How to Do the Color Change Chameleon Chemistry Demonstration

How to Do the Color Change Chameleon Chemistry Demonstration The chemical chameleon is a wonderful color-change chemistry demonstration that may be used to illustrate redox reactions. The color change runs from purple to blue to green to orange-yellow and finally to clear. Color Change Chameleon Materials For this demonstration, you start by preparing two separate solutions: Solution A 2 mg potassium permanganate500 ml distilled water Dissolve a small amount of potassium permanganate into water. The amount isnt critical, but dont use too much or else the solution will be too deeply colored to see the color changes. Use distilled water rather than tap water to avoid problems caused by salts in tap water that affect water pH and can interfere with the reaction. The solution should be a deep purple color. Solution B 6 g sugar (sucrose)10 g sodium hydroxide (NaOH)750 ml distilled water Dissolve the sugar and sodium hydroxide in the water. The reaction between sodium hydroxide and water is exothermic, so expect some heat to be produced. This will be a clear solution. Make the Chameleon Change Colors When youre ready to start the demonstration, all you need to do is mix the two solutions together. Youll get the most dramatic effect if you swirl the mixture together to thoroughly combine the reactants. Upon mixing, the purple of the potassium permanganate solution immediately changes to blue. It changes to green fairly quickly, but it takes a few minutes for the next color change to pale orange-yellow, as manganese dioxide (MnO2) precipitates. If you let the solution sit long enough, the manganese dioxide will sink to the bottom of the flask, leaving you with a clear liquid. Chemical Chameleon Redox Reaction The color changes are the result oxidation and reduction or a redox reaction. The potassium permanganate is reduced (gains electrons), while the sugar is oxidized (loses electrons). This occurs in two steps. First, the permanangate ion (purple in solution) is reduced to form the manganate ion (green in solution): MnO4- e- → MnO42- As the reaction is proceeding, both the purple permanganate and green manganate are present, blending together to produce a solution that appears blue. Eventually, there is more green manganate, yielding a green solution. Next, the green manganate ion is further reduced and forms manganese dioxide: MnO42- 2 H2O 2 e- → MnO2 4 OH- Manganese dioxide is golden brown solid, but the particles are so small they make the solution appear to change color. Eventually, the particles will settle out of solution, leaving it clear. The chameleon demonstration is just one of many possible color change chemistry experiments you can perform. If you dont have the materials on hand for this particular demonstration, consider trying a different one. Safety Information Sucrose and distilled water are safe and non-toxic. However, appropriate safety gear (lab coat, safety goggles, gloves) should be worn when preparing the solutions and performing the demonstration. Sodium hydroxide and potassium permanganate can cause irritation and chemical burns in contact with skin or mucous membranes. The chemical solutions must be labelled and kept away from children and pets to avoid accidental ingestion. Potassium permanganate is highly toxic to aquatic organisms. In some places, pouring a small quantity of a solution down the drain is allowed. The reader is advised to consult federal, state, and local regulations for proper disposal. Fast Facts: Chemical Chameleon Science Experiment Materials Potassium permanganateSucrose (table sugar)Sodium hydroxideDistilled Water Concepts Illustrated This demonstration is a good example of an exothermic reaction. The color change is produced via a redox (oxidation-reduction) reaction. Time Required The two chemical solutions may be prepared in advance, so this demonstration is instantaneous. Level The demonstration is suitable for all age groups. High school and college chemistry students studying redox reactions will get the most out of the experiment, but it can be used to stimulate interest in chemistry and science at any age. The demonstration may be performed by any high school or college chemistry teacher. Because there are safety protocols for using potassium permanganate and sodium hydroxide, this demonstration is not suitable for unsupervised children.

In finance, risk is best judged in a portfolio context. Is this true Essay - 7

In finance, risk is best judged in a portfolio context. Is this true Why - Essay Example This paper takes an argument to prove that individual stock cannot allow investors to help judging the overall risk associated with investment on shares. A critical criticism context will also be introduced in the paper later on to justify the argument regarding risk being judged better in a portfolio of stocks. It will not be incorrect to state that investors of stock market are directly associated with the risk which is not avoidable. These risks can be variable in types such as short-term risk or portfolio risk. For the focus of this paper, portfolio risk is being discussed in a contextual manner. It should be noted that portfolio risk is relatively low in accordance to the movements within the stock market. Herein, the process or concept of aggregation is considered for calculating risk associated with an asset or for valuing a company. It is due to this reason that individual investors are suggested to manage their portfolio risk because their individual transactions are aggregated. This denotes that investors tend to diversify their assets in order to judge the risk of security (Brealey, et al., 2010). It is not being proven here that by taking an aggregate of the risk of in a portfolio can eliminate risk. Portfolio of stock allows the investors to understand the associated risk in accordance of variation in all levels of the market. There is an underlying condition associated with portfolio risk. As a matter of fact, risk can be best judged in a portfolio context, as diversified stocks can have reduced risk. The underlying condition is that the return which is received by the investors is less than one. In this case, it is stated that diversification will remain beneficial or the investors (Brealey, et al., 2010). Risk or systematic risk is interlinked with the changes that may occur in the market. The risk is

