Testing Liquids for polarity Essay Example for Free

examen Liquids for house EssayResults and ObservationsLiquidsResultsShape of jot or Lewis StructureConclusionsDistilled Water4 cm of stymieionThe water molecule is actually polar. This is because the entirely oxygen in the molecule is left with 2 unaccompanied pairs which give as a number an enormous banish center. On the other hand, the two H atoms are unequivocal resulting into a in truth polar molecule. As a result, the stream of distilled water has a quite large deflection which both(prenominal) went out of the beaker. Heptane2 mm of deflectionThe deflection is real small, almost impossible to detect. Because of this we can come to an end that this molecule is non-polar as no attraction towards the charged regulation is shown.Ethanol3 to 4 cms of deflectionIn this lesson, the deflection of the stream is bigger and more(prenominal) obvious to human eye. As we can forecast in the anatomical structure of the molecule, the oxygen atom is left with 1 alone(pred icate) pair which makes it into a long suit size negative center. However all the carbons and the hydrogen atoms in the left of the oxygen exert a positive charge bigger than the negative charge which makes it polar. However although there is polarity, the stream isnt deflected so much. propyl alcohol3 cm of deflectionAlthough the structure of this molecule is quite similar to the one of HEPTANE, in the exercise of PROPANOL, we can see an oxygen atom which again is left with 1 lone pair1 which creates a negative center in the right of the molecule. However, this negativity is agreementd thanks to the C and H atoms in the left. This is means this molecule is polar but not enough to deflect the stream so much. This is why it shows a medium deflection of 3 cms.Propanone2 cm of deflectionThis molecule shows as very weak polarity because the only way of this molecule being polar is the double bonded Oxygen-Carbon bond. Oxygen is more electronegative than carbon which gives as a resul t a very weakly charged dipole. In conclusion, the stream wont deflect a lot.Ethanoic Acid5 cm of deflectionIn the case of this molecule, we can see 2 O atoms which in total are left with 3 lone pairs which create a gigantic negative center. The rest of the atoms of the molecule arent cap equal to(p) of dealing with these forces so the molecule turns out extremely polar. This is why we can see a very big deflection in this case.ethyl acetate3 cm of deflectionThis is a moderately polar molecule which shows a medium deflection of the stream. This is because although it has 2 O atoms one of them located on the top of the molecule, the lone pairs of these O atoms cant exert that big amount of negative force as to create a very polar molecule. Another factor is the charge of H and C atoms in both sides of the O atoms which balance the forces of the lone pairs. In conclusion, although its a polar molecule, due to the position of the O atoms and the H and C atoms, Ethyl Acetate didnt defl ected that much the streamEthane-1,2-diol4 to 5 cms of deflectionThis molecule is clearly polar because of the bulky deflection that is caused by it. There are two O atoms each one with a lone pair which creates a very powerful negative center which makes the molecule to be polar.Increasing dress of Polarity DownwardsHEPTANEPROPANONEPROPANOLETHYL ACETATEETHANOLDISTILLED WATERETHANE-1,2-DIOLETHANOIC ACIDCamilo Lovera Trujillo Testing Liquids for polarityEvaluation / ImprovementsLimitations / ErrorsImprovements* Bad smell of substances.* Many of the substances we were working with, had a very strong and adult odor which spread all the way over the class. Due to this smell, many of the students found concentrated to contract and to be able to record correctly the deflection of the streams. Its better if the students wear any type of screen or mouth covering so that focusing of students isnt affected by the smell.* Electrically-charged rod* For being able to deflect the stream of the substances it was necessary to have an electrically charged rod which could attract the stream However, is difficult to keep a fair test in charging the rule or the rod because it was possible that in some cases, the rod was more charged than others. A possible solution to this is to change the rod for a magnet or and object which is already magnetized so that the same attraction force is kept during all the experiment and no possible inaccuracy in the deflection of the streams can happen.* Deflection* The deflection, in some cases, was difficult to record. Unfortunately, we had no instrument to measure the deflection but our own eyes. It was possible to use the ruler but it was also very difficult as everything happened very fast. Due to this, there might be some inaccuracy in the results as they were recorded with what we saw and estimated to be the deflection. Maybe a way to serving recording more accurately the information is to use instead of a beaker, a kind of trench tr ansparent tray placed over a ruler so that is easier to measure the deflectionCamilo Lovera Trujillo Testing Liquids for polarityConclusionIn conclusion, this practical helped us to find the relationships between the Lewis structure or the molecule structure and the deflection the substances caused when they were near to an electrically-charged rod. From the observations and results we can also conclude that the C atoms reduce the polarity of the molecules as they created positive center in the molecule. However, it was thanks to the O atoms n most of the molecules that their polarity was considerably increased as they were left with lone pairs which helped to create negative center even bigger than the positive ones and due to this, deflect more the streams. On the other hand, theres a final conclusion to be made and is about the direct of the polarity. Acids are the most polar substances just after the amides. In the case of Ethanoic Acid, we can see that it makes discover of th e most polar substances tested in this experiment as a result of the H bondings and the presence of the 2 atoms of O. Going down the list we will find Alcohols, Ketones, Aldehydes, Amines, Esters, Ethers and Alkanes.Camilo Lovera Trujillo Testing Liquids for polarityBibliography for Images of Lewis Structure and molecular(a) Structures* http//www.chem.purdue.edu/gchelp/molecules/heptane.gif* http//www.uni-saarland.de/fak8/schneider/anichem/struktur/ethanol.gif* http//www.fisicanet.com.ar/quimica/organica/ap1/propanol01.gif* http//www2.open.ed.jp/data/37561/01/1221system/images/CH3COCH3.jpg* http//scienceaid.co.uk/chemistry/organic/images/ethanoicacid.jpg* http//www.steve.gb.com/images/molecules/alcohols/ethane-1,2-diol.pngBibliography for additional Information* http//www.elmhurst.edu/chm/vchembook/213organicfcgp.html