Kid-Friendly Elephant Toothpaste Demo

Kid-Friendly Elephant Toothpaste Demo The elephant toothpaste demo is one of the most popular chemistry demonstrations, in which a steaming tube of foam keeps erupting from its container, resembling a smooshed tube of elephant-sized toothpaste. The classic demo uses 30% hydrogen peroxide, which is not safe for kids, but there is a safe version of this demonstration that is still very cool. Materials Empty 20-ounce plastic bottle (or other container)3% hydrogen peroxide solution (available at nearly any store)Packet of active yeast (from the grocery store)Liquid dishwashing detergent (such as Dawnâ„ ¢)Warm waterFood coloring (optional, but it looks nice) Make Elephant Toothpaste Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you wont mind getting wet foam everywhere.In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about 5 minutes to activate before proceeding to the next step.When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast. How It Works Hydrogen peroxide (H2O2) is a reactive molecule that readily decomposes into water (H2O) and oxygen: 2H2O2 → 2H2O O2(g) In this demonstration, yeast catalyzes the decomposition so it proceeds much more rapidly than normal. Yeast need warm water to reproduce, so the reaction wont work as well if you use cold water (no reaction) or very hot water (which kills the yeast.) The dishwashing detergent captures the oxygen that is released, making foam. Food coloring can color the film of the bubbles so you get colored foam. In addition to being a nice example of a decomposition reaction and a catalyzed reaction, the elephant toothpaste demo is exothermic, so heat is produced. However, the reaction just makes the solution warmer, not hot enough to cause burns. Christmas Tree Elephant Toothpaste You can easily use the elephant toothpaste reaction as a holiday chemistry demonstration. Just add green food coloring to the peroxide and detergent mixture and pour the two solutions into a Christmas tree-shaped container. A good choice is an Erlenmeyer flask because it has a cone shape. If you dont have access to chemistry glassware, you can make a tree shape by inverting a funnel over a glass or making your own funnel using paper and tape (which you could decorate, if you like.) Comparing the Original Reaction With the Kid-Friendly Recipe The original elephant toothpaste reaction, which uses a much higher concentration of hydrogen peroxide, can cause both chemical burns and thermal burns. While it produces a larger amount of foam, its not safe for kids and should be performed only by an adult using proper safety gear. From a chemistry perspective, both reactions are similar, except the kid-safe version is catalyzed by yeast, while the original demonstration is usually catalyzed using potassium iodide (KI). The kids version uses chemicals that are safe for children to touch. The lower concentration of peroxide can still discolor fabrics. Care should be taken to avoid ingestion because the project includes detergent, which can cause vomiting. Key Takeaways The elephants toothpaste chemistry demonstration produces heated foam when chemicals are mixed.The original demonstration results from decomposition of hydrogen peroxide catalyzed by potassium iodide. Detergent solution captures gases to form the foam. The kid-friendly version uses a lower concentration of hydrogen peroxide, with the decomposition catalyzed by yeast.While both versions of the reaction may be performed for a young audience, the original version uses concentrated hydrogen peroxide, which is a strong oxidizer, and potassium iodide, which may not be readily available.The kid-friendly version uses chemicals that are safe for children to touch, in case of a splash.As with all chemistry demonstrations, adult supervision is recommended. Sources Dirren, Glen; Gilbert, George; Juergens, Frederick; Page, Philip; Ramette, Richard; Schreiner, Rodney; Scott, Earle; Testen, May; Williams, Lloyd. Chemical Demonstrations: A Handbook for Teachers of Chemistry. Vol. 1. University of Wisconsin Press, 1983, Madison, Wis.Elephants Toothpaste. University of Utah Chemistry Demonstrations. University of Utah.

