Chemical … More specifically, it was between these two reactions: Calcium Chloride & Water (Calcium Chloride is used to melt ice on your driveway) Baking Soda & Citric Acid (Baking soda is heavily used in many baking products. Endothermic means you have to put energy (heat) in to make the reaction go while exothermic means there's energy (heat) left over. Chemical reactions are either endothermic or exothermic. Chapter 5 Lesson 9 addresses temperature changes as bonds between a solute are broken and the bonds between the solute and water … Then, place a thermometer into the baking soda solution. Measure 1/4 cup baking soda into the Styrofoam cup. Define endothermic and exothermic in your own words. Note: Some of the temperature increase in this reaction may be due to the chemical reaction between baking soda and calcium chloride, but some is also due to the exothermic way calcium chloride dissolves in water. Endothermic means you have to put energy (heat) in to make the reaction go while exothermic means there's energy (heat) left over. Students then perform 10 more chemical reactions with unknown powders (labeled A - F) and liquids … Teacher may elaborate as desired. (You may want to let the children touch the solution and compare to the room temperature water. Chemical reactions are either endothermic or exothermic. For baking soda and vinegar, the reaction will become cold, because this reaction … Place about 10 mL of baking soda solution in a small plastic cup. Melting and freezing of ice (endothermic and exothermic) Baking soda and water (exothermic) Hot packs and cold packs (endothermic, endothermic) Define terms and list on board (students write in notebooks). The baking soda and vinegar reaction is endothermic because once combined the temperature of the mixture lowers, meaning the energy was absorbed, as opposed to an exothermic reaction where once two ingredients are mixed together the temperature increases. Baking soda and water is exothermic and so the water gets a little warmer. The heat of the water in the calorimeter decreases (giving you a -deltaH), which means that the system absorbed heat, making the reaction endothermic. If energy is consumed (an endothermic reaction) it is taken from the water, making the water colder (an endothermic reaction). So, to determine whether a reaction is endothermic or exothermic, use a thermometer to measure the temperature! It is endothermic. Stir until no more baking soda will dissolve. In an endothermic process, a system absorbs heat from its surroundings. As the reaction starts to slow, take the temperature again. In a sink or similar area, quickly add the drink mix solution to the baking soda in the Styrofoam cup. Left over heat will raise the temperature. In this lab, we asked the question: "Which reaction is endothermic?" Citric Acid is found in Lemon Aide … Record the initial temperature … Based on their observations, students are then asked to explain the evidence that a chemical reaction occurred. Classify each of the following as an exothermic or endothermic process. Baking soda and water is exothermic and so the water gets a little warmer. Left over heat will raise the temperature. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us … Each pair of students is assigned either an exothermic or endothermic reaction. Baking Soda and Calcium Chloride. Make a baking soda solution by dissolving about 2 tablespoons of baking soda in 1 cup of water. 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