Christmas Tree Elephant Toothpaste Chemistry Demo

Christmas Tree Elephant Toothpaste Chemistry Demo Did you know you can do the elephant toothpaste demonstration to make a Christmas tree holiday chemistry demonstration? Its extremely easy, plus it makes an excellent demo to do before the  holiday break! Christmas Tree Elephant Toothpaste Materials There are a few ways to set this up to make a Christmas tree. The key is to add green food coloring to get the tree effect and then either perform the demonstration in an erlenmeyer flask, which naturally produces the tree shape, or else perform the reaction in a tube with a tree template placed over it. You can make a tree shape from aluminum foil, with slots cut up the side and an opening at the top to force the foam from the reaction out into the proper shape. 50 ml of detergent100 ml of 30% hydrogen peroxide10 ml of a saturated solution of potassium iodidegreen food coloringerlenmeyer flask or homemade Christmas tree model Procedure Place the erlenmeyer or your Christmas tree container on the lab bench. Add the detergent, peroxide and food coloring.Pour the potassium iodide solution into this mixture to catalyze the reaction.Optionally, touch a glowing splint to the foam tree to relight the splint and demonstrate that the bubbles are filled with oxygen. Safety Information Hydrogen peroxide is an oxidizer. This demonstration uses a higher concentration of hydrogen peroxide than the home variety, which means you need to wear gloves to protect your hands against an accidental splash or spill, which could cause a burn. Chemistry Hydrogen peroxide is catalytically decomposed into water and oxgen. This is a nice example of an exothermic reaction. The audience will be able to see steam rising from the foam. The overall equation for the elephant toothpaste chemical reaction is: 2 H2O2(aq) → 2 H2O(l) O2(g) The decomposition reaction of the hydrogen peroxide into water and oxygen is catalzyed by the iodide ion. H2O2(aq) I-(aq) → OI-(aq) H2O(l) H2O2(aq) OI-(aq) → I-(aq) H2O(l) O2(g) Dishwashing detergent is added to capture the oxygen and form bubbles. This is an exothermic reaction which may produce steam. Kid-Friendly Version of the Demonstration If you cant obtain 30% hydrogen peroxide or simply want a demonstration that is safe enough for kids to perform, you can perform an easy variation of this demonstration: detergentwarm water3% hydrogen peroxide (the type sold at pharmacies)pack of active yeast (from a grocery store)green food coloring In an erlenmeyer or tree-shaped container, mix together 1/4 cup detergent, 1/2 cup of the 3% hydrogen peroxide and several drops of green food coloring.In a separate container, stir the packet of yeast into a small amount of warm water. Allow 5 minutes for the yeast to activate before proceeding with the demonstration.Perform the demonstration by pouring the yeast mixture into the peroxide and detergent mixture. This reaction does not produce the huge volume of foam of the traditional elephant toothpaste reaction, but all of the chemicals are safe enough for kids to handle. In this reaction, yeast catalyzes the decomposition of hydrogen peroxide into water and oxygen gas: 2H2O2 → 2H2O O2(g) As in the other reaction, the detergent captures the oxygen to form bubbles. Less foam is produced because there is a smaller amount of hydrogen peroxide to decompose. Learn More Red and Green Color Change Christmas DemonstrationElephant Toothpaste VariationsBorax Crystal Snowflake Decoration