Law of Equity and Trusts Essay Example | Topics and Well Written Essays - 1000 words - 1

Law of Equity and Trusts - Essay Example The first determination of the presence of a trust is with regards to a written declaration of it. There is no written declaration for the purposes of s. 53(1)(b) of the Law of Property Act (LPA) 1925 with regards to the home. The only written declaration of the trust is Uncle David’s Will. Thus, if Lorraine has to establish an interest, it must be under the rules ofPettitt v Pettitt(1970) later affirmed by Lloyds Bank v Rosset(1991), by way of resulting or constructive trust. This would result in an equitable interest for Lorraine. Resulting trusts are formed when there is a contribution made to the purchase price, which, in this scenario is not the case.The facts do not say whether she actually contributed to the purchase price by way of outright sum or through mortgage payments, both of which are accepted ways of establishing an interest in the house, and thus, it is presumed that Jonathan was the sole proprietor of the house. Lorraine joined him as a young girlfriend, and for that reason, her interest has to be established by way of constructive trust, which is formed in the presence of an oral assurance on which reliance has been made by the claimant to her detriment (see Lloyds Bank). The promise made by Jonathan can be easily evidenced as it was in the presence of witnesses. In 2009, he declared, â€Å"all of my property including our lovely barge home is as much yours Lorraine as it is mine†. This takes the form of an oral promise, and judging from the fact that it was made on several occasions, Lorraine can establish that it amounts to an interest of some kind in the property (Ungarian v Lesnoff (1990) and Eves v Eves (1975)). Thus, the second step for Lorraine in order to establish her equitable interest in the property would be to prove that she relied upon the promise to her detriment. Lorraine spent a considerable amount on structural repairs and decoration, to the tune of 65000 pounds and contributed half of her salary to

Every Man Dies but Not Every Man Really Lives Essay Example for Free

Every Man Dies but Not Every Man Really Lives Essay â€Å"Every man dies but not every man really lives† was among the few words written by Sir William Ross Wallace, an American poet during the 1860s. Well, as for me I want to live my life to the fullest before I leave to my eternal home up there. Having a bucket list simply keeps me on track to full fill every minor and major thing I want to do before I kick the bucket. The very first item on my list is to tell my mother that I love her. I believe in love at first sight because since the very first day I opened my eyes until to this very second, I still love my mom. My mom is my best friend and my hero because she has been with me through my laughs, heart breaks, tears and everything that came in between. Since babies are precious angels gifted from heaven, I would not want to miss the next thing on my list which is to make a baby laugh. That moment of being so satisfied upon witnessing the joy on their faces is a feeling of no value. Next, I want to make a difference in a beggar’s life by taking some incredibly small steps which will mean so much to them some day. Back to the olden days blockbuster ‘Dr No’, right up to ‘Casino Royale’ that hit the box office in year 2006 will be one of the thing I want to do which is to watch all of James Bond’s movies. Just like how Alex Thompson wrote a poem entitled ‘My First Time’ to share his experience milking a cow, I want to roam freely and spend one week of my life to learn how to milk a cow. Besides that, I want to go on a holiday with no luggage to add a little more spice to the memories I will take back. The ‘Steel Dragon’ roller coaster in Spaland located in Nagashima, Japan will be one thrilling ride I would not want to miss. To add more excitement, I will pay the risk to swim with a shark and to swing myself in the sky on a trapeze. Besides that, one thing I will definitely do is to push a policeman down the street and run away. To appreciate mother-nature and the greens that provided me sufficient oxygen to respire, I will plant a tree with my name carved on it. Among the crazy things that I do not want to miss to do is to pretend to be invisible just like drawing a picture using a white crayon on a white paper. From laughing at a public phone to confessing my love to a traffic light, I wish to do all kind of things that will make people think I just lost my mind for one simple reason that I wish to relate to the sayings of Mahatma Gandhi, ‘Live every moment of your life as if there is no tomorrow and as if there is no one watching’. Among the few last things I will do is to fall in love. Somewhere between laughing for no reason, stupid arguments, and making fun of each other, I will fall for the ‘him’ who is willing to catch me when I fall. Elvis Presley put it best in his classic love songs and I want to fall in love with no regrets. I want to be in love with a love that is nothing because nothing last forever and therefore my love will last forever. With commitments, trust and care I want to fell so alive to be in love with the right man. Finally, I will prepare letters and leave it to cope up with my loved one once I am gone just like how Gerard Butler did to Hilary Swank in the movie, ‘P.S. I Love You’. ‘As a well-spent day brings happy sleep, so a life well used brings happy death’ said by Leonardo da Vinci is the one thing that keeps me going and to stand up to live every day of my live doing things I want to do by simply being just the way I am.