Pride and Prejudice Study Guide

'Pride and Prejudice' Study Guide Pride and Prejudice is a novel by Jane Austen that satirizes issues of marriage and social class. It follows the relationship between the quick-to-judge Elizabeth Bennet and the haughty Mr. Darcy as both learn to mend their errors in judgment and look beyond markers of social status. First published in 1813, the bitingly funny romantic comedy has endured as both a popular favorite and a literary classic. Fast Facts: Pride and Prejudice Author: Jane AustenPublisher: Thomas Egerton, WhitehallYear Published: 1813Genre: Comedy of mannersType of Work: NovelOriginal Language: EnglishThemes: Love, marriage, pride, social class, wealth, prejudiceCharacters: Elizabeth Bennet, Fitzwilliam Darcy, Jane Bennet, Charles Bingley, George Wickham, Lydia Bennet, William CollinsNotable Adaptations: 1940 film, 1995 television miniseries (BBC), 2005 filmFun Fact: Researchers named a pheromone in male mice that attracts females â€Å"Darcin† after Mr. Darcy. Plot Summary Pride and Prejudice opens with the Bennet familys reaction to a bit of social news: the nearby Netherfield house has been leased to Mr. Bingley, a wealthy and single young man. Mrs. Bennet expresses the belief that Bingley will fall in love with one of her daughters. Her prediction proves true at the neighborhood ball, where Bingley and the sweet eldest Bennet daughter, Jane, fall in love at first sight. At the same ball, the strong-willed second daughter Elizabeth Bennet finds herself the object of disdain from Bingley’s arrogant, antisocial friend Darcy. Caroline Bingley and Mr. Darcy convince Mr. Bingley of Jane’s disinterest and separate the couple. Elizabeth’s distaste for Darcy only grows when she befriends Wickham, a young militiaman who claims that Darcy ruined his livelihood out of spite. Darcy expresses interest in Elizabeth, but Elizabeth harshly rejects Darcy’s self-absorbed proposal of marriage. The truth soon unravels. It is revealed that Wickham spent all the money Darcy’s father left him and then tried to seduce Darcy’s younger sister. During a trip with her aunt and uncle, Elizabeth visits Darcy’s estate, Pemberley, where she begins to view Darcy in a better light. Her positive impression of Darcy grows when she learns that he has secretly used his own money to convince Wickham to marry, rather than abandon, her sister Lydia Bennet. Darcys aunt, Lady Catherine, demands that Darcy marry her daughter, but her plan backfires and instead leads to Darcy and Elizabeth finding their romantic happiness alongside a reunited Jane and Bingley. Major Characters Elizabeth Bennet. The second of the five Bennet daughters, Elizabeth (â€Å"Lizzy†) is the story’s protagonist. Playful and intelligent, she prizes her ability to make judgments quickly. Her journey of self-discovery is at the heart of the story, as she learns how to discern the truth beneath first impressions. Fitzwilliam Darcy. Mr. Darcy is a haughty and wealthy landowner who snubs Elizabeth when they first meet. He is proud of his social status and is frustrated with his own attraction to Elizabeth but, like her, he learns to overcome his previous judgments to come to a truer perspective. Jane Bennet. The sweet, pretty eldest Bennet daughter. She falls in love with Charles Bingley, Her kind, nonjudgmental nature leads her to overlook Caroline Bingley’s malice until it is almost too late. Charles Bingley. Polite, open-hearted, and a little naà ¯ve, Bingley is a close friend of Darcy. He is easily influenced by Darcy’s opinions. He falls in love with Jane but is persuaded away from her, although he learns the truth in time to make amends. George Wickham. An outwardly charming soldier, Wickham’s pleasant demeanor hides a selfish, manipulative core. Though he presents himself as a victim of Darcy’s pride, he is revealed to be the problem himself. He continues his bad behavior by seducing young Lydia Bennet. Major Themes Love and Marriage. The novel focuses on the obstacles to, and the reasons for, romantic love. Most notably, it satirizes expectations about marriages of convenience and suggests that genuine compatibility and attraction- as well as honesty and respect- are the foundations of the best matches. Characters who try to subvert this thesis are the targets of the book’s biting satire. Pride. In the novel, uncontrolled pride is one of the biggest obstacles to the characters’ happiness. In particular, pride based on notions of class and status is framed as ridiculous and unfounded in real values. Prejudice. Making judgments about others can be useful, but not when those judgments are formed erroneously or quickly. The novel posits that overly confident prejudice must be overcome and tempered before the characters can reach happiness. Social Status. Austen famously satirizes the manners and obsessions of class distinctions. While none of the characters are socially mobile in the modern sense, obsessions with status are presented as foolish and arrogant. Wealth and inheritance do matter, though, as evidenced by Mr. Collins’ presence as Mr. Bennet’s heir. Literary Style Austen’s writing is famous for one particular literary device: free indirect discourse. Free indirect discourse is the technique of writing thoughts that seem to come from an individual characters mind, without shifting into first-person narration or using action tags such as she thought. This device gives readers access to inner thoughts and helps to solidify the characters’ unique voices. The novel was written in the Romantic period of literature, which was at its peak in the first half of the 19th century. The movement, which was a reaction against the onslaught of industrialism and rationalism, emphasized individuals and their emotions. Austen’s work fits into this framework to a degree, as it emphasizes decidedly non-industrial contexts and focuses primarily on the emotional lives of richly drawn individual characters. About the Author Born in 1775, Jane Austen is best known for her sharp observations of a small social circle: country gentry, with a few lower-tier military families in the mix. Her work prized the inner lives of women, featuring complicated characters who were flawed yet likable and whose internal conflicts were as important as their romantic entanglements. Austen shied away from over-sentimentality, preferring instead to mix heartfelt emotions with a helping of pointed wit.

