How to Perform the Instant Fire Chemistry Demonstration

How to Perform the Instant Fire Chemistry Demonstration Heres a simple fire chemistry demonstration that produces instant fire without using matches or any other type of flame. Potassium chlorate and ordinary table sugar are combined. When a drop of sulfuric acid is added, a reaction is catalyzed which produces heat, an amazing bright/tall purple flame, and a lot of smoke. Instant Fire Materials Potassium chloratePowdered (confectioners) sugar or table sugar (sucrose)Sulfuric acidSmall glass jar or  test tube Procedure Mix  equal parts potassium chlorate and table sugar (sucrose) in a small glass jar or test tube. Choose a container you dont value, as the demonstration will probably cause it to shatter.Place the mixture in a fume hood and equip lab safety gear (which you should be wearing anyway). To initiate the reaction, carefully add a drop or two of sulfuric acid to the powdered mixture. The mixture will burst into a tall purple flame, accompanied by heat and a lot of smoke.How it works: potassium chlorate (KClO3) is a powerful oxidizer, used in matches and fireworks. Sucrose is an easy-to-oxidize energy source. When sulfuric acid is introduced, potassium chlorate decomposes to produce oxygen:2KClO3(s) heat - 2KCl(s) 3O2(g)The sugar burns in the presence of oxygen. The flame is purple from the heating of the potassium (similar to a flame test). Tips Perform this demonstration in a fume hood, as a considerable quantity of smoke will be produced. Alternatively, perform this demonstration outdoors.Granulated table sugar is preferable to powdered sugar which is, in turn, preferable to reagent grade sucrose. The powdered sugar is capable of smothering the fire, while the granules of the reagent-grade sucrose may be too large to support a ​good reaction.Follow proper safety precautions. Do not store the potassium chlorate and sugar mixture, as it can react spontaneously. Use care when removing the potassium chlorate from its container, to avoid sparking, which can ignite the container. Wear the usual protective gear when performing this reaction (goggles, lab coat, etc.).The Dancing Gummi Bear is a variation on this demonstration. Here, a small quantity of potassium chlorate is carefully heated in a large test tube, clamped to a ring stand over a flame, until it has melted. A Gummi Bear candy is added to the container, resultin g in a vigorous reaction. The bear dances amidst bright purple flames.

Spanish Punctuation Rules for Beginners

Spanish Punctuation Rules for Beginners Spanish and English are similar enough in their punctuation that a beginner might look at something in Spanish and not notice anything unusual except for a few upside-down question marks or exclamation points. However, there are a few differences, some of them subtle, in the way the two languages are punctuated. Questions and Exclamations As already mentioned, the most common difference is the use of inverted question marks and exclamation points, a feature that is almost unique to Spanish. (Galician, a minority language of Spain and Portugal, also uses them.) The inverted punctuation is used at the beginning of questions and exclamations. They should be used within a sentence if only part of the sentence contains the question or exclamation.  ¡Quà © sorpresa! (What a surprise!) ¿Quieres ir? (Do you want to go?)Vas al supermercado,  ¿no? (Youre going to the supermarket, arent you?)No va  ¡maldito sea! (Hes not going, darn it!) Dialogue Dashes Another difference youre likely to see often is the use of a dash - such as the ones separating this clause from the rest of the sentence - to indicate the beginning of dialogue. The dash is also used to end dialogue within a paragraph or to indicate a change in speaker, although none is needed at the end of dialogue if the end comes at the end of a paragraph. It isnt necessary to start a new paragraph with a change in speaker as is customary in English. These dashes are used by many writers instead of quotation marks, although the use of quotation marks isnt uncommon. Less common still is the use of angular quotation marks, which find more use in Spain than Latin America. -  ¿Vas al supermercado?- le preguntà ³. - No sà ©. (Are you going to the store? he asked her.  ¶I dont know.) Punctuation Within Numbers A third difference youll see in writing from Spanish-speaking countries is that comma and period usage in numbers is reversed from what it is in English; in other words, Spanish uses a decimal comma. For example, 12,345.67 in English becomes 12.345,67 in Spanish, and $89.10 becomes $89,10. Publications in Mexico and Puerto Rico, however, generally use the same number style as is used in the United States. Other less common or less significant differences in punctuation between Spanish and English are detailed in a more advanced lesson on punctuation.

Analysis three macroeconomic factors in the UK and how do they affect Essay

Analysis three macroeconomic factors in the UK and how do they affect the profitability of Sainsbury company - Essay Example It can be stated that the GDP growth will positively impact towards improving the profitability of Sainsbury’s. GDP also positively impacts upon public spending which is a crucial aspect for a retail organisation such as Sainsbury’s as it can enable them to garner more profit. Though, slower growth of GDP can create unemployment, which can in turn affect Sainsbury’s profitability as new recruitment can be stopped by the organisation along with investing in any new purchases until the economy gets better (Economy Watch, 2009). Interest Rate and Inflation Rate UK interest rate in March’ 2011 had been registered at 0.5% which is a record low (BBC, 2011). In February 2011, inflation rate of UK rose to 4.4% (BBC, 2011). Interest rate has a major impact on time value of money. Changes in case of inflation rate generally result in alterations in the interest rate. These two factors are the key decision making factors for making any investment decision since these factors have a straight impact upon the ‘investment yield’. In case of the UK, the record low interest rate will support the investment on shares. Rising interest rates slows down the inflation.