The Effect of Temperature on Rate of Reaction Essay Example for Free

The Effect of Temperature on Rate of Reaction Essay In this experiment I shall be investigating how temperature affects the rate of reaction Rates of reaction The Factors that affect the rate of reaction are temperature, surface area, concentration, catalysts, light and pressure Surface area – Surface area is the amount of solid surface that is available for reaction Only affects solids so this will not affect our experiment When the surface area increases the rate of reaction increases as there is more surface area for the particles to work on, thus, there are more collisions per second Example : It is easier to light a fire with small pieces of stick than using large blocks of wood Concentration Concentration is the amount of molecules of a substance in a given volume Concentration affects solids, gases and liquid so this will affect our experiment When the concentration increases the rate of reaction increases as there are more molecules present, therefore there are more collisions between molecules (Collision theory) Example : zinc reacts fairly slowly with dilute hydrochloric acid but when the acid is concentrated, the rate of reaction increases. Catalysts A catalyst is a substance which speeds up the  rate of reaction without itself going undergoing any permanent chemical change – this means only small amounts of catalysts are needed to speed up reactions When a catalyst is involved in an experiment there is less energy needed for the reaction therefore there is more collisions per second We will not be using catalysts in our experiment Example : Decomposing hydrogen peroxide  solution at room temperature is very slow, but using a small amount of manganese oxide greatly increases the reaction rate and oxygen is given off rapidly Light Light is a form of energy and it causes many chemical reactions to take place. Light does not affect our experiment Example : Photosynthesis Temperature Collision theory is used to explain how different factors affect the rate of a chemical reaction. For a reaction to take place the reactant particles must collide with each other with adequate energy (activation energy), this energy is used to break the bonds between the particles. If the particles do not have enough energy they will bounce off each other without reacting. By increasing the temperature the particles gain more energy and move faster causing more collisions per second. 10oC 60oC Previous Experiments These previous experiments give us background information on rates of reaction: Acid and limestone CaCO3(s) + 2HCL(aq) CaCl2(aq) + H2O(l) + CO2(g) Apparatus – Conical flask, hydrochloric acid, marble chips, cotton wool and scales In this experiment we mix a certain mass of large marble chips with a certain volume of hydrochloric acid in a conical flask and use cotton wool to trap the acid spray. As the carbon dioxide is given off from the flask, the mixture loses mass, this is measured and recorded every minute until the reaction is over. The experiment is repeated again using the same mass of marble chips and the same volume of hydrochloric acid and the same temperature but instead using small marble chips. When we look at our results we find that the larger marble chips take more time to react than the smaller marble chips which show that as the surface area increases, the rate of reaction increases. Decomposition of hydrogen peroxide solution H2O2(aq) 2H2O(l) + O2(g) Apparatus – Conical flask, gas syringe, hydrogen peroxide solution and solid manganese oxide In this experiment we firstly measure the time taken for hydrogen peroxide to decompose and produce 50cm3 of oxygen at room temperature and without a catalyst. We use a gas syringe to measure the oxygen given off. Then we repeat the experiment but instead add a small amount of solid manganese oxide to the hydrogen peroxide solution. When we look at our results we find that without the catalyst (manganese oxide) the reaction is very slow, but when we add the catalyst the decomposition is very fast and oxygen is  rapidly given off which shows that catalysts increase the rate of reaction. Sodium thiosulphate and hydrochloric acid Na2S2O3(aq) + 2HCL(aq) 2NaCl(aq) + SO2(g) + S(s) + H2O(l) Apparatus – Sodium thiosulphate, hydrochloric acid, stop clock, a measuring cylinder and white paper with a black cross In this experiment we vary the concentration of the sodium thiosulphate, add it to a given volume of hydrochloric acid and time how long it takes for the mixture to go cloudy and the cross to disappear. When we look at our results we see that as we increase the concentration of sodium thiosulphate the rate of reaction increases. Hypothesis My prediction is, as the temperature of the reaction mixture increases so to will the rate of reaction as at higher temperatures the particles have more energy and will collide more hence increasing the rate of reaction. This is explained by the collision theory. The collision theory also allows me to predict that my time against temperature graph will have negative correlation as the time taken will decrease as the temperature increases. I also predict this graph will be curved as the time taken will not be directly proportional to the temperature. I also predict that as I increase the temperature of the mixture, the time taken for the cross to disappear will decrease. Reaction In my experiment I shall be investigating the effect of temperature on a reaction rate by reacting sodium thiosulphate in dilute hydrochloric acid as shown in the equation below Sodium + hydrochloric Sodium + Sulphur + Sulphur + Water thiosulphate acid chloride dioxide Na2S2O3 (aq) + 2HCL (aq) 2NaCl (aq)+ SO2 (g) + S (s) + H2O (l) Sodium thiosulphate is a clear liquid and hydrochloric acid is a clear liquid, when they react together the solution turns cloudy due to the sulphur. The reaction is exothermic as the energy required to break the bonds is less than the energy needed to make new bonds. Procedure Apparatus †¢ Conical flask †¢ Measuring cylinder †¢ Bunsen burner †¢ Thermometer †¢ Stop clock †¢ White paper with a black cross Method 1. Measure out 10 cm3 of sodium thiosulphate and 40cm3 of water into a flask. Measure out 5 cm3 of hydrochloric acid an a measuring cylinder 2. Heat the thiosulphate solution to the required temperature using a Bunsen burner 3. Add the acid and start the stop clock. Swirl the flask to mix the solutions and put the solution on the white paper with a black cross 4. Look down at the cross and stop the clock and note the time taken when the cross has disappeared. Record the temperature of the mixture in the flask. Variables The variables we will need to keep constant are †¢ The concentration of sodium thiosulphate †¢ The concentration of hydrochloric acid †¢ The volume of hydrochloric acid †¢ The same colour of cross †¢ The same thickness of cross †¢ Look at the cross from the same height The independent variable is the temperature. We will take 7 different recordings between 10o-70o We will do each recording 5 times and get an average to make sure the results are accurate. Results I will record my results in the table and make a time against temperature and a 1/time against temperature graph as shown below

