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Here's a fun chemistry demonstration that's perfect for Valentine's Day or to illustrate an oxidation-reduction reaction. The Vanishing Valentine involves shaking a solution, causing it to turn pink. If the pink Valentine solution is left undisturbed, it will become colorless. The color change cycle can be repeated several times. It is caused by the oxidation and reduction of resazurin. an indicator that is pink or colorless depending on its oxidation state. Vanishing Valentine Materials 100 ml of a 0.133 M dextrose solution (C 6 H 12 O 6 ) 100 ml of a 1.0 M sodium hydroxide solution (NaOH) 1 ml of a 0.1% resazurin solution a 250-ml or 500 ml Erlenmeyer flask or separatory funnel (resembles a heart) stopper for the flask dropper or pipette Prepare the Solutions Dextrose Solution: Dissolve 2.4 g of dextrose in distilled or deionized water to make 100 ml of solution. Sodium Hydroxide Solution: Prepare the 1.0 M sodium hydroxide solution by dissolvin...

February 13 th is Étienne François Geoffroy's birthday. Geoffroy was a French physician and chemist who was the first to arrange the known elements into a table based on their chemical affinity to each other. Anyone who has ever mixed two items together knows some things combine better than others. In chemistry, two different chemical species' affinity is a property that shows how likely a chemical reaction will occur when mixed. Reagents with strong affinity are more likely to react with each other than reagents with little affinity to each other. Geoffroy's table had a series of reagents across the top with other reagents with high affinity with these elements listed below. This table became a standard table for 18th Century chemists until the end of the century when it was shown the amount of a reagent drove the reaction.

The other day I got frozen tiny shrimp to feed the jellyfish and pipefish in my aquarium. I used my fingers to drop a pinchful of shrimp into the water, which worked great except I smelled like I just got off a shrimp boat. Soap didn't touch the stink. Neither did stainless steel . So, I decided to Febreze myself. It worked great. Initially I smelled like flowers instead of shrimp, but the floral smell washed off, leaving my hands unscented. Have you wondered whether Febreze actually removes odors or whether it just covers them with a perfume? Have you wondered how it works? Here's the lowdown on Febreze . It's a product that was invented by Procter & Gamble and introduced in 1996. The active ingredient in Febreze is beta-cyclodextrin, a carbohydrate. Beta-cyclodextrin is an 8-sugar ringed molecule that is formed via an enzymatic conversion of starch. The cyclodextrin molecule sort of resembles a donut. When you spray Febreze, the water in the product ...

Romance is all about chemistry, right? Valentine's Day is February 14th, so you've still got time to find a great gift for your sweetie and impress him or her with your holiday knowledge. Here's some Valentine's Day chemistry content to help you out: Vanishing Valentine Demo - Make a chemical solution go from blue to pink to clear. Hot and Cold Valentine - A chemical solution goes from colorless to hot pink! Crystal Heart - Grow a crystal heart as a decoration or gift.

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February 6 th marks the passing of Joseph Priestley. Priestley was an English theologian and natural philosopher who is best known with this experimental works with gases or "airs". He was the first to identify several gases including the element oxygen. This discovery helped answer the old question: Why do things burn? The prevailing theory of the time held there was a substance present in all things called phlogiston. Things would burn until they become saturated with phlogiston and any fire would go out. Priestley's found his new air greatly increased the process of burning and called it "dephlogisticated air" since it appeared to contain no phlogiston. Even though his discovery seemed to support the phlogiston theory, it was one of the key elements to launch Lavoisier's chemical reaction theories that started the Chemical revolution of the 19 th Century. Priestley began his work with gases with a ready supply of phlogistated air, or carb...

One common chemistry homework assignment is finding atomic mass. The atomic mass is the sum of the masses of the protons, neutrons, and electrons in an atom, but the electrons have so much less mass than the protons and neutrons that they are left out of the calculations. Atomic mass thus becomes the sum of the mass of an atom's protons and neutrons. It's not difficult to find atomic mass, but there are three types of problems you may be asked to perform, depending how advanced your class is. Here's a look at how to find atomic mass, no matter how the problem is presented.