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41 grams of sodium bicarbonate, and 0. How will you remember the amounts you used in each trial? Select Done in the top right corne to save the file. Keywords relevant to stoichiometry lab answers key form. Do not point it at anyone or at yourself. Please consider taking a moment to share your feedback with us. This rise is caused by the evolution of gas during the baking process. Students will record their observations and answer questions about the activity on the activity sheet. After you have completed the experiment, rinse each test tube with tap water and pour the contents down the drain. You can use three options; typing, drawing, or capturing one. Heat your sample again for a few minutes. In this experiment from our Essential Chemistry Laboratory Investigations Manual, students perform multiple trials, keeping the amount of baking soda (sodium bicarbonate, NaHCO3) constant while increasing the amount of citric acid (C6H8O7). Get, Create, Make and Sign lab 23 decomposition of baking soda stoichiometry answers. Drop half of an Alka-Seltzer tablet in the graduated cylinder.

Baking Soda In Chemistry

After connecting the Wireless Pressure Sensor to SPARKvue and opening lab 8D in the Essential Chemistry folder, students can start data collection. Record the mass (test tube + NaCl) on the report sheet data table. Each group was given approximately 20 minutes to come up with an outline for their experimental design. 2) Application of stoichiometry. Continue to move the entire test tube slowly through the flame until only a white solid remains. Some students will realize that the later trials did not produce proportionally higher changes in pressure because there was not enough sodium bicarbonate to react with all of the citric acid. 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. Place about ½ teaspoon of baking soda in a clear plastic cup. Explain to students that another way of saying that no atoms are created or destroyed in a chemical reaction is that mass is conserved. We had just finished our reactions unit, so they were all familiar with the generalized pattern that a decomposition reaction follows. Maybe your starting sodium bicarbonate contained water (so it wasn't 100% pure) and that water was driven off in the heating.

There are one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms in every unit of sodium bicarbonate. 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. Using the molar masses of NaHCO3 and C6H8O7, they can calculate that there are 0. 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. Help students count the atoms in the reactants and in the products of the vinegar-baking soda reaction.

Analysis Of Baking Soda Lab Answers

Add more vinegar and more baking soda. Be sure you and the students wear properly fitting goggles. They can be inspired by a model's or theory's predictions or by attempts to extend or refine a model or theory (e. g., How does the particle model of matter explain the incompressibility of liquids? With respect to materials, I gave them the following list of equipment and the chemical they were going to consume. 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. There's the reason for the 3:1 ratio of moles of sodium bicarbonate and citric acid!

In this demonstration, the teacher will perform two chemical reactions, one will be between acetic acid (vinegar) and sodium bicarbonate (baking soda) and the other will be between Alka-Seltzer and water. Mathematical and computational thinking at the 9–12 level builds on K–8 and progresses to using algebraic thinking and analysis, a range of linear and nonlinear functions including trigonometric functions, exponentials and logarithms, and computational tools for statistical analysis to analyze, represent, and model data. Students will be able to explain that for a chemical reaction to take place, the bonds between atoms in the reactants are broken, the atoms rearrange, and new bonds between the atoms are formed to make the products. While students watch, pour the vinegar into the baking soda. Student Whiteboards. Equipment: Bunsen burner, lighter, test tube, glass stir rod, tongs, electronic balance, periodic table. Even though this feature is a hallmark trait of every ADI-themed lab, it was still a relatively new experience for me. Do you think a chemical reaction occurred?

Stoichiometry Lab Answer Key

Fill another clean and dry test tube with NaHCO3 and begin again. Baking soda is used to prepare cakes in order to insure that cakes "rise" as they bake. Your data supports the hypothesis that the sodium bicarbonate decomposed to sodium oxide.

Let students know that this principle has limits. Make a detergent solution by adding 1 teaspoon of liquid dish detergent to 2 tablespoons of water. As chemistry teachers, the depth of our content knowledge allows us to systematically rule out three of the reactions without even performing the experiment. Atomic weights are found below the element symbol on the periodic table.

Baking Soda Stoichiometry Lab Answer Key Figures

In addition, you will calculate the theoretical amount (also called the theoretical yield) of NaCl that can be produced and compare the two by calculating a percent yield. Modeling in 9–12 builds on K–8 and progresses to using, synthesizing, and developing models to predict and show relationships among variables between systems and their components in the natural and designed worlds. Should you rinse the graduated cylinder each time? Always hold the test tube at an angle. Atoms from the reactants rearrange to form the products. Students need to experience the fact that science is not just a linear process driven by knowing exactly what to do and exactly what to expect every step of the way without hiccups. Note: If any of the liquid splashes out during heating, stop and discard the contents of that test tube. NaHCO3 that reacts, one NaCl is produced. Or they can result from the need to provide better solutions to a problem.

Students will be able to count the number of atoms on the reactant side and on the product side of a chemical equation. Make sure one student in the group is firmly holding the stopper in place while swirling the bottle during data collection. These are the number of that particular atom in the acetic acid molecule. 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. The students are provided with four different balanced chemical equations that could explain how the atoms are rearranged during this decomposition. Students will analyze the outcome and compare the presence of the gases in the container and make determinations about the densities of each.

What else is produced in this chemical reaction? What they did not consider was that the contents of their test tube were going to still be really hot. Everything you need for a successful Stoichiometry Unit! 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. Bubbles will form and rise up in the cup. Chemical Change, Phase Changes, Combustion, Observations | Elementary School, Middle School. Planning and carrying out investigations in 9-12 builds on K-8 experiences and progresses to include investigations that provide evidence for and test conceptual, mathematical, physical, and empirical models. Student will record their plans, modifications and designs during the process. 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. Hearing them use their knowledge of stoichiometry to justify why their results made sense or pointing out the faulty reasoning in another group's results was something I wish I had recorded. Use mathematical representations of phenomena to support claims. They will make the connection between the written chemical equation, the molecular model, and the real substances in the reaction. The activity sheet will serve as the "Evaluate" component of each 5-E lesson plan.

Set the test tube aside until you are ready to heat it. Students should realize the necessity of making and recording accurate measurements in the chart provided. Because a gas was produced. What are the constraints? Analyze data using tools, technologies, and/or models (e. g., computational, mathematical) in order to make valid and reliable scientific claims or determine an optimal design solution. Pour the vinegar and detergent from the cup into the graduated cylinder. Holding the test tube by the clamp, move the test tube slowly back and forth through the flame. Students will also determine that these are both endothermic reactions based on their observations. 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. We even use analogies of bikes, cookies or hamburgers to make limiting reactants relatable.

It might seem strange, but sometimes a product can be made up of atoms from only one reactant. Attach a test tube clamp near the top of the first test tube. Guide students as you answer the following questions together: - Is every type of atom on the left side of the equation also on the right side of the equation? Divide this detergent solution equally into one small cup for each group. Students will observe the reaction, and identify indicators of chemical change as well as discuss the different types of matter that are involved. As you near the end, the solution will start to look cloudy and you will see drops of water high up on the inside of the test tube. Based on the graphs, the third trial is closest to an ideal ratio of reactants. How many of each type of atom are there in the compound sodium bicarbonate? Fill in every fillable field. And finally, an editable unit study guide and editable unit test a.