U.S. Marshall Matt Dillon as the Ideal American :: American Culture Essays

U.S. Marshall Matt Dillon as the Ideal American The old-west lawman is an American hero and represents the ideals of American society. He is immediately thought of when one contemplates strength of character and other fine qualities. As an irreplaceable part of American tradition, his characteristics are looked upon as a model to all other Americans. Much of what is known about the old-west lawman comes from stories of fiction one of these being the radio program Gunsmoke. Matt Dillon, a U.S. Marshall, plays the lead role in this favorite American radio series. In each episode he beats the odds as he protects his home of Dodge City. Demonstrating the qualities of the old-west lawman, Matt Dillon, of Gunsmoke, is trusting, respectful, and courageous. Even with all that is bad in the world, Dillon is still quick to trust. Unlike so many others, who automatically believe the worst about people, Dillon easily trusts a persons word. In the episode Potato Road Dillon gives Budge the benefit of the doubt even though he seems a little fishy. In the episode Robber Bride Groom, Dillon allows Jack and Laura, both of whom he had arrested, to leave town, because he trusted that they would do what is right. To support Dillons judgment, the listener is given no reason to consider that Jack and Laura wont live up to Dillons expectations. Even when others arent willing to trust people, Dillon is there to defend. For example, in The Liar from Blackhawk Dillon justifies his trust in the gunman traveling through town by saying: Hes a paid gunman, but Ive never known him to lie. In Dillons eyes everyone is innocent until proven guilty. This trust allows others to trust Dillon - if he has trust in you, why shouldnt you have trust in him. Respect if something you must first give before one can receive it, and U.S. Marshal Matt Dillon lives by this principle. In Potato Road when Dillons sidekick, Chester, helps him save themselves and the town, Dillon is quick to give credit to Chester. Dillon himself is humble as he thanks Chester for his quick thinking and hard work. It could be considered easy to respect people who have just saved your life, however it shows trust strength of character to be respectful when someone is insulting you. Dillon displays this strength in Robber Bride Groom when Mr. Reeves demeans Dillon and his position as U.

