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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. Ask students about baking soda: - Sodium bicarbonate is baking soda. 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. As absurd as this seems to you and me, it seems plausible to many of them. Chemical Change, Observations, Inferences, Chemical Change, Interdisciplinary | Elementary School. Sometimes it is hard to reduce, let alone eliminate, previous conceptions and biases when asking students to develop an argument from evidence. Stoichiometry and Chemical Reactions: Which Balanced Chemical Equation Best Represents the Thermal Decomposition of Sodium Bicarbonate? If there's one thing virtually all chemistry teachers can agree on, it's that stoichiometry is a difficult topic for students.
In this lesson, students will extract DNA from strawberries and analyze evidence to figure out who perpetrated a petty crime. Some groups only recorded the mass of their sodium bicarbonate, without considering the mass of their test tube and glass stir rod. What could you change to create a foam that rises as close as possible to the top of the cylinder without overflowing? Students should realize the necessity of making and recording accurate measurements in the chart provided. In this demonstration, students will observe a reaction between baking soda and vinegar in the presence of a burning candle. Swirl gently to mix. 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!
Atoms from the reactants rearrange to form the products. 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. Stoked About Stoich - Sodium Bicarbonate and Citric Acid. To achieve this, I opened my Argument-Driven Inquiry in Chemistry (ADI) book and happened to find a wonderful example. Conservation of Matter, Chemical Change, Photosynthesis, Balancing Equations, Reversible Reactions, Molecular Formula, Molecular Structure, Conservation of Mass, Interdisciplinary, Matter, Elements, Monomer | Elementary School. Chemical Change, Exothermic & Endothermic, Acid Base Reactions, Chemical Change | Elementary School. Every test should be conducted the same way. You may choose to limit students to a maximum of three tries or let them experiment further if time and supplies allow. 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. Something funny starts to happen when 0. Students might mention variables such as: The amount of vinegar, detergent, or baking soda and the order in which the substances are added to the graduated cylinder. Students will be able to count the number of atoms on the reactant side and on the product side of a chemical equation. 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.
Measuring spoons (⅛, ¼, and ½ teaspoon). In trials 4 and 5, there is not a proportional increase, indicating that some of the citric acid did not react. Students will see that the gas produced in the actual reaction is also written in the products of the equation. It is best to rinse the cylinder after each trial. Tell students that an Alka-Seltzer tablet contains aspirin, sodium bicarbonate, and citric acid. Have each group experiment with different amounts of vinegar and baking soda in order to get the foam to rise to the top of the graduated cylinder without overflowing.
Evaluate the claims, evidence, and reasoning behind currently accepted explanations or solutions to determine the merits of arguments. Atomic weights are found below the element symbol on the periodic table. Also be sure that they see that there is an equal number of each type on both sides of the equation. Pour the vinegar in a small cup and add 1 drop of detergent.
Every weighing must be carefully done in order to obtain good results. You know their gut instinct will be to suggest it decomposes into sodium and bicarbonate. When a drop of HCl produces no additional CO2 bubbles, the reaction is complete and no more HCl should be added. Once all of the solid has dissolved, continue to add HCl but now do it dropwise (agitating the test tube after each drop). NaHCO3 that reacts, one NaCl is produced. All new trials should be conducted this same way. USLegal fulfills industry-leading security and compliance standards. Continue adding HCl slowly until all of the solid has dissolved. Materials for Each Group.
Questions that challenge the premise(s) of an argument, the interpretation of a data set, or the suitability of a design. Give each Student an Activity Sheet. The mass of NaHCO3 in each test tube should be ~ 0. Sodium, hydrogen, carbon, and oxygen (Na, H, C, and O). With a marker pen, label each test tube near the top 1, 2, and 3, respectively. In this lab, students will conduct a chemical reaction that will be used to launch a rocket. Fill in every fillable field. Teacher Preparation for the Demonstration and for Each Group. While merit for such a lab can be argued for, I really wanted to immerse my students in an actual investigation that more accurately reflected the scientific skills I try to advocate for—experimental design, data collection, analysis, creating an argument from evidence, engaging in argument, etc. Lay each empty test tube flat on the balance pan. What atoms is sodium bicarbonate made of? Usually vinegar is a solution of about 5% acetic acid and 95% water. There's the reason for the 3:1 ratio of moles of sodium bicarbonate and citric acid! They will also be able to explain why simply adding more and more of one reactant will eventually not produce additional products.
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