Surface Tension of Deionized Water | Experiment

Surface Tension of Deionized Water | Experiment Abstract Surface tension of deionized water was measured across a range of 0 ml to 4.8 ml of two different compounds by dropping a solute onto a penny until the surface tension was broken. The uncertainty in the measurements varied between 0.02 0.11 for granulated sugar and 0.6 0.14 for table salt. Reference tables and charts were developed using the experimental data. Introduction Water is very important to all biological systems on Earth and is one of the more unique molecules. Without it life on Earth, or possibly on other planets, could not exist. The molecular structure of water is what makes it so unique. Water is a polar covalent molecule meaning that one part of the molecule can have a positive charge and the other part a negative charge. Because water is a partially polar molecule it possesses many important biological characteristics that make it crucial to creating and maintaining life on Earth. (Conway, A, et al.) The partial polarity of water is important as it allows soluble polar molecules and ionic compounds to dissolve in it, such as sugar and salt. This allows fundamental biological reactions to occur which are crucial to life. Another important characteristic of water is hydrogen bonding. This is a weak bond that forms between hydrogen atoms and other nearby atoms. This bond is established between the negatively charged oxygen atom of a water molecule and the positively charged hydrogen atoms of another nearby water molecule. (Conway, A, et al.) Hydrogen bonds also display two other characteristics which are cohesion and surface tension. Surface tension is defined as the expression of the resistance which liquids show in response to an increase in their surface area. This is caused by the strong attraction of molecules of the same kind in the surface layer of the liquid which is called cohesion. Cohesion causes the liquid to behave as if it were covered in a thin membrane under tension. This is a result of the molecules in the interior of the liquid interacting equally with molecules from all sides, while oxygen molecules at the surface of the liquid are only affected by the molecules below it. The stronger surface bonds generate a net inward force, pulling the surface molecules toward the middle of a droplet of liquid which causes the molecules to resist being pulled apart. (University of Hawaii) As gravity presses down on a droplet of liquid, the cohesive forces inside the liquid are stronger than the force of gravity within the small surface area which allows the droplet to hold its shape. As more droplets are added to the surface area the more molecules are added and the larger the droplets surface area becomes. As the size of the surface area increases, the amount of force that gravity exerts on the surface of the droplet also increases. As more molecules are added to the droplet, the cohesive forces inside the liquid will struggle to hold its shape. The force of gravity will eventually overpower the cohesive forces within the liquid and the droplet will break. Apparatus/Method/Procedure For this experiment the following apparatuses and compounds were used: Deionized water at room temperature Granulated sugar Table salt One penny One 1.0 ml syringe Plastic cups Toothpicks Paper towels About 30 ml of deionized water was added to 5 plastic cups and numbered 1 through 5. In the first cup the deionized water was left just as it is. In the second through the fifth cups, granulated sugar was added in multiples of about 1.2 ml. The sugar mixture in each cup was swirled and mixed with a toothpick until fully dissolved. One further cup filled with about 100 ml of deionized water was also used for rinsing the syringe. Cup Number Deionized Water Granulated Sugar Added (multiples of about 1.2 ml) 1 30 ml 0 2 30 ml 1 3 30 ml 2 4 30 ml 3 5 30 ml 4 One newer looking penny was washed thoroughly with hot water, dried completely with a paper towel and placed on a flat work surface. The syringe was then filled completely to the 1.0 ml line using the first cup of deionized water. The water was then released from the syringe onto the surface of the penny drop by drop until the surface tension broke and the water spilled over the side of the penny. The amount of liquid used right up until the surface tension broke was then recorded for each cup. The amount of times the syringe needed to be filled for each cup was also recorded. This was then repeated five times for each cup with increasing amounts of granulated sugar. The penny was rinsed in hot water between each cup. The syringe was also rinsed out between each cup from the extra cup of deionized water. The same side of the penny was used throughout the experiment to ensure continuity. The entire experiment was then carried out again using increasing multiples of table salt. Results and Discussion   Ã‚   Granulated Sugar Just Water 1.2 ml 2.4 ml 3.6 ml 4.8 ml No. Times Syringe Filled Cup 1 1.52 1.65 1.66 1.45 1.45 2 Cup 2 1.55 1.62 1.65 1.5 1.52 2 Cup 3 1.57 1.67 1.61 1.5 1.45 2 Cup 4 1.59 1.59 1.5 1.4 1.42 2 Cup 5 1.3 1.66 1.55 1.41 1.45 2 7.53 8.19 7.97 7.26 7.27 /5 1.51 1.64 1.59 1.54 1.45 0.11 0.09 0.06 0.04 0.02 Table 1: Results of granulated sugar experiment. The values of each set of cups were added together to get the mean or . The sum was then divided by 5, which is the number of tests that were conducted from each cup, to get an average number for each set of tests. In example: Just water-granulated sugar experiment- 1.52 1.55 1.57 1.59 1.30 /5 = 1.506 1.51 squared was then subtracted from each cup result- 1.52 (1.51 = 0.0001 1.55 (1.51   = 0.0016 1.57 (1.51   = 0.0036 1.59 (1.51   = 0.0064 1.30 (1.51   = 0.0441 The square root of sum over 4 was then done to get the standard deviation or ÏÆ'. So: This was then repeated for all cups with the results listed on tables 1 and 2. Table Salt Just Water 1.2 ml 2.4 ml 3.6 ml 4.8 ml No. Times Syringe Filled Cup 1 1.51 1.5 1.37 1.3 1.4 2 Cup 2 1.75 1.46 1.39 1.2 1.45 2 Cup 3 1.43 1.25 1.3 1.24 1.35 2 Cup 4 1.67 1.45 1.43 1.35 1.3 2 Cup 5 1.43 1.45 1.27 1.35 1.25 2 7.79 7.15 6.76 6.44 6.75 /5 1.59 1.43 1.35 1.29 1.35 0.14 0.1 0.06 0.06 0.07 Table 2: Results of table salt experiment. The pooled sample variance was then taken for both the granulated sugar and the table salt. First all the squared readings were added together and then divided by 24 Granulated Sugar: Table salt: The sum was then square rooted to get the pooled standard deviation. Pooled Standard Error: Pooled T Statistic: Granulated Sugar:   Table salt: Graph 1: Results of granulated sugar experiment. Graph 2: Results of table salt experiment. 