{"id":46,"date":"2023-04-01T12:10:40","date_gmt":"2023-04-01T12:10:40","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=46"},"modified":"2023-04-01T12:45:09","modified_gmt":"2023-04-01T12:45:09","slug":"oxygen-summary-notes","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/oxygen-summary-notes\/","title":{"rendered":"OXYGEN SUMMARY NOTES"},"content":{"rendered":"<p style=\"text-align: center\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>TOPIC: ATMOSPHERE AND COMBUSTION<br \/>\n<\/strong><\/span><\/p>\n<p style=\"text-align: center\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>SUBTOPIC:<br \/>\n<\/strong><\/span><\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"><strong>TEST FOR OXYGEN<br \/>\n<\/strong><\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">When a glowing splint is placed in a jar containing Oxygen the glowing splint relights<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"><strong>USES OF OXYGEN<br \/>\n<\/strong><\/span><\/p>\n<ul>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Used in respiration in living organisms<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Oxygen is used in manufacture of steel<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Liquid oxygen is used as fuel in space rockets<br \/>\n<\/span><\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">The mixture of acetylene (ethyne) and oxygen burn to <strong>produce<\/strong> a very hot flame used in welding and metal cutting<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"><strong>PHYSICAL PROPERTIES OF OXYGEN<br \/>\n<\/strong><\/span><\/p>\n<\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">It is colourless, odourless and tasteless gas<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Slightly soluble in cold water<br \/>\n<\/span><\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Neutral to litmus<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"><strong>CHEMICAL PROPERTIES OF OXYGEN<br \/>\n<\/strong><\/span><\/p>\n<\/li>\n<\/ul>\n<ol>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\"><strong>Reaction with metals<br \/>\n<\/strong><\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Reaction of oxygen with metals form oxides, most of them are basic in character. The solutions of these oxides in water will be alkaline (Turn Red litmus paper blue), thus have a PH greater than 7.<br \/>\n<\/span><\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\"><strong>Reaction of oxygen with sodium<br \/>\n<\/strong><\/span><\/li>\n<\/ol>\n<ul>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Sodium burns in Oxygen with a bright yellow flame forming a yellow solid of sodium peroxide<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1337_OXYGENSUMMA1.png\" alt=\"\"\/><span style=\"font-family:Times New Roman; font-size:12pt\">2Na<sub>(s)<\/sub> + O<sub>2(g)<\/sub>                   Na<sub>2<\/sub>O<sub>2(s)<br \/>\n<\/sub><\/span><\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ul>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">When the product (sodium peroxide) is added to water and shaken, it dissolves with effervescence of a colourless gas (Oxygen) forming a colourless solution of sodium hydroxide. The solution turns red litmus paper blue implying sodium burns to form a white solid of sodium oxide.<br \/>\n<\/span><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1337_OXYGENSUMMA2.png\" alt=\"\"\/><span style=\"font-family:Times New Roman; font-size:12pt\">\u00a0\u00a0\u00a0\u00a02Na<sub>2<\/sub>O<sub>2(s) <\/sub>+ 2H<sub>2<\/sub>O<sub>(l)<\/sub>                             4NaOH<sub>(aq)<\/sub> + O<sub>2(g)<\/sub><br \/>\n\t\t<\/span><\/p>\n<p>\n\u00a0<\/p>\n<ul>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">However in limited oxygen supply, sodium burns to form a white solid of sodium oxide.<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1337_OXYGENSUMMA3.png\" alt=\"\"\/><span style=\"font-family:Times New Roman; font-size:12pt\">4Na<sub>(S)<\/sub>  + O<sub>2(g) <\/sub>                               2Na<sub>2<\/sub>O<sub>(s)<\/sub><br \/>\n\t\t\t\t<\/span><\/p>\n<\/li>\n<\/ul>\n<ol>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Sodium metal was burnt in excess oxygen.<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">a(i) State what was observed<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(ii) Write the equation for the reaction that took place<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">b) The product formed from (a) above was dissolved in water.<br \/>\n<\/span><\/p>\n<ol>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">State what was observed<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Write equation for the reaction that took place between the product from 1a) and water<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">The solution formed was<br \/>\n<\/span><\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">When water was added to solid Y, a gas that relights a glowing splint was given off.<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">a(i) Name solid Y<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(ii) Write the equation for the reaction that took place.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">b(i) State what would be observed if some red litmus were dropped in the resulting solution in a(ii) above.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(ii) State any three uses of oxygen gas<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"><br \/>\n\t\t\t\t<\/span>\u00a0<\/p>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>TOPIC: ATMOSPHERE AND COMBUSTION SUBTOPIC: \u00a0 TEST FOR OXYGEN When a glowing splint is placed in a jar containing Oxygen<\/p>\n","protected":false},"author":1,"featured_media":332,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-46","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chemistry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - 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