EndoExo_Lab

EndoExo_Lab - Endothermic and Exothermic Reactions Many...

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Endothermic and Exothermic Reactions Many chemical reactions give off energy. Chemical reactions that release energy are called exothermic reactions. Some chemical reactions absorb energy and are called endothermic reactions. You will study one exothermic and one endothermic reaction in this experiment. In Part I, you will study the reaction between citric acid solution and baking soda. An equation for the reaction is: H 3 C 6 H 5 O 7(aq) + 3 NaHCO 3(s)  → 3 CO 2(g) + 3 H 2 O (l) + Na 3 C 6 H 5 O 7(aq) In Part II, you will study the reaction between magnesium metal and hydrochloric acid. An equation for this reaction is: Mg (s) + 2 HCl (aq)  → H 2(g) + MgCl 2(aq) Another objective of this experiment is for you to become familiar with using the CHEMBIO data- collection program on the TI Graphing Calculator. In this experiment, you will use the program to collect and display data as a graph or list, to examine your experimental data values on a graph, and to print graphs and data lists. MATERIALS Figure 1 PROCEDURE 1. Obtain and wear goggles. Part I Citric Acid plus Baking Soda 2. Plug the temperature probe into the adapter cable in Channel 1 of the CBL System. Use the link cable to connect the CBL System to the TI Graphing Calculator. Firmly press in the cable ends. 3. Pipet out 10 mL of citric acid solution into your ignition tube and then place the ignition tube in a ring stand as shown in Figure 1. Place the temperature probe into the citric acid solution. 4. Weigh out 3.000 g of solid baking soda on a piece of weighing paper. 5.
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This note was uploaded on 11/09/2011 for the course CHEM 100 taught by Professor Sdfsdf during the Winter '08 term at BYU.

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EndoExo_Lab - Endothermic and Exothermic Reactions Many...

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