Virtual Lab: Camping Problems (I-II-III)

Virtual Lab: Camping Problem I

 

 La discusión de esta actividad via twitter se llevará a cabo bajo los hashtags: 

#FQ-BIO-2020-II #FQ-BIO-VIRTUAL-LAB

Measure the enthalpy of a reaction

“Thermochemistry : Camping 1”.

You and a friend are hiking the Appalachian Trail when a storm comes through. You stop to eat, but find that all available firewood is too wet to start a fire. From your Chem 106 class you remember that heat is given off by some chemical reactions; if you could mix two solutions together to produce an exothermic reaction, you might be able to cook the food you brought along for the hike. Luckily, being the dedicated chemist that you are, you never go anywhere without taking along a couple chemical solutions, just for times like this. The Virtual Lab contains aqueous solutions of compounds X and Y of various concentrations. These compounds react to produces a new compound, Z, according to the reaction:

X + Y --->> Z

The following activities will guide you in using this reaction to produce the heat needed to warm up your food.

  1.   Use the virtual lab to measure the enthalpy of the reaction shown above.

http://chemcollective.org/vlab/94


Virtual Lab: Camping Problem II

Camping 2:

Determine change in the enthalpy of a reaction as the concentration of reactants are varied

 

...Continued from problem, Camping 1…

  1. To design the solutions you will need to heat your food, you can obtain valuable data by mixing:

    1. 100 mL of 0.1 M Solution X with 100 mL of 0.1 M Solution Y

    2. 50 mL of 0.1 M Solution X with 50 mL of 0.1 M Solution Y

    3. 100 mL of 0.1 M Solution X with 100 mL of 0.2 M Solution Y

    4. 100 mL of 0.2 M Solution X with 100 mL of 0.1 M Solution Y

    5. 100 mL of 0.2 M Solution X with 100 mL of 0.2 M Solution Y

Make each of these mixtures in the Virtual Lab. Explain the temperature changes you observe in terms of the various volumes and concentrations involved. 

 

http://chemcollective.org/activities/info/95

Virtual Lab: Camping Problem III

Continued from problem, Camping 1 and 2…

  1. Using the virtual lab, create two solutions, initially at 25oC, that, when mixed together in equal volumes, cause the temperature of the mixture to increase from 25°C to 60°C.


  1. Using the virtual lab, create two solutions initially at 25oC that, when added to 100ml of water at 25oC, will produce a final solution with a temperature of 600C.


http://chemcollective.org/vlab/96


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