1. What effect(s) are the solutes having on the surface tension of water? The surface tension results for the granulated sugar experiment varied depending on how much sugar was in each cup. Interestingly the highest surface tension results were from cups 2 and 3. The higher surface tension of the sugar may result from how well the sugar was dissolved in the water as it was much harder to dissolve than the table salt. As expected, the table salt results in each cup showed a slight decrease in the surface tension of the water compared with the plain distilled water. 2. Are your findings consistent and reproducible? A consistent water temperature was maintained throughout the experiment as well as using the same penny and the same side of the penny. Results were slightly inconsistent from the same cup but this could be attributed to how far away I was holding the syringe from the penny and how fast I was dropping the water. The inconsistencies were very minimal and the results can be reproduced inside the margin of error. 3. Can you explain the scientific basis for any effects observed? Depending on the compound added to the water it will either, cause a lower surface tension by depleting the surface molecules at the water air interface, or make the bonds stronger by pulling more molecules toward the middle of the droplet which increases the water air interface. As the sugar was harder to dissolve in the water, the solute concentrated more on the surface thereby making the bonds stronger. The negative result from the salt can be attributed to the salt staying in the solute rather than concentrating on the surface. 4. Are there alternative explanations? None that I can find. 5. Does the chemical nature of the solute matter? Some liquids have stronger cohesive forces than others. Water molecules have some of the strongest cohesive forces due to being a polar covalent molecule. The stronger the cohesive bonds are inside the liquid, the larger a droplet will be able to grow before it is overcome by the force of gravity. 6. Do your results agree with the same or similar measurements that you might find in the literature? The results of this experiment came out as expected according the literature in provided to us as well as in the citations; both with the varied results of the granulated sugar and the generally descending results of the table salt. 7. Are there any sources of inaccuracy or potential flaws in the methodology used? Can you suggest modifications to the experimental protocol in the light of your evaluations? How far away the syringe was held from the penny as well as how fast the drops were let either increased or decreased the surface tension. How well the penny was cleaned in between each test could also affect the surface tension. To improve the results a drop counter could be used which precisely controls the amount of liquid in each drop as well as the time between drops. 8. Link your work to the concepts introduced in the introductory passage of this experimental brief. Think about how the results might have relevance to the initial formation of life, and reflect on how they relate to the module materials in Sections 1 to 6. ie discuss the experiment in the context of Astrobiology. Water is crucial to the formation of life on Earth as its able to dissolve many common substances making known as the universal solvent. This is important as reactants must be dissolved in water for most biological reactions to occur. The hydrogen bonds formed by water are also important as they can be found in the DNA of many living organisms as it helps to keep the DNA chains together. The high surface tension of water and its cohesive properties of water allow trees and plants to pull water up from their roots to their leaves. This same process is also essential for blood transport in animals. For life to form on other planets it can be assumed that it will need a solvent like water to enable chemical reactions and to transport materials. (Conway, A, et al.) Conclusion Overall the experiment succeeded in showing that the strength of a cohesive bond inside the solute is dependent upon which compound is dissolved in it. It also showed that the cohesive bond in the surface tension of the solvent is also effected by how much of the compound was dissolved in the solute. Differences existed in the experimental data of the granulated sugar and the table salt, however, these can be accounted for by experimental error. Bibliography   Ã‚   Conway, A, et al. 2003. Origin of Life. 2003. In: Rothery, Gilmour and Sephton (eds). An Introduction to Astrobiology. pp. 3-15, 8-10. Cambridge University Press. University of Hawaii. 2017. Types of Covalent Bonds: Polar and Nonpolar. [ONLINE] Available at: https://manoa.hawaii.edu/exploringourfluidearth/?q=chemical/properties-water/types-covalent-bonds-polar-and-nonpolar. [Accessed 27 February 2017]. Shakhashiri . 2011. Water. [ONLINE] Available at: http://scifun.chem.wisc.edu/CHEMWEEK/PDF/COW-Water-Jan2011.pdf. [Accessed 27 February 2017].

