• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

testing liquis for polarity

Extracts from this document...

Introduction

IB CHEMISTRY TOPIC 4 - BONDING Testing Liquids for polarity Results and Observations: Liquids Results Shape of molecule or Lewis Structure Conclusions Distilled Water 4 cm of deflection The water molecule is very polar. This is because the only oxygen in the molecule is left with 2 lone pairs which give as a result an enormous negative center. On the other hand, the two H atoms are positive resulting into a very polar molecule. As a result, the stream of distilled water has a quite large deflection which almost went out of the beaker. Heptane 2 mm of deflection The deflection is very small, almost impossible to detect. Because of this we can conclude that this molecule is non-polar as no attraction towards the charged ruler is shown. Ethanol 3 to 4 cms of deflection In this case, the deflection of the stream is bigger and more obvious to human eye. As we can see in the structure of the molecule, the oxygen atom is left with 1 lone pair which makes it into a medium size negative center. ...read more.

Middle

Another factor is the presence of H and C atoms in both sides of the O atoms which balance the forces of the lone pairs. In conclusion, although it's a polar molecule, due to the position of the O atoms and the H and C atoms, Ethyl Acetate didn't deflected that much the stream Ethane-1,2-diol 4 to 5 cms of deflection This molecule is clearly polar because of the great 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 Order of Polarity Downwards HEPTANE PROPANONE PROPANOL ETHYL ACETATE ETHANOL DISTILLED WATER ETHANE-1,2-DIOL ETHANOIC ACID Camilo Lovera Trujillo Testing Liquids for polarity Evaluation / Improvements: Limitations / Errors Improvements * Bad smell of substances. * Many of the substances we were working with, had a very strong and bad odor which spread all the way over the class. Due to this smell, many of the students found difficult to concentrate and to be able to record correctly the deflection of the streams. ...read more.

Conclusion

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, there's a final conclusion to be made and is about the order 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 part of the 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 polarity Bibliography for Images of Lewis Structure and Molecular 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. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. Kinetics of the Acid-Catalyzed Iodination of Propanone

    separate measurements each time when adding the certain number of moles of each of the four solutions., Therefore it is necessary to multiply 0.01 mL by the four different solutions and then determine the overall percentage uncertainty of the solutions.

  2. IB chemistry revision notes

    Catalysts * Increases the rate at which equilibrium is reached. The point of equilibrium does not change. * They affect backward and forward reactions equally. * Changes the reaction pathway for the reactions in question.

  1. liquids polarity

    attraction towards the high negative charged O; but the other O is placed besides the same C atom which will also exert an negative charge and a big attraction on C. Other carbons will have a high force between the single bond O, while the left hydrocarbons will share with both Oxygen; and here we'll found two different charges (+,-)

  2. Factors Affecting Angle of Deflection

    The type of liquid used, in this case water. The charged rod that is being used. The charge on that rod, therefore if being used by rubbing use the same number of rubs. The laboratory in which the experiment is carried out should have no drafts that will affect the deflection of the liquid.

  1. A Comparison of Strong and Weak Acids and Bases

    The base, NaOH(aq) comes next with conductivity of 26531�s for 0.10M NaOH(aq) and 2969�s for 0.01M NaOH(aq). Next comes the weak acid, CH3COOH(aq) at 2005�s for 1.00M of CH3COOH(aq). Its ability to conduct electricity is lower to that of HCl(aq) because weak acid only partially dissociates, thus less H+(aq)

  2. Strong and Weak Acids And Bases

    Human errors were much more significant in using the ph meter. Contamination between the acids could have occurred, when the pH meter was used to test the different acids. The graphs the ph meter and the computer produced may have also been inaccurate because the solution was not stirred enough with probe, while the computer was taking in the results.

  1. The Polarity of a Compound. We also determined that Water (H2O), is the most ...

    But, sinse there is no poles causing an attraction, the liquid will be changed ever so slightly and will be pulled to the pole but only be a miniscule amount as the opposite pole will reduce it attraction Some odd occurances have also occurred in which although ethanol and methanol

  2. The chemistry of atmospheric and water pollution.

    + O. (g) ï Cl .(g) + O2 (g) Ozone is destroyed. The chlorine free radical is free to destroy thousands of more ozone molecules just like this until it reacts with methane. Ozone depletion is more frequent in winter and spring due to more ice particles.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work