing solutions in 9–12 builds on K–8 experiences and progresses to explanations and designs that are supported by multiple and independent student-generated sources of evidence consistent with scientific ideas, principles, and theories. In this lab, students will explore simulated reactions that contribute to chemical weathering of certain rocks as it appears in nature. Point out that the type and number of atoms in the reactants and in the products are exactly the same. A simple experiment using household chemicals, a bottle (or flask) with a stopper and tubing, and a Wireless Pressure Sensor can give students the opportunity to easily change the amount of one reactant while quickly measuring the amount of product to see the limits of the limiting reactant. Usually vinegar is a solution of about 5% acetic acid and 95% water. Stoichiometry and Chemical Reactions: Which Balanced Chemical Equation Best Represents the Thermal Decomposition of Sodium Bicarbonate? Baking soda stoichiometry lab answer key tpt. When vinegar and baking soda react, atoms rearrange to form sodium acetate (the salty and sour flavor in salt-and-vinegar-flavored potato chips), water, and carbon dioxide. When this happens, we think about how we can improve the experiment and do it over again.
There are one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms in every unit of sodium bicarbonate. In this demonstration, students will observe that the vapor of an extinguished candle flame is ignitable. 1 g. The mass of NaHCO3 does not have to be the same in each test tube. You may choose to limit students to a maximum of three tries or let them experiment further if time and supplies allow. The activity sheet will serve as the "Evaluate" component of each 5-E lesson plan. Though some of the products can be easily determined qualitatively, stoichiometry will need to be applied when trying to identify the solid product that remains. They will compare the effects of two different chemicals as it contacts various rock and mineral samples. The important point for students to realize is that atoms from both reactants are necessary to produce the products. As a teacher, my favorite scenario was when different groups would have different conclusions and, consequently, different chemical reactions proposed. Next, it's time to repeat the experiment, but this time we'll use 0. Repeat the procedure in step 5 with test tubes 2 and 3. Just writing those sentences helps me understand why students struggle! Baking soda stoichiometry lab answer key image. I had mentioned that one of the characteristics I liked about this lab was the student involvement in experimental design. Place about ½ teaspoon of baking soda in a clear plastic cup.
Questions that challenge the premise(s) of an argument, the interpretation of a data set, or the suitability of a design. Consumable: Solid NaHCO3. Doing so resulted in a much higher product mass than they had predicted since there was still unreacted sodium bicarbonate in the test tube. Maybe you read the scale wrong.
Which atoms make up a molecule of acetic acid (vinegar)? Classroom Resources: Reactions & Stoichiometry. For good results, these test tubes must be clean and completely dry before you start. 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.
Also be sure that they see that there is an equal number of each type on both sides of the equation. All masses should be reported to TWO decimal places (e. g. 7. Detergent solution in a cup. There's the reason for the 3:1 ratio of moles of sodium bicarbonate and citric acid! Stoichiometry - During the decomposition of sodium bicarbonate lab, the mass of the final solid I received was less than expected. Errors. Using a plastic pipet, add 10% hydrochloric acid (HCl) solution slowly to test tube 1. Divide this detergent solution equally into one small cup for each group. 41 grams of sodium bicarbonate, and 0. Armed with these understandings, there will be no limit to their success! While I had previously shown them how to safely perform the reaction, I gave them no guidance on what data to collect or even how to collect it. The vinegar is poured in afterwards to cause better mixing of reactants. What atoms is sodium bicarbonate made of?
Continue adding HCl slowly until all of the solid has dissolved. This simple experiment with household chemicals gives student the experience and data to understand the limits of a limiting reactant, how the limiting reactant can change based on the amounts of substances, and why simply adding more of a reactant does not always lead to more product. Test it again for condensation with the dry inverted test tube. Heat your sample again for a few minutes. When an equation of a chemical reaction is written, it is "balanced" to show this. Students should realize the necessity of making and recording accurate measurements in the chart provided. This rise is caused by the evolution of gas during the baking process. Scientific questions arise in a variety of ways. Everyone knew they needed the mass before and after, but several groups never considered exactly how they were going to do this.
Swirl gently to mix. Even if we did need to do the investigation ourselves to determine the right equation, our experience in the lab and overall scientific literacy allows us to easily come up with a plan and identify exactly what we should be looking for. Density, Density, Chemical Change, Observations, Chemical Change, Combustion | Elementary School, Middle School. After you have completed the experiment, rinse each test tube with tap water and pour the contents down the drain. 10 grams of citric acid after they add 40mL of NaHCO3 solution to the reaction vessel. 2) Application of stoichiometry. Doing so resulted in the reaction seemingly taking forever to complete.
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