Glow Stick Experiment - Rate of Chemical Reaction

Glow Stick Experiment - Rate of Chemical Reaction Who doesnt love playing with glow sticks? Grab a pair and use them to examine how temperature affects the rate of chemical reactions. Its good science, plus its helpful information for when you want to make a glow stick last longer or glow more brightly. Glow Stick Experiment Materials 3 Glow sticks (the short ones are idea, but you can use any size)Glass of ice waterGlass of hot water   How To Do the Glow Stick Experiment Yes, you can just activate the glow sticks, put them in the glasses, and see what happens, but that wouldnt be an experiment. Apply the scientific method: Make observations. Activate the three glow sticks by snapping them to break the container inside the tube and allowing the chemicals to mix. Does the temperature of the tube change when it starts to glow? What color is the glow? Its a good idea to write down observations.Make a prediction. Youre going to leave one glow stick at room temperature, place one in a glass of ice water, and place the third in a glass of hot water. What do you think will happen?Conduct the experiment. Note what time it is, in case you want to time how long each glow stick lasts. Place one stick in the cold water, one in the hot water, and leave the other at room temperature. If you like, use a thermometer to record the three temperatures.Take data. Note how brightly each tube glows. Are they all the same brightness? Which tube glows the most brightly? Which is the dimmest? If you have time, see how long each tube glows. Did they all glow the same length of time? Which lasted the longest? Which stopped glowin g first? You can even do math, to see how much longer one tube lasted compared with the other. Once you have completed the experiment, examine the data. You can make a table showing how brightly each stick glowed and how long it lasted. These are your results.Draw a conclusion. What happened? Did the outcome of the experiment support your prediction? Why do you think the glow sticks reacted to temperature the way they did? Glow Sticks and the Rate of Chemical Reaction A glow stick is an example of chemiluminescence. This means luminescence or light is produced as the result of a chemical reaction. Several factors affect the rate of a chemical reaction, including temperature, concentration of reactants, and the presence of other chemicals. Spoiler alert: This section tells you what happened and why. Increasing temperature typically increases the rate of the chemical reaction. Increasing temperature speeds up the motion of molecules, so they are more likely to bump into each other and react. In the case of glow sticks, this means a hotter temperature will make the glow stick glow more brightly. However, a faster reaction means it reaches completion more quickly, so placing a glow stick in a hot environment will shorten how long it lasts. On the other hand, you can slow down the rate of a chemical reaction by lowering the temperature. If you chill a glow stick, it wont glow as brightly, but it will last much longer. You can use this information to help glow sticks last. When you are done with one, put it in the freezer to slow down its reaction. It may last until the next day, while a glow stick at room temperature would stop producing light. Are Glow Sticks Endothermic or Exothermic? Another experiment you can perform is to determine whether or not glow sticks are endothermic or exothermic. In other words, does the chemical reaction in a glow stick absorb heat (endothermic) or release heat (exothermic)? Its also possible the chemical reaction neither absorbs nor releases heat. You might assume that a glow stick releases heat because it releases energy in the form of light. To find out whether this is true, you need a sensitive thermometer. Measure the temperature of a glow stick before activating it. Measure the temperature once you crack the stick to start the chemical reaction. If the temperature increases, the reaction is exothermic. If it decreases, its endothermic. If you cant record a change, then the reaction is essentially neutral as far as thermal energy is concerned.

Representations of Women in Gothic Literature Essays

Representations of Women in Gothic Literature Essays Representations of Women in Gothic Literature Paper Representations of Women in Gothic Literature Paper Throughout the gothic genre, women are seemingly created on two extreme ends of the spectrum as either feeble and innocent victims or vindictive and lascivious predators. The Romantic poetry of Keats encapsulates this dualistic approach to the representation of women because on one hand he does create powerless and vulnerable women, but in order to highlight the decadence of the seventeenth century period of enlightenment, he eradicates the cold-hearted rationalism associated with patriarchy through the emergence of the Femme Fatale. Stoker wrote his epistolary novel, Dracula, amid the fin de siecle, a time period that was strictly governed by the stringent standards of the patriarchal, Victorian society. From the outset, Stoker challenges the rigid gender boundaries of society by making an explicit link between vampirism and sex, as his female characters adopt unconventional roles that appear to place them in positions of power, and in the process subvert the expectations of the Victorian society. Carter’s Bloody Chamber, written during the rebellious feminist era of the 1970’s, is arguably the most transgressive of all of the gothic texts on the basis that she does indeed explore the victimisation of women, but only does so as a means of highlighting the juxtaposing triumph of the female resurgence, as Kathleen E.B Manley asserts that her female protagonists â€Å"oscillate between passivity and action†. From the outset, each writer implies that the passivity which is traditionally associated with femininity is a direct result of the oppression from the patriarchal society. Keats conveys this idea through the objectification of women which is present in Isabella, as he notes that the brother’s plan was to â€Å"coax her by degreesTo some high noble and his olive trees†. Evidently, Keats is making reference to a proposed arranged marriage, thus exploring the way in which Isabella is a commodity to her brothers, with no active fre

Observation and Reaction assignment Essay Example | Topics and Well Written Essays - 250 words

Observation and Reaction assignment - Essay Example He found that discounting was the future of retail. This strategy led to the success of his business. Relating it to nursing, in order to gain positive patient outcomes, nurses and practitioners must be able to make strategic decisions that prove to be beneficial for patients in the long run (Sare & Ogilvie, 2010). Walton held the view that one should go the opposite way of the conventional methods to be successful. This strategy can be applied to gain patient outcomes by ignoring the traditional ways of dealing with patients and treating them the way others are not following, to make a unique niche. This will attract more patients, and will also improve the quality of health care. For example, under situations when nurses have to deal with drug addicts, they should focus more on their psychotherapy rather than traditional medicines. To conclude, Sam Walton’s leadership style and competencies should be applied in the field of nursing to gain quality patient outcomes. Nurses can use Walton’s strategic planning to improve the quality of services. They are also suggested to use Walton’s nontraditional style for treating