The Great Gatsby: How It Applies to Modern Society

The Great Gatsby: How it Applies to Modern Society The people in F. Scott Fitzgerald’s novel The Great Gatsby are very alike the people in our generation today. They’re alike in the way they depict racism, irresponsibility, and corruption. The two generations however; also share people who display integrity and honesty. The two generations show irresponsibility and corruption through many characters like Myrtle, Meyer Wolfshiem and Tom. After Myrtle bought the dog she had taken no care after the dog. She never walked it, didn’t consistently feed it, and the dog was later found lying around by himself.Tom was irresponsible and prejudice towards other races which were different from his own. His Irresponsibility was shown when he was having an affair with Myrtle and not staying faithful to Daisy. Tom’s prejudice was revealed when he said â€Å"nowadays people being by sneering at family life and family institutions and next they’ll throw everything o verboard and have intermarriage between black and white. † In today’s society it seems like it’s every other day where someone is discriminated against because they are thought to be inferior for skin color, religion, etc.Also during the roaring 20’s there was many gangs and mob leaders like the terrorizing Al Capone who were corrupt with power. He was a racketeer who had many wars with other gangs. Today there is also a lot of gang violence going on today between all sorts of different cliques and they all search for the power that Al Capone once had. Even though there are a significant amount of people who are irresponsible and discriminate there are also a large number of people who act with integrity and help others with enormous generosity.Everyone was first afraid of Gatsby because they thought he was a killer but turns out he was a compassionate man. When Nick says â€Å"They’re a rotten crowd, you’re worth the whole damn bunch put to gether† you feel the same towards him because his love for Daisy was very important to him. He takes the blame for Daisy killing Myrtle even though he knows he can be taken away to jail for the rest of his life. There are people still today that will fight for their friends because friendship is vowed to be very important in the life of very human. As you can see the adult’s shown in the Great Gatsby (1920’s) are similar to the adults that live today. Many portray racism and are irresponsible; however they are also many who act with honesty, integrity and compassion. I believe the two generations are similar for the common traits they share. Because there is a century between these two generations many would believe that a lot of change has undergone but in reality not much change has happened. Everything around the people has changed but them as people have not.

Is Macbeth responsible for his own downfall Essay

Macbeth is completely and solely responsible for his own downfall. He lead himself to defeat by falling to his fatal flaws. Manipulation, ambition, and power got the better of him creating great inner turmoil, and bringing him to an abrupt end. From the beginning Macbeth was able to choose his own fate. The moment when he eagerly listened to the witches and said to them â€Å"Stay, you imperfect speakers, tell me more† shows that he believed that what they are saying was of great importance to him. The tempting words of the witches prophecies ignited a spark of greedy ambition in him that he had not realised was there. This lead him to make his decision to follow their persuasive words so although they tempted him, it was his own ambition that drove him to commit the crimes. Macbeth’s ambitious nature is shown many times throughout the play. Once the king had made him Thane of Cawdor and the first â€Å"and great† hurdle had been overcome, the possibility of him having crown becomes fixed in his mind.when he hears Malcolm has been pronounced as the king heir Macbeth admits to himself that he has â€Å"Black and Deep Desires†. He finds himself battling with his conscience but when he says  Ã¢â‚¬Å"I have no spur to prick the sides of my intent but only vaulting ambition, which o’erleapes itself and falls on the other†Ã‚  it shows that he has no reasons to kill the king except to fulfill his own ambition. Macbeth’s overly ambitious quest for power motivates him to prematurely end the life of the current king. Not only does Macbeth quest for power end the life of King Duncan, but he continues to murder for no reason whatsoever apart from malice. the evil tyrant that Macbeth has become is proved when he plans alone to murder Lady Macduff and her children. At this stage of the play Macbeth has lost all human compassion and empathy so he thinks nothing of murdering innocents. Had he stopped at the first murder of king Duncan he may have got away with it but his manic behaviour turns everyone against him and can ultimately  only lead to his own demise. By the end of the play it is obvious that a valiant Macbeth no longer exists. He suffered greatly from his fatal flaws: being mainly manipulability, ambition and the sense of power. Macbeth’s life comes to an abrupt end, and no one grieves him. He died a tyrant and a murderer, all through his own fault.

The Common Man’s Role in the American Revolution Essay

If you live in the United States, you probably are aware of the American Revolution. Most educated adults in America can name at least on hero of pre-Revolutionary America such as Samuel Adams, John Hancock, Paul Revere and Thomas Jefferson . But to what extent did these few men, credited with our freedom, actually participate in events that lead up to the revolution? How many countless men remained unnamed and unnoticed despite the work they put into the Revolution? These men have often been overlooked in textbooks, despite the fact most of the freedoms we have now are derived from their brave actions. But why did these men get the wheels of a revolution turning? What was the reason they had for their actions, the very ones that led†¦show more content†¦In about three hours from the time we went on board, we thus broken and thrown overboard every tea chest to be found in the ship; while those in other ships were disposing of the tea in the same way, at the same time. 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