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After thinking about it a bit, there were at least five distinct features that convinced me to pursue this lab. Let students know that although the reaction in this lesson looks more complicated, these same principles still apply. Decomposition of sodium bicarbonate stoichiometry lab answer key. Pass the test tube through the flame until all of the water has evaporated. With a marker pen, label each test tube near the top 1, 2, and 3, respectively. Add ½ teaspoon of baking soda to the empty graduated cylinder. 41 grams of sodium bicarbonate, and 0. Follow the simple instructions below: The days of terrifying complicated legal and tax documents are over. Place 50 mL of water in a 100 mL graduated cylinder. 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. Repeat steps 7 and 8 with test tubes 2 and 3. Atoms are not created or destroyed in a chemical reaction.
40 g of sodium bicarbonate is added. 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. How to fill out and sign baking soda stoichiometry lab online? As a demonstration, combine vinegar and baking soda to show students the chemical reaction described in the equation. In this demonstration, students will observe that the vapor of an extinguished candle flame is ignitable.
While they might be lacking in these areas, they are not completely clueless. Why, on the molecular level, does changing the amount of baking soda or vinegar affect the amount of carbon dioxide gas produced? Have students look at the chemical equation for the vinegar and baking soda reaction as you discuss the reactants. They can graphically analyze this discrepant event by plotting the change in pressure vs. the mass of sodium bicarbonate and viewing all 5 of the data runs. Add 1 drop of detergent solution and swirl gently to mix. 1 clear plastic cup. Student Whiteboards. Vinegar and baking soda stoichiometry lab. Use mathematical representations of phenomena to support claims.
Turn on the Wizard mode on the top toolbar to get extra pieces of advice. Record the mass (test tube + NaCl) on the report sheet data table. Hold the graduated cylinder over a waste container. Both reactions will produce gas and will be conducted in a Ziploc bag, causing it to inflate. Get, Create, Make and Sign lab 23 decomposition of baking soda stoichiometry answers. Repeat until no water vapor appears. Using a scoop or spatula, add small portions of NaHCO3 (sodium bicarbonate) to each test tube so that only the rounded bottom of the test tube is filled. They know just enough to successfully accomplish their task, even if they do not immediately start making connections to content already learned. They have made the connection that something will run out and stop the reaction! Though you will need to purchase the Argument-Driven Inquiry in Chemistry book to access the full teacher handout and notes, you can find a free student-version lab handout online. 40 g. How can this be? Which atoms make up a molecule of acetic acid (vinegar)?
Once the reaction is complete, it's time to analyze the data! Though I demonstrated some basic safety tips, how to set up their apparatus, and the general approach to performing the reaction, the bulk of the experimental design was going to be on them. Also, included in this Mega Unit Bundle are two quizzes, one set of task cards, color-by-number, three doodle notes, 2 graphic organizers, a board game, scavenger hunt, a stoichiometry lab, and a teacher demonstration with inquiry activity. 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. 4) Developing an argument from evidence. Controlling the Amount of Products in a Chemical Reaction.
All masses should be reported to TWO decimal places (e. g. 7. Can you add the baking soda first and then the vinegar on one trial and then switch it for the other trials? To the students, this reactant is a complete curveball. Filter by: 26 – 38 of 38 Classroom Resources. 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. A chemical reaction occurred because a different substance was produced when the reactants combined. Note: It is not necessary for students at the middle school level to know which particular atom in the reactants ended up in which product. In fact, the agreement with that hypothesis is quite strong, and the agreement with the supposedly correct hypothesis is terrible. 3) Application of qualitative evidence. They could not rely on prior knowledge alone simply because they lacked sufficient prior knowledge that would allow them to know what the products should be without even performing the investigation. The mass of NaHCO3 in each test tube should be ~ 0.
Simple computational simulations are created and used based on mathematical models of basic assumptions. Could you just keep adding more and more baking soda to the same amount of vinegar to get more carbon dioxide? Add more vinegar and more baking soda. The Explain It with Atoms & Molecules and Take It Further sections of the activity sheet will either be completed as a class, in groups, or individually, depending on your instructions. Continue adding HCl slowly until all of the solid has dissolved. Make sure each test tube is clean and dry before you put it away. Get access to thousands of forms.
Chemical Change, Observations, Inferences, Chemical Change, Interdisciplinary | Elementary School. After accounting for our mistakes, if we are still surprised by the results, maybe there is something new to learn about the nature of reality! 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. This method mixes the baking soda and vinegar well. And finally, an editable unit study guide and editable unit test a. Maybe you read the scale wrong. Click on the Get Form option to begin modifying.
Questions that challenge the premise(s) of an argument, the interpretation of a data set, or the suitability of a design. Keywords relevant to Lab 23 Decomposition Of Baking Soda Stoichiometry Answers. This made for good conversation regarding experimental error. Explain to students that another way of saying that no atoms are created or destroyed in a chemical reaction is that mass is conserved. 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. Do a demonstration using Alka-Seltzer or a similar effervescent tablet in water to show that citric acid reacts with sodium bicarbonate to produce carbon dioxide gas. Students will investigate available materials, quantities and ratios during allotted planning and testing phases. Stoichiometry and Chemical Reactions: Which Balanced Chemical Equation Best Represents the Thermal Decomposition of Sodium Bicarbonate? Should you rinse the graduated cylinder each time? Analyzing data in 9–12 builds on K–8 and progresses to introducing more detailed statistical analysis, the comparison of data sets for consistency, and the use of models to generate and analyze data. Do you think this is a chemical reaction? Point out that the type and number of atoms in the reactants and in the products are exactly the same.
Students will analyze the chemical equation for the reaction between vinegar (acetic acid solution) and baking soda (sodium bicarbonate). There are a number of tools and methods teachers employ to get students through this tough topic, including flow charts, algorithms, the Before Change After (BCA) approach, and physical models to reach students. What atoms is sodium bicarbonate made of?
How many of each type of atom are there in the compound sodium bicarbonate? To explain this, they need to dig deeper into the data and convert masses of reactants into moles. But I think it would be much more honest to report your result as it actually happened.
Use vinegar in a well-ventilated room. While the method used for groups to communicate their argument to others can easily vary from teacher to teacher, I decided to have 2-3 groups come together and present their findings to each other. Any products or leftover reactants that remain in the graduated cylinder may affect the next reaction. With US Legal Forms the whole process of submitting official documents is anxiety-free.