Rules for Japanese Letter Format

Rules for Japanese Letter Format The difference between written language and conversational language in Japanese is much greater than in English. Japanese letters often use classical grammar patterns which are seldom used in conversation. Although there are no particular rules when writing to close friends, there are many set expressions  and honorific expressions (Keigo) used in formal letters. A conversational style is not usually used when writing formal letters. Opening and Closing Words The opening and closing words in letters, which are similar to Englishs Dear and Sincerely etc., come in pairs. Haikei æ‹ Ã¥â€¢â€œ - Keigu æ• ¬Ã¥â€¦ ·The most common pair used in formal letters. Women sometimes use Kashiko㠁‹ã â€"㠁“ as a closing word instead of Keigu.Zenryaku å‰ Ã§â€¢ ¥ - Sousou è â€°Ã£â‚¬â€¦This pair is less formal. It is usually used when you dont have time to write a long letter, so that the preliminary greetings are omitted. Zenryaku literally means, omitting the preliminary remarks. Preliminary Greetings Ogenki de irasshaimasu ka. (very formal)㠁Šå…Æ'æ °â€"㠁 §Ã£ â€žÃ£â€šâ€°Ã£  £Ã£ â€"ã‚Æ'㠁„㠁 ¾Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šHave you been doing well? Ogenki desu ka.㠁Šå…Æ'æ °â€"㠁 §Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šHave you been doing well? Ikaga osugoshi de irasshaimasu ka. (very formal)㠁„㠁‹ã Å'㠁Šé Å½Ã£ â€Ã£ â€"㠁 §Ã£ â€žÃ£â€šâ€°Ã£  £Ã£ â€"ã‚Æ'㠁„㠁 ¾Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šHow have you been? Ikaga osugoshi desu ka.㠁„㠁‹ã Å'㠁Šé Å½Ã£ â€Ã£ â€"㠁 §Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šHow have you been? Okagesama de genki ni shite orimasu. (very formal)㠁Šã â€¹Ã£ â€™Ã£ â€¢Ã£  ¾Ã£  §Ã¥â€¦Æ'æ °â€"㠁 «Ã£ â€"㠁 ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â„¢Ã£â‚¬â€šFortunately Im doing well. Kazoku ichidou genki ni shite orimasu.Ã¥ ® ¶Ã¦â€" Ã¤ ¸â‚¬Ã¥ Å'å…Æ'æ °â€"㠁 «Ã£ â€"㠁 ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â„¢Ã£â‚¬â€šThe whole family is doing well. Otegami arigatou gozaimashita.㠁Šæ‰‹ç ´â„¢Ã£ â€šÃ£â€šÅ Ã£ Å'㠁 ¨Ã£ â€ Ã£ â€Ã£ â€"㠁„㠁 ¾Ã£ â€"㠁Ÿã€‚Thank you for your letter. Nagai aida gobusata shite orimashite moushiwake gozaimasen. (very formal)é• ·Ã£ â€žÃ©â€"“㠁”ç„ ¡Ã¦ ²â„¢Ã¦ ± °Ã£ â€"㠁 ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â€"㠁 ¦Ã§â€ ³Ã£ â€"è ¨ ³Ã£ â€Ã£ â€"㠁„㠁 ¾Ã£ â€ºÃ£â€šâ€œÃ£â‚¬â€šI apologize for neglecting to write for such a long time. Gobusata shite orimasu.㠁”ç„ ¡Ã¦ ²â„¢Ã¦ ± °Ã£ â€"㠁 ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â„¢Ã£â‚¬â€šIm sorry I havent written for a long time. These expressions or seasonal greetings can be combined in a variety of ways to form the preliminary greeting. The Japanese have long admired the seasonal changes, therefore it seems too abrupt to start a letter without the proper seasonal greeting. Here are some examples. Gobusata shite orimasu ga, ogenki de irasshaimasu ka.㠁”ç„ ¡Ã¦ ²â„¢Ã¦ ± °Ã£ â€"㠁 ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â„¢Ã£ Å'〠Ã£ Å Ã¥â€¦Æ'æ °â€"㠁 §Ã£ â€žÃ£â€šâ€°Ã£  £Ã£ â€"ã‚Æ'㠁„㠁 ¾Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šIm sorry I havent written for a long time, but have you been doing well? Sukkari aki rashiku natte mairimashita ga, ikaga osugoshi de irasshaimasu ka.㠁™ã  £Ã£ â€¹Ã£â€šÅ Ã§ §â€¹Ã£â€šâ€°Ã£ â€"㠁 Ã£  ªÃ£  £Ã£  ¦Ã£  ¾Ã£ â€žÃ£â€šÅ Ã£  ¾Ã£ â€"㠁Ÿã Å'〠Ã£ â€žÃ£ â€¹Ã£ Å'㠁Šé Å½Ã£ â€Ã£ â€"㠁 §Ã£ â€žÃ£â€šâ€°Ã£  £Ã£ â€"ã‚Æ'㠁„㠁 ¾Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šIt has become very autumn like; how have you been? Samui hi ga tsuzuite orimasu ga, ikaga osugoshi desu ka.Ã¥ ¯â€™Ã£ â€žÃ¦â€" ¥Ã£ Å'ç ¶Å¡Ã£ â€žÃ£  ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â„¢Ã£ Å'〠Ã£ â€žÃ£ â€¹Ã£ Å'㠁Šé Å½Ã£ â€Ã£ â€"㠁 §Ã£ â„¢Ã£ â€¹Ã£â‚¬â€šCold days continue; how have you been? Final Greetings Douka yoroshiku onegai itashimasu.㠁 ©Ã£ â€ Ã£ â€¹Ã£â€šË†Ã£â€š Ã£ â€"㠁 Ã£ Å Ã© ¡ËœÃ£ â€žÃ£ â€"㠁 ¾Ã£ â„¢Ã£â‚¬â€šKindly look after this matter for me. ~ ni yoroshiku otsutae kudasai.㠁 «Ã£â€šË†Ã£â€š Ã£ â€"㠁 Ã£ Å Ã¤ ¼ Ã£ Ë†Ã£  Ã£   Ã£ â€¢Ã£ â€žÃ£â‚¬â€šPlease give my regards to ~. Minasama ni douzo yoroshiku.皆æ §ËœÃ£  «Ã£  ©Ã£ â€ Ã£ Å¾Ã£â€šË†Ã£â€š Ã£ â€"㠁 Ã£â‚¬â€šPlease give my regards to everyone. Okarada o taisetsu ni.㠁Šä ½â€œÃ£â€šâ€™Ã¥ ¤ §Ã¥Ë†â€¡Ã£  «Ã£â‚¬â€šPlease take care of yourself. Douzo ogenki de.㠁 ©Ã£ â€ Ã£ Å¾Ã£ Å Ã¥â€¦Æ'æ °â€"㠁 §Ã£â‚¬â€šTake care of yourself. Ohenji omachi shite orimasu.㠁Šè ¿â€Ã¤ ºâ€¹Ã£ Å Ã¥ ¾â€¦Ã£  ¡Ã£ â€"㠁 ¦Ã£ Å Ã£â€šÅ Ã£  ¾Ã£ â„¢Ã£â‚¬â€šI look forward to hearing from you.