The Success of the Management of Fork and Dagger Pub Essay - 33

The Success of the Management of Fork and Dagger Pub - Essay Example The fact that the business has existed for numerous years makes the renovations as proposed by Jason inevitable. Similarly, narrowing the business’ target market as proposed by Bradley would enhance its operations thus improving the profitability of the company. Mr. Lynch must, therefore, consider the possibility of consolidating the two approaches with the view of enhancing the longevity of the business and quelling the differences between his sons. Renovating the pub will place it in the modern society. The renovation will seek to satisfy the demands of the modern day customer. In renovating and expanding the pub, the management must consider the demands of the modern day customer thus safeguarding such features as convenient and comfortable. As stated earlier, renovating the pub is inevitable. This implies that Mr. Lynch and his two sons must determine the most appropriate ways of renovating the pub thus positioning the business strategy in the modern society. While doing this, the management must narrow the pub’s target market a feature that will enhance the management. In doing this, Mr. Lynch must consider the importance of diversity in enhancing the profitability and longevity of business in the contemporary market. In expanding and renovating the pub, Mr. Lynch can, therefore, develop a section of the pub and permit Bradley to customize it strategically for its LGBT target market. Jason should then manage the other section that targets the general consumer. This way, the business diversifies its services while safeguarding the peace and unity of the two siblings. Such is an appropriate approach that will serve as an effective marketing research and analysis tool that will provide the two sons with the most appropriate trends in the market thus enabling the two to change the structure of their business based on the response of the market.

Athletes psychological make- up Essay Example | Topics and Well Written Essays - 1250 words

Athletes psychological make- up - Essay Example From the above explanation, it is important to consider that there are numerous sports and in sense every sport would want a deliberately devised and developed in a peculiar way to address the need of the specific sports. This has been the point of concern and controversy as there is widespread adoption of information’s tailored for other sports to the unintended ones (Smith, & Kays 2010). There are issues now that the efficacy of the imported ideas and training designed for other related sports may work negatively if wrongly applied. In the contemporary sporting, sports psychology is of paramount interest and there is high need to determine the psychology of the participants so as to prepare them adequately for the games. With regard to this, testing the psychological status of the sportsmen has gained grounds and two methods have been coined to undertake to this. One of the approaches has been the unilateral application of the psychometric tests to understand the behavior o f the athletes. The second approach involves the use of construction, and effecting specific sports psychological test to gauge the psychological status of the sportsmen (Smith & Kays 2010). The application of the above named approaches have stirred great controversies as there are the opponent and proponents of the approaches, each holding to a contrary schools of thoughts. In other words, the approaches of determining the psychology of the sportsmen have attracted applause and rejection in equal measure (Smith & Kays 2010). Starting with the psychometric tests, the opponents of the

