{"id":59,"date":"2024-10-24T14:42:22","date_gmt":"2024-10-24T18:42:22","guid":{"rendered":"https:\/\/sites.temple.edu\/chemdemo\/?p=59"},"modified":"2024-10-25T16:22:14","modified_gmt":"2024-10-25T20:22:14","slug":"water-magic-tricks","status":"publish","type":"post","link":"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/water-magic-tricks\/","title":{"rendered":"Water Magic Tricks"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Bending a Stream of Water<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Code Name<\/h3>\n\n\n\n<p>Electrostatic attraction of water<br><strong>Demo #<\/strong>: Gen.5<br><strong>Reference<\/strong>: Chemical Demonstrations: A Handbook for Teachers of Chemistry, Vol 2: p. 91<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Equipment<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>2 x 50 mL burettes with double burette clamp and stand<\/li>\n\n\n\n<li>2 x 400 mL beakers<\/li>\n\n\n\n<li>Rubber or plastic rod<\/li>\n\n\n\n<li>Piece of wool or fur<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Chemicals<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Distilled water<\/li>\n\n\n\n<li>Hexane<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Procedure<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Fill one burette with hexane and the other with distilled water.<\/li>\n\n\n\n<li>Adjust the stopcock on the water burette to create a fine unbroken stream into a 400 mL beaker.<\/li>\n\n\n\n<li>Charge the rubber or plastic rod with the wool or fur, and demonstrate that water is attracted to the rod (ensure the water does not touch the rod).<\/li>\n\n\n\n<li>Repeat the demonstration with the hexane burette to show that hexane is not attracted to the rod.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Variation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use a vinyl plastic strip charged with wool to show that water is attracted to a negative charge.<\/li>\n\n\n\n<li>Use a piece of acetate plastic charged with a paper towel to show that water is attracted to a positive charge.<\/li>\n\n\n\n<li>This demonstrates that water has both a positive and a negative end.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. Disappearing Water<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Code Name<\/h3>\n\n\n\n<p>Sodium polyacrylate gel<br><strong>Demo #<\/strong>: Gen.17<br><strong>Reference<\/strong>: Commonly known<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Equipment<\/h3>\n\n\n\n<p><strong>Part A<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Small glass (with even lip)<\/li>\n\n\n\n<li>Piece of cardboard<\/li>\n<\/ul>\n\n\n\n<p><strong>Part B<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Styrofoam cup<\/li>\n\n\n\n<li>Piece of cardboard with \u201cDo not remove this cardboard\u201d written on both sides<\/li>\n\n\n\n<li>Water pitcher<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Chemicals<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jug of water<\/li>\n\n\n\n<li>Sodium polyacrylate powder<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Procedure<\/h3>\n\n\n\n<p><strong>Part A<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Fill the glass 3\/4 full with water.<\/li>\n\n\n\n<li>Place the cardboard over the mouth of the glass and invert it.<\/li>\n\n\n\n<li>Release the cardboard; the water remains in the glass.<\/li>\n<\/ol>\n\n\n\n<p><strong>Part B<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Pre-fill a styrofoam cup with sodium polyacrylate powder (unseen).<\/li>\n\n\n\n<li>Have a student hold the cup in the air with both hands.<\/li>\n\n\n\n<li>Pour water from the pitcher into the cup and cover the mouth with cardboard.<\/li>\n\n\n\n<li>While the student is still holding the cup, turn it upside down over their head and lower it onto their head.<\/li>\n\n\n\n<li>Pull the cardboard out and have the student read the card. Finally, lift the cup off their head to show that no water comes out.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation<\/h3>\n\n\n\n<p><strong>Part A<\/strong>: As the water tries to exit the glass, the pressure inside decreases, allowing atmospheric pressure to hold the cardboard against the rim of the glass.<\/p>\n\n\n\n<p><strong>Part B<\/strong>: The sodium polyacrylate quickly forms a gel when water is added, preventing it from escaping.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bending a Stream of Water Code Name Electrostatic attraction of waterDemo #: Gen.5Reference: Chemical Demonstrations: A Handbook for Teachers of Chemistry, Vol 2: p. 91&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/water-magic-tricks\/\">Continue Reading<span class=\"screen-reader-text\">Water Magic Tricks<\/span><\/a><\/div>\n","protected":false},"author":36673,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-59","post","type-post","status-publish","format-standard","hentry","category-demonstrations","entry"],"_links":{"self":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/59","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/users\/36673"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/comments?post=59"}],"version-history":[{"count":1,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/59\/revisions"}],"predecessor-version":[{"id":60,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/59\/revisions\/60"}],"wp:attachment":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/media?parent=59"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/categories?post=59"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/tags?post=59"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}