Experiment nº5: Practical use of Gay Luissac's law

Objective:
The aim of the experiment is to observe and understand how the pressure of a gas changes in relation with the temperature at which the gas is submerged.

Materials:

• Container
• Stand
• Clamp
• Bunsen Burner
• Wood pieces
• Tripod
• Schlenk
• Water
• Lighter
• Electronic thermometer
• Magnet
• Magnetic stirrer
• Manometer

Explanation of the relation between temperature and pressure. (Elisa Millán)

According to Gay-Lussac’s law, for a given amount of gas held at constant volume, the pressure is proportional to the absolute temperature. As we can see in the image above the relationship between volume(y) and temperature(x) is a directional proportion for a constant pressure but when volume is held constant we will find an inverse proportional relationship between pressure(y) and temperature (x). We can observe this relationship using the following formula:

P/T=K

Oral procedure by Marina Bayón Rueda:

Results:

Conclusion1 by Carmen Lérida Borrero:

Conclusion 2 Claudia Falcón Morales: 

References used in order to explain the Gay-Lussac's law:

• Chemed.chem.wisc.edu (n.d.). Untitled. [online] Retrieved from: http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Gay-Lussac-s-Law-952.html [Accessed: 9 Mar 2013].
• Grc.nasa.gov (2008). Charles and Gay-Lussac's Law - Animated. [online] Retrieved from: http://www.grc.nasa.gov/WWW/k-12/airplane/aglussac.html [Accessed: 9 Mar 2013].

Experiment nº4: Introduction to galvanic cells and redox couples.

In this class there were two tasks performed:

Objective 1:
The aim of this lab session is to prepare a battery with the following redox couples:

In order to achieve this you will use a polymeter and a salty bridge.

Objective2:
The aim of this lab session is to obtain energy from the mixture of two redox couples.

Materials:

• Copper(2+)
• Elemental iron
• Elemental zinc
• 2 test tubes
• Test tube rack

Procedure

1.       Choose  2 redox couples which we are going to work with.

2.        Get two small test tubes.

3.       Mark each test tube with the corresponding couple, in this case Cu²⁺with Fe and Cu²⁺ with Zn.

4.       Pour the copper in each test tube until it reaches half of it.

5.       Add the zinc to one test tube and iroin to the other.

6.       Wait until it reacts.

7.        Note the reactions you see.

 Performing the experiment by Carmen Lérida Borrero

                                                                Conclusion

Explanation of the reactions by Marina Bayón Rueda

Reflection

Weak and strong points by Elisa Millán Chica

Usefulness of this experiment by Claudia Falcón Morales