The Development Of Psychology As A Scientific Discipline Philosophy Essay

The Development Of Psychology As A Scientific Discipline Philosophy Essay One of the most notable figure in the development of psychology as a scientific discipline is RenÄâ€Å" Descartes, a French philosopher and mathematician. Descartes was most recognized as a proponent of dualism which supported the idea that all reality can be divided into two vivid and distinct entities: mind and matter. Descartes distinguished himself from other philosophers in that he proposed an existing link or interaction between mind and matter called interactionism. This was the key development in psychology as a scientific discipline because it led to two key principles in psychology introspectionism and behaviourism. Despite Descartes emphasis on the rationalism which is the pursuit of truth through the process of reasoning, John Locke, the British first empiricist, suggested that empiricism which involves the pursuit of truth through observation and experience is the preferred method of investigation. Being the pioneer to define self through a continuity of consciousness, Locke postulated that the mind was a blank slate of tabula rasa. Contrary to Descarts cartesian philosophy, he believed that we were born without innate idea and that the knowledge is instead measured only by experience derived from various sense perceptions. Yet, some of the information attained from our senses is subjective and non-trustworthy while some are objective and trustworthy. He put great emphasis upon the belief that our knowledge of complex experiences were made up from the links between simple and primary sensations. This idea was further developed by David Hume, a Scottish philosopher, known especially for his philosophical empiricism and scepticism. Yet, there was a slight difference from Lockes argument. While Locke wrote of innate ideas, Hume introduced the concept of perceptions which consisted of impressions and ideas and strove to develop a total naturalistic science of man that examined the human nature on a psychological basis. To Hume, impressions were the most important perceptions because they were derived directly from observations. He strongly believed that only empirically derived content are valuable and trustworthy. Thus, he developed positivism the philosophy of science rooted on the view that data derived from sensory experience and that logical and mathematical analysis of such data produce all authoritative knowledge. In contrast to the empiricists, George Berkely, an Anglo-Irish philosopher proposed that our knowledge comes from the inferences derived from experience through our senses instead of simply coming from direct experiences. His notable achievement of the advancement of the theory called immaterialism or subjective idealism which denies the existence of material substance. In contrast, this theory contends that objects are only ideas in the perceivers minds hence cannot exist without being perceived. A Scottish philosopher, Kames Mill then further developed on the idea and moved the focus from animism to materialism which is a belief that truth can be founded only after a thorough understanding of our physical world. The assumption that Mill insisted was that humans and animals were basically the same that both were entirely physical in their outer look and were totally subjected to the physical laws of the universe. Though agreed in essence with Descartes primary approach in understanding the human body, Mill was against the concept of an immaterial mind. Later on in the mid-1800s, a German physiologist, Wilhelm Wundt, used scientific research methods to investigate reaction times and his book, Principles of Physiological Psychology illustrated many of the main connections between the science of physiology and the study of humans thought and behaviour. The opening of the worlds first psychology lab at the University of Leipzig in 1879 marked the official beginning of psychology as a distinct scientific discipline. Wundt maintained that psychology is a study of humans consciousness and intended to apply as many experimental methods as possible to investigating and understanding internal mental processes. Though his use of introspection is seen as a non-trustable and non-scientific method today, his early work during the days helped to kick-start a stage for future experimental methods and hence was significant in the development of psychology as a scientific discipline. One of the Wundts most famous student, Edward B.Titchener went on to develop amd found psychologys first major school of thought and proposed the idea that human consciousness can be broken down into smaller parts via introspection. He was one of the most prominent structuralist. While structuralism was notable for its emphasis on science research, its methods were less convincing, unreliable, limiting and subjective. The concept essentially died when Titchener passed away in 1927. In response to structuralism, functionalism, an American perspective which was largely influenced by the work of William James and the evolutionary theory of Charles Darwin emerged. Functionalists sought for explanation for the mental processes in much systematic and accurate way. Instead of focussing on the elements of consciousness, they focussed on its purpose. This brings psychology a step closer to scientific discipline by placing great emphasis on systematic research method. In early 20th Century, another major school of thought known as behaviourism rose to dominance. It was a significant change from the past theoretical views. In fact, it was aimed to transform psychology into a much scientific discipline by solely emphasising on observable behaviour. It was started by Ivan Pavlov and two of the strongest advocates were John B.Watson and B.F. Skinner. However, behaviourism does not encourage scientific psychology. Among all, the concept of empiricism developed by philosophers John Locke and David Hume was the most significant leap in the development of psychology as a scientific discipline.