J.K. Rowling’s Harry Potter is NOT Sexually Biased Essay -- J.K. Rowli

J.K. Rowling’s Harry Potter is NOT Sexually Biased J.K. Rowling’s blockbuster Harry Potter series contains mystery, suspense, compelling language and colorful imagery, magical feats, and real life concerns. These books have managed to get children of all ages reading in a society dominated by computers, television, and videos. However, there have been several critics that claim these books are sexually biased. From the beginning of the first Potter book, it is boys and men, wizards and sorcerers, who dominate the scenes and determine the action. This alone does not make these books sexually biased. Christine Schoefer, a freelance writer and concerned parent of three female Harry Potter fans, dissected the books in a brief piece for Salon on January 12, 2000. She claimed that the books are a â€Å"fictional realm of magic and wizardry that perfectly mirrors the conventional assumption that men do and should run the world† (Schoefer). J.K. Rowling did not attempt to portray the world as dominated by men. It is true that the Potter books contain more males. So what? Gi...

Singin in the Rain

Jenna Zeringo Singin’ in the Rain In 1952 Gene Kelly and Stanley Donen directed MGM’s musical comedy â€Å"Singin’ in the Rain†. Fifty five years later in 2007 it ranked number five on the American Film Institute list of â€Å"List of Greatest Films†. It’s evocative to Americans and is generally considered the best Hollywood musical film; it was not a Broadway production until several years later. Gene Kelly not only directed the classic but he also choreographed and starred in it as Don Lockwood. Debbie Reynolds played the part of Lockwood’s love interest Kathy Selden. Major roles included Donald O’Connor as Gene’s best friend and pianist Cosmo Brown and Jean Hagen as Lina Lamont. Based in 1920’s before sound was available to moving pictures the basis of the romantic musical comedy was about turning a film into a â€Å"talkie†, essentially a film with sound. Don Lockwood plays opposite Lina Lamont in the big screen, but her harsh tacky articulation just didn’t cut it in the recording booth. Kathy Selden, a chorus girl Lockwood met in two extraordinary instances is given the chance to dub over Lina with her singing voice and in secret make a musical. Lockwood and Kathy eventually fall in love. There are many elements that brought this film together. The musical aspect of the era it was produced was said to be cheerful, delightful and light hearted. Songs ranging from titles like â€Å"Make ‘Em Laugh† to â€Å"Moses Supposes† to â€Å"Singin’ in the Rain†. The songs also went hand in hand with the dancing. The tap dancing style choreography with the elements of real life tie in an amusingly â€Å"harder than it looks† way. When Gene Kelly is actually singing in the rain it seems like there’s a monsoon pouring on his elaborate footwork. There is also a slapstick comedy portrayed throughout the movie, physical sense of humor, and playful jesting. All of these elements transpired the picture to be as famous and well liked as it was and still is. It has all of the things an audience interested in musicals wants. It shows fun in secrets, romance, portrayed as hard to get, sly humor and witty jokes. All with such enthusiasm. Even today pop culture refers to it in formality and humor. Ultimately it is the most famous musical of Hollywood and will remain that way, because it’s classic.

What Makes A Successful School Base Mentor Program

The research offers vital characteristics to sub-question I: What it takes to create a successful school-base mentor program? First, it must take into consideration the need for a leadership, encouraged program. A school-based mentoring program must have a logical model theory that states, and encourages positive actions and outcomes. A clear mission, with goals, and an exit plan is needed. Internal and external factors will influence the program’s effectiveness and they need to be taken into consideration when building a model program. The end goal for a school-based mentoring program is to achieve meaningful and measurable results. It is important to establish, who is eligible to participate in the mentoring program. Due to the logistics of a school-based mentoring program, it is easier to target the participants and one most have am effective plan to entice students to partake in the program. One of the best strengths of a school-based mentoring program is to have a variety of activities and to also change the venue for example social gathering like bowling or the movies. Another, key element is involvement in the community, possible providing support for a cause to develop and boarder social skills. Mentoring programs need to deliver their message and activities in original and motivational way, making adjustments to insure the most effective outcomes. The conceptual design of a school-based mentor should bring about change. Academic and social changes in theShow MoreRelatedIntroduction: The present research would seek to expand upon the current research base of mentor1300 Words   |  6 Pagesthe current research base of mentor programs. Having an adult mentor is one of the greatest predictors of whether as student with finish high school, but more is information is needed. 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