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Temperature vs time graph for endothermic reaction

27/11/2021 Client: muhammad11 Deadline: 2 Day

Module 12

Virtual Lab - 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. In this lab, you will study various reactions using a calorimeter to determine if they are exothermic or endothermic and determine the heat of reaction (ΔHrxn) for each.

OBJECTIVES
In this experiment, you will

· Become familiar with using a virtual calorimeter to determine whether a reaction is exothermic or endothermic

· Interpret calorimeter data using a temperature versus time graph.

· Calculate the heat of reaction for various chemical reactions

PROCEDURE

Go to: https://media.pearsoncmg.com/bc/bc_0media_chem/chem_sim/calorimetry/Calor.php

Click on “Experiment” tab.

Click on “Run Experiment” button (If you wish, you may click on the “Watch Demo” tab)

Part I Potassium Chloride in Water

1. Beneath the beaker on the balance, choose the solid tab.

2. Using the pull-down menu for solids, choose potassium chloride (KCl).

3. Set the mass to be 10.0 g using the slider.

4. Keep the temperature at 20.0 Celsius

5. Click on the “Show ΔH” button.

6. Click NEXT which will take you to the settings beneath the calorimeter.

7. Beneath the calorimeter, choose the liquids tab.

8. Choose water as your liquid.

9. Set the mass to be 150.0 g using the slider.

10. Keep the temperature at 20.0 Celsius

11. Click on the “Show ΔH” button.

12. Click NEXT which will allow you to start the calorimetric experiment.

13. Under the “Run Experiment” tab, click both “Show Graph View” AND “Show Microscopic View”

14. Click START to begin your calorimetric experiment!

15. The initial temperature was 20.0 degrees; RECORD your final temperature

Part II NaOH and HCl Neutralization Reaction

1. Click on the reset button to begin a new experiment. Beneath the beaker on the balance, choose the “Solutions” tab.

2. Using the pull-down menu for solutions, choose sodium hydroxide (NaOH)

3. Set the volume to be 50.0 mL using the slider.

4. Set the molarity to be 1.0 M using the slider.

5. Click on the “Show ΔH” button.

6. Click NEXT which will take you to the settings beneath the calorimeter.

7. Beneath the calorimeter, choose the “solutions” tab.

8. Using the pull-down menu for solutions, choose hydrochloric acid (HCl)

9. Set the volume to be 50.0 mL using the slider.

10. Set the molarity to be 1.0 M using the slider.

11. Click on the “Show ΔH” button.

12. Click NEXT which will allow you to start the calorimetric experiment.

13. Under the “Run Experiment” tab, click both “Show Graph View” AND “Show Microscopic View”

14. Click START to begin your calorimetric experiment!

15. The initial temperature was 20.0 degrees; RECORD your final temperature

Part III: Your Turn to Experiment with Your Virtual Calorimeter!

1. Beneath the beaker on the balance, choose the solid tab.

2. Using the pull-down menu for solids, choose a solid of your choice (but not potassium chloride!).

3. Set the mass to be whatever you wish using the slider.

4. Keep the temperature at 20.0 Celsius

5. Click on the “Show ΔH” button.

6. Click NEXT which will take you to the settings beneath the calorimeter.

7. Beneath the calorimeter, choose the liquids tab.

8. Choose water as your liquid.

9. Set the mass to be whatever you wish using the slider.

10. Keep the temperature at 20.0 Celsius

11. Click on the “Show ΔH” button.

12. Click NEXT which will allow you to start the calorimetric experiment.

13. Under the “Run Experiment” tab, click both “Show Graph View” AND “Show Microscopic View”

14. Click START to begin your calorimetric experiment!

15. The initial temperature was 20.0 degrees; RECORD your final temperature.

16. Take a SCREEN SHOT of your completed experiment (and include it on Question 6 of the Post Lab Assignment)

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