{"id":25,"date":"2024-10-24T11:49:08","date_gmt":"2024-10-24T15:49:08","guid":{"rendered":"https:\/\/sites.temple.edu\/chemdemo\/?p=25"},"modified":"2024-10-25T16:22:27","modified_gmt":"2024-10-25T20:22:27","slug":"hydrogen-balloon-demo","status":"publish","type":"post","link":"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/hydrogen-balloon-demo\/","title":{"rendered":"Hydrogen Balloon Combustion"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Purpose<\/h2>\n\n\n\n<p>Illustrate limiting reagent by comparing incomplete combustion of hydrogen versus a stoichiometric mix of hydrogen and oxygen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Materials<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hydrogen balloon<\/li>\n\n\n\n<li>Oxygen balloon<\/li>\n\n\n\n<li>Hydrogen and oxygen balloon (2:1 ratio; fill with oxygen first)<\/li>\n\n\n\n<li>Match on a meter stick<\/li>\n\n\n\n<li>Ringstand with clamps<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Procedure<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Setup<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Attach one balloon at a time to the ringstand using a pinch clamp with floral wire.<\/li>\n\n\n\n<li>Start with the hydrogen balloon.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Hydrogen Balloon Test<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Announce to the class: \u201cThis is a hydrogen balloon. What are some of the properties of hydrogen?\u201d<\/li>\n\n\n\n<li>Encourage students to suggest &#8220;flammable.&#8221;<\/li>\n\n\n\n<li>Apply the match to the hydrogen balloon.<\/li>\n\n\n\n<li>Expect a bang and a large flame.<\/li>\n\n\n\n<li>Discuss the reaction: \u201cWhat is going on when something burns? It is reacting with oxygen and releasing a lot of energy.\u201d<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Oxygen Balloon Test<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Explain that our atmosphere contains about 20% oxygen, which isn&#8217;t enough to use up all the hydrogen.<\/li>\n\n\n\n<li>Introduce the second balloon (oxygen).<\/li>\n\n\n\n<li>Have students predict what will happen when the oxygen balloon is tested (bigger, smaller, about the same).<\/li>\n\n\n\n<li>Test it out.<\/li>\n\n\n\n<li>Discuss the result: \u201cWell, that wasn\u2019t very exciting, was it? Why was this disappointing?\u201d<\/li>\n\n\n\n<li>Explain: There wasn\u2019t anything for the oxygen to react with because there is only a tiny trace amount of hydrogen in the atmosphere.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Stoichiometric Mixture<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Discuss the need for an appropriate mixture of fuel and oxygen.<\/li>\n\n\n\n<li>Explain that hydrogen means \u201cwater-making\u201d because it combines with oxygen to form water vapor (H\u2082O).<\/li>\n\n\n\n<li>Identify the correct ratio: \u201cSo what is the ratio? We\u2019re making H\u2082O, so it\u2019s 2:1. Let\u2019s try that.\u201d<\/li>\n\n\n\n<li>Note safety precautions: \u201cPLUG YOUR EARS WITH SOMETHING; this can be very loud!\u201d<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Final Test<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Set off the last balloon.<\/li>\n\n\n\n<li>Emphasize that with the proper mixture, all of the hydrogen is consumed, resulting in a much bigger bang.<\/li>\n\n\n\n<li>Relate the concept to practical applications: \u201cRatios like this are very important for things like car engines. You need the right mix of fuel and oxygen to maximize power.\u201d<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Purpose Illustrate limiting reagent by comparing incomplete combustion of hydrogen versus a stoichiometric mix of hydrogen and oxygen. Materials Procedure<\/p>\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-25","post","type-post","status-publish","format-standard","hentry","category-demonstrations","entry"],"_links":{"self":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/25","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=25"}],"version-history":[{"count":2,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/25\/revisions"}],"predecessor-version":[{"id":27,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/25\/revisions\/27"}],"wp:attachment":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/media?parent=25"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/categories?post=25"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/tags?post=25"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}