Osmosis Reprot

OSMOSIS REPROT Introduction: Osmosis is the result of diffusion across a semi-permeable membrane. If two solutions of different concentration are separated by a semi-permeable membrane, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concentrated solution. This process is called osmosis. This leads me to my question, how do different concentrations of sucrose affect the rate of osmosis? My hypothesis is if sucrose concentration increases in the selectively-permeable baggies then, the rate of osmosis will also increase. Materials and Method: To conduct this experiment the materials needed are 3 different concentrated sucrose solutions, . 25 M, . 5 M, . 75 M. It will also require 4 beakers containing water from the sink. 4 pieces of dialysis tubing along with 8 pieces of string. An electronic balance to weigh the solutions. Makers and labeling type to label the different solutions. Paper towels needed to dry off any excess water. This experiment should be conducted in a group of 3. Step 1. Fill four separate beakers three-fourths full with deionized water. Step 2. Label the beakers to identify each different sucrose concentration later on. Step 3. Fill up the four baggies each with a different sucrose concentration, and the final bag fill up with deionized water. Step 4. Tie the bags with the string and rinse off each bag with di-H20 to wash away any spilt sugar. Step 5. Weigh the solutions to determine the bag weight and then wait 35 minutes and repeat the weigh-in to get the final weight of the solutions. Results: The initial weight gain was figured by weighing the baggie with the Sucrose solution before putting it into the beaker with the deionized water, and after the baggies were in the beaker of deionized water for 35 minutes, then the baggies were weighed again. After the initial weight and the final weight was done, the final weight was divided by the initial weight and multiplied by 100 to get percentage of initial weight gain. Sucrose Concentration (M)| Group 1| Group 2| Group 3| Group 4| Group 5| Group 6| Group Avg| 0| 100| 100| 100| 100| 100| 100| 100| . 25| 104| 106| 108| 102| 106| 108| 105. 6667| 0. 5| 110| 107| 112| 113| 110| 112| 110. 3733| 0. 75| 115| 99| 122| 120| 121| 119| 116| This is the table of the class raw data in % of initial weight gain. Discussion: The hypothesis that I made earlier if sucrose concentration increases in the selectively permeable baggies, then osmosis would increase with it, was validated by this experiment. Different concentrations of sucrose changed the rate of osmosis. The final weight prove to be a significant gain. The line graph shows the greater the concentration of sucrose in the solution, the greater the weight gain. The weight gain also increases directly with the increase of sucrose in the solution which demonstrates osmosis. Even though my hypothesis was proven correct, there could have been a few lab errors that might of threw the initial and final weight gain off by an insignificant number. The baggies may not have been filled up exactly half way and things of that nature. In any case, the experiment proved a success as we got to see osmosis taking place and results that occur from diffusion.