Rainy Days

Rainy Days Essay By Taylor Chance 11/20/13 Rainy days are wonderful to me. Sometimes they can be a hassle but I still love them. The only time I usually have rainy days is when it is July though. Rainy days are awesome to me sense I can do a lot of things in my own house. The reasons why I like rainy days mainly is because I can sing, listen to music, relax, and eat comforting food. First of all, the reason I like rainy days is because I love to sing.During my rainy days sense the air is usually moist and the temperature is usually cold, it is my favorite time to practice. The climate actually helps my voice by making it very moist instead of dry. If I sing with a dry throat, it will damage my vocal chords and it would also damage my tonsils since I would be straining my voice. So I like to play it on the safe side and practice the most on rainy days. Nonetheless, I love to listen to music on rainy days. I mostly listen to sad or calm music because it relaxes me and brings out my emo tions.It gets even better when I look out the window and I see the gloomy, wispy, and foggy roads and the grasshoppers, birds, and squirrels take cover under big, green trees or leaves with dew from the rain on them as I see the whitish, greyish rain splatter all over the place. My favorite song that I like to listen to most is called â€Å"How to Avoid the Sun† by Bi Rain; it is one of the most beautiful songs I’ve heard or at least one of the nicest songs I’ve listened to.Music also makes me realize new things and wonder about the world especially when it is raining. Another reason is that I love to relax during rainy days. Hearing the pitter patter of the raindrops going on the ground while there is loud thunder as little cool, white or yellow strikes in the sky that looks like a crack in the dark, grey clouds called lightening flash all over the place. I could just flop down on my bed and cuddle under my warm, soft blankets to be nice, cozy, and comfy.Anothe r thing I like to do is take a nap to the sounds of the rain or daydream. It makes me feel like it is winter or something because the cold temperature also relaxes me. Finally, the last reason I love rainy days is because I can eat as much fattening food as I want. Ice cream, hot chocolate, tea, you name it and I will eat it. Eating is one of my favorite things to do even though I do not eat a lot. These are my comfort foods during rainy days to also help me relax.The taste of the creamy, doughy ice cream tickles my taste buds and gives me a brain freeze sense I eat too fast because cookie dough ice cream is my favorite; the hot chocolate is sweet, warm, and it’s warmth makes me feel nice and cozy; and my tea is one of my favorites even though it is healthy. I usually drink tea warm and unsweetened because I try to stay skinny at the same time and my favorite tea is either Darjeeling or Tao: lemon grass and green tea but, these are the reasons why I love rainy days.

Government Control Essay - 635 Words

Any government with total control is worth being feared and having a group of individuals who go against their government. With complete control, a government is capable of committing acts against their citizens, which can be perceived as â€Å"something good† from the government’s point of view. In 1984 by George Orwell, and â€Å"Harrison Bergeron†, by Kurt Vonnegut, the main characters, Winston and Harrison, feel oppressed by the governments acts and events, try to overthrow their government, and go through a realization of hopelessness and defeat. With complete control, a government is capable of committing acts against their citizens, which can be perceived as â€Å"something good† from the government’s point of view. Winston Smith feels†¦show more content†¦The mental and physical handicaps he wore gave him headaches and left him half blind. This is why Harrison began to go against his government. Both Winston and Harrison decided to go rebel against their governments and against the government’s thoughts and ways. As a result, Winston’s and Harrison’s actions led to greater acts of rebellion. Winston began affair with Julia and he began to study the work of the Brotherhood leader, Emmanuel Goldstein (Orwell, 151). Winston believed that he would have to study this to become a member of the infamous Brotherhood. The Brotherhood is the secret, anti-government organization that Winston felt he needed to be a part of. He believed that this would be the ultimate action against The Party. Harrison didn’t need a group or secret organization to rebel against the government. His size gave him an advantage to escape prison (Vonnegut, 24). Harrison escaped from prison to show everyone he isn’t afraid of his government. He went on television to show everyone that he is a greater ruler than any man who ever lived. Winston and Harrison didn’t really recognize how deep they were invol ved against their government. Consequently, both Winston’s and Harrison’s actions had severe penalties. Winston and Julia were caught by the Thought Police with Goldstein’s work and they were taken to the Ministry of Love to be severely tortured for their actions (Orwell, 185). Even though they knew theShow MoreRelatedGovernment Control And Procedural Guarantees871 Words   |  4 Pages1. Regulated capitalism is private ownership with some government control and procedural guarantees. While social democracy is mostly private ownership but extensive government control with substantive and procedural guarantees. An example of how the government regulates an aspect of our economy is the FDA. In a regulated capitalism the owner of a cupcake industry owns the factory but has regulations it must meet according to the FDA. 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Although the federal government has not done much and does not seem to be doing anything any time soon, the states have huge potential to start the change. State governments can decide what laws can be passed and how serious their guns laws will and should be. Since the rise of mass shootings in schoolsRead MoreApproaches to Government Control on Expenditure1323 Words   |  5 Pages1. INTRODUCTION Money is central to the functioning of a government, revenue is generated by the imposition of taxes and the money received is then spent by the Commonwealth subject to appropriation. The scope of the governments’ capacity to spend public moneys has been a controversial issue for many years, due to the uncertainty surrounding the scope of the spending power. This essay will determine which approach to Government’s control on expenditure is more favourable; the narrow approach, where