Using Evidence To Determine The Correct Chemical Equation: A Stoichiometry Investigation
Their task: Figure out which balanced chemical equation accurately represents the decomposition of sodium bicarbonate. To explain this, they need to dig deeper into the data and convert masses of reactants into moles. Get the free baking soda stoichiometry lab answer key form. Use professional pre-built templates to fill in and sign documents online faster. For example, they may ask: What is the need or desire that underlies the problem? Any decent teacher, though, would give you much more credit for correctly interpreting your data and coming to a conclusion based on the data, even if it's wrong, than for massaging your data to support a preconceived hypothesis. Please consider taking a moment to share your feedback with us. 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.
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- Stoichiometry lab answer key
Baking Soda Stoichiometry Lab
Carbon, hydrogen, and oxygen (C, H, and O). How will you remember the amounts you used in each trial? With US Legal Forms the whole process of submitting official documents is anxiety-free. 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. Be sure you and the students wear properly fitting goggles. 1 clear plastic cup. Heat your sample again for a few minutes. 3NaHCO3(aq) + C6H8O7(s) → Na3C6H55O7(aq) + 3H2O(l) + 3CO2(g). Ask students about baking soda: - Sodium bicarbonate is baking soda.
Decomposition Of Baking Soda Lab Answer Key
Do you think every acetic acid molecule has this formula? Using less baking soda, for instance, produces less carbon dioxide gas because there are fewer atoms from the baking soda to produce the carbon dioxide. Review the concept that mass is conserved in a chemical reaction. 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. Show students the chemical equation for the reaction between vinegar and baking soda. Continue adding HCl slowly until all of the solid has dissolved.
Baking Soda Stoichiometry Lab Answer Key Slides
All masses should be reported to TWO decimal places (e. g. 7. Have groups share their findings about the amounts of baking soda and vinegar that came closest to reaching the top of the cylinder. In this demonstration, students will observe that the vapor of an extinguished candle flame is ignitable. 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. So, when they transferred their product to the container that was on the scale, their product literally melted right through the container! Add the amount of baking soda your group agreed on to the empty graduated cylinder. 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. In the vinegar and baking soda reaction, the atoms in the CO2 only come from the sodium bicarbonate. A balanced chemical equation shows that no atoms are destroyed and no new atoms are created in the chemical reaction. Question to Investigate. Let students know that this principle has limits. However, through calculations using the ratio between reactant and solid product, my experiment showed that equation 2 where sodium oxide was produced is supposed to be correct.
Baking Soda Stoichiometry Lab Answer Key Quizlet
The use of stoichiometry to generate sufficient evidence that will support their eventual conclusion will be the meat of their argument. As chemistry teachers, the depth of our content knowledge allows us to systematically rule out three of the reactions without even performing the experiment. How many of each type of atom are there in the compound sodium bicarbonate? Students saw that the same type and number of atoms were in the reactants as were in the products. As a demonstration, combine vinegar, detergent, and baking soda in a graduated cylinder so that foam rises and spills over the top. Citric acid and vinegar are both acids and so interact with sodium bicarbonate in a similar way to produce carbon dioxide gas. 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. As a demonstration, combine vinegar and baking soda to show students the chemical reaction described in the equation. You may choose to limit students to a maximum of three tries or let them experiment further if time and supplies allow. 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).
Baking Soda Stoichiometry Lab Answer Key Images
When a drop of HCl produces no additional CO2 bubbles, the reaction is complete and no more HCl should be added. Add the date to the record with the Date tool. To keep the procedure simple, dissolve sodium bicarbonate in water to make a 0. 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. Arguments may also come from current scientific or historical episodes in science. Chemical Change, Observations, Inferences, Chemical Change, Interdisciplinary | Elementary School. Do not point it at anyone or at yourself. Fill another clean and dry test tube with NaHCO3 and begin again. Place 50 mL of water in a 100 mL graduated cylinder. 0016 moles respectively. As a teacher, my favorite scenario was when different groups would have different conclusions and, consequently, different chemical reactions proposed. Some groups only recorded the mass of their sodium bicarbonate, without considering the mass of their test tube and glass stir rod.
Stoichiometry Lab Answer Key
Can two or more ideas be combined to produce a better solution? 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. EXPERIMENTAL PROCEDURE. Tell students that they should try to get the foam to stop as close as possible to the top of the cylinder without overflowing. 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. Using a plastic pipet, add 10% hydrochloric acid (HCl) solution slowly to test tube 1. Students will also change the amount of one or more reactants and see how the change affects the amount of products. What are the constraints? Armed with these understandings, there will be no limit to their success! Stoked About Stoich - Sodium Bicarbonate and Citric Acid. This water must also be evaporated. 1 Internet-trusted security seal. Divide this detergent solution equally into one small cup for each group.
5) Student-driven experimental design.