The Concept of Kami in the Shinto Religion - 704 Words

The concept of kami is integral to the Shinto religion. Kami doesn’t explicitly refer to gods, or an ethereal presence, but rather a combination of the two. For the layperson, kami is difficult to describe. In short, there are several ideas of kami—or rather—different interpretations of the same idea. Kami can be spirit beings, or they can refer to the qualities that a being possesses. In this sense, kami refers to existing beings, or the essence of beings. According to Shinto, everything has kami, but when something displays kami intensely—they are referred to kami beings. If kami refers to the quality that beings possess, then kami is responsible for its inherent nature. The concept of kami may be hard to grasp, mostly because humans are so anchored in this world, which makes us unable to grasp the ethereal quality of kami. For the purposes of this assignment, the function of kami as the godly beings in the Kojiki will be described. The events foretold in the Kojiki takes place during the Age of the Gods, which begins with Japanese creation mythology. Essentially, three grand deities spontaneously drift into existence. At this time, the land was premature, and had the shapeless quality of oil. From this formless mass, came several more beings—the most notable of which were Izanagi and Izanami. These two deities were given one divine command: â€Å"Complete and solidify this drifting land (Kojiki, p. 49)!† They stirred the oily mass with a spear, churned it around, and formedShow MoreRelatedThe Religions : Buddhism And Shinto1678 Words   |  7 Pagesformed. Religion is no exception; there have been many instances where religions have influenced each other and blossomed due to new ideas being presented. A good example of this the relationship between the two religions: Buddhism and Shinto. Buddhism was brought into Japan during the early 6th century from Korea, and was later institutionalized as the state religion in the late 6th century by Prince ShÃ… toku. The Prince was a great patron of Buddhism and by having ma de it the state religion, it wouldRead MoreSimilarities Between Shinto And Shinto Religion933 Words   |  4 PagesOf the many religions in the world, none are quite as unique as Shintoism. Shinto, meaning â€Å"the way of the kami†, is the indigenous religion of Japan. It is believed to have existed since the 6th century B.C.E. However, there is no documented origin nor is there an established founder. At the center of the Shinto religion is devotion toward various kami and the rituals performed to please them. It does not attempt to explain existence or the afterlife. Instead, Shintoism focuses on interactions withRead More Compare and Contrast Kami and Shen, the Japanese and Chinese Words for God1721 Words   |  7 PagesCompare and Contrast Kami and Shen, the Japanese and Chinese Words for God The words kami in Japanese and shen in Chinese both are translated into English as the word god. Although they both refer to somewhat similar supernatural elements, they are by no means identical to each other. Chinese shen is an abstract term referring to spirits and relating to abstract thoughts such as the heavens and the afterlife. In contrast, kami are very often related directly to a person or actual object andRead MoreHinduism, Buddhism, and Shinto1049 Words   |  5 PagesHinduism, Buddhism and Shinto, while vast in differences there is much to learn about these three religions similarities as well. Some facts and history of Hinduism include, Hinduism (being the oldest of the three) is dated back in pre-history before 10000 BC even believed to predate the Indus River Valley Civilization! The Vedas (the holy text of Hinduism) is the foundation for Indian culture and also the basic belief system of Hinduism. The basic belief structure of Hinduism is as follows, theRead MoreJap an Religion Essay1821 Words   |  8 Pages All around the world, religion is a dominant idea for many cultures; exemplifying a certain way of life, serving as a basis for faith, and bringing charity to the world, religion is a extensive concept. For several cultures and countries religion may vary according to demographics, socio-economical class, and ethnicity. Main concepts of religion in Japan are natural and superstitious based. The leading religion in Japan remains Shinto, while other religions have come and go, interweaving themselvesRead MoreHealth Care Provider and Faith Diversity1394 Words   |  6 Pagesvery popular religions this writer will discuss the spiritual perspective on healing, the critical components of healing, and what is important to people of a particular faith when cared for by health care providers. The three religions that will be discussed are Sikhism, Shintoism, and Buddhism. This writer will also compare these faiths to the Christian philosophy of f aith and healing. Health Care Provider and Faith Diversity The first of three religions that will beRead MoreThe Indigenous Religions Of The World1244 Words   |  5 PagesIndigenous Religions of the World Throughout the world there are many various religions, some very common to you and I. However, there are many religions that are common in several isolated places all around the world in Japan, Australia, and the Americas. Many of these religions, called Indigenous Religions are based on nature, and the earth. The practice of these religions is considered sacred to the people that follow them. Many of these indigenous people are fully sacrificed to their religion. TheyRead MoreDifferences Between Islam And Shinto1795 Words   |  8 Pagestheir core all religions are the same. They all follow a structure and share a basic concept of a something greater that can not be fully comprehended by the human mind. What makes them different is that way the religion is practiced and how each group interprets what they believe is the right way to live one’s life, by aspiring to live their similar to the particular religion’s founder or deity. To support my thesis statement, this paper will compare two of the world major religions that are supposedlyRead MoreEssay on Shinto Faith2127 Words   |  9 PagesShintoism is an ancient religion that originated in Japanese culture. Shinto is a general term for the activities of the people of Japanese descent to worship all the deities of heaven and earth, and at the end of the 6th century the Japanese were conscious of these activities and called them the Way of Kami (the deity or the deities). The practice of Shintoism finally recognized when Yomei, the 31st Emperor of Japan, prayed before an image of Buddha for the first time as an emperor for recoveryRead MoreThe Night Watches Of The Buddha1747 Words   |  7 PagesThis research will compare, contrast and exemplify the role of Chi in Daoism and Confucianism thought. Firstly, this research compares these two religion’s basic practice and to see both belief and practice. Then this research examines how both religions inte rpret the role of Chi and Confucianism thought. Both Taoism and Confucianism are originated in China and both visits in Temple to pay homage to their own deities and God (Diffen ). Firstly, Taoism seeks to be one with nature and stresses humanity