{"id":24,"date":"2023-04-01T12:36:25","date_gmt":"2023-04-01T12:36:25","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=24"},"modified":"2023-04-01T12:06:38","modified_gmt":"2023-04-01T12:06:38","slug":"chemistry-2a-form-5-pre-mock-examination-iringa-district-council-may-2021-032","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/chemistry-2a-form-5-pre-mock-examination-iringa-district-council-may-2021-032\/","title":{"rendered":"CHEMISTRY 2A FORM 5 PRE-MOCK EXAMINATION IRINGA DISTRICT COUNCIL MAY 2021 032"},"content":{"rendered":"<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p style=\"text-align: center; margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>THE UNITED REPUBLIC OF TANZANIA<br \/>\n<\/strong><\/span><\/p>\n<p style=\"text-align: center; margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>PRESIDENT&#8217;S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERMENT<br \/>\n<\/strong><\/span><\/p>\n<p style=\"text-align: center; margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>IRINGA DISTRICT COUNCIL<br \/>\n<\/strong><\/span><\/p>\n<p style=\"text-align: center; margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>FORM IV PRE-MOCK EXAMINATION MAY 2021<br \/>\n<\/strong><\/span><\/p>\n<p style=\"margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:14pt\"><strong>032                                                    CHEMISTRY 2A<br \/>\n<\/strong><\/span><\/p>\n<p style=\"margin-left: 18pt\"><span style=\"font-family:Times New Roman\"><span style=\"font-size:14pt\"><strong>TIME; 2:30HOURS                (ACTUAL PRACTICAL A)<\/p>\n<div style=\"margin-left: 6pt\">\n<table style=\"border-collapse:collapse\" border=\"0\">\n<colgroup>\n<col style=\"width:547px\"\/><\/colgroup>\n<tbody valign=\"top\">\n<tr style=\"height: 7px\">\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  solid 0.5pt\">\u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><\/strong><\/span><\/p>\n<p style=\"margin-left: 18pt\">\n\u00a0<\/p>\n<p style=\"text-align: center; margin-left: 18pt\"><span style=\"font-size:12pt\"><strong>INSTRUCTIONS:<br \/>\n<\/strong><\/span><\/p>\n<ol style=\"margin-left: 54pt\">\n<li><span style=\"font-size:12pt\">This paper consists of two<strong> questions<\/strong>.<br \/>\n<\/span><\/li>\n<\/ol>\n<p><\/span><\/p>\n<ol style=\"margin-left: 54pt\">\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Answer <strong>all<\/strong> questions.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Qualitative Analysis Guidance Pamphlets may be used after a thorough check by the supervisor.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Each question carries<strong> 25 marks<\/strong><br \/>\n\t\t\t<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Cellular phones and any authorised materials are <strong>not<\/strong> allowed in the examination room.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Write your<strong> Examination number<\/strong> on every page of your answer booklet(s)<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">You may use the following constant:<br \/>\n<\/span><\/li>\n<\/ol>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">          Atomic masses:<br \/>\n<\/span><\/p>\n<p style=\"margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:12pt\">            H=1, C=12, O=16, K=39, S=32<br \/>\n<\/span><\/p>\n<p style=\"margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:12pt\">             1litre=1dm<sup>3<\/sup>=1000cm<sup>3<\/sup><br \/>\n\t\t<\/span><\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<ol style=\"margin-left: 54pt\">\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">You are provided with the following solutions:<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">U:   0.05M sulphuric acid solution.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">T:   Containing 1.4g of metal hydroxide (YOH) dissolved in 250cm<sup>3<\/sup> of the solution.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">M.O:  Methyl orange.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Procedures:<br \/>\n<\/span><\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Put solution U into the burette, pipette 25cm<sup>3<\/sup> or 20cm<sup>3<\/sup> of solution T into titration flask. Put two to three drops of methyl orange into the titration flask. Titrate solution U from the burette against solution T in the titration flask until colour change is observed. Note the burette readings. Repeat the procedures to obtain three more readings in a tabular form.<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<p style=\"text-align: center\"><span style=\"font-family:Times New Roman; font-size:12pt\">QUESTIONS:<br \/>\n<\/span><\/p>\n<ol style=\"margin-left: 54pt\">\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">(i)\u2026\u2026\u2026\u2026cm<sup>3<\/sup> of T required \u2026\u2026\u2026\u2026.cm<sup>3<\/sup> of U for complete reaction.<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(ii)The colour change at end point was from\u2026\u2026\u2026\u2026\u2026&#8230;&#8230;to \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.<br \/>\n<\/span><\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">(i)Write a balanced chemical and ionic equation for the reaction between solution U and T.<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(ii)State a reason to why methyl orange indicator is used.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(iii)State which solution is titrant and analyate?<br \/>\n<\/span><\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Calculate the concentration of solution T in,<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(i) mol\/dm<sup>3<\/sup> (ii) g\/dm<sup>3<\/sup><span style=\"text-decoration:underline\"><br \/>\n\t\t\t\t\t<\/span><\/span><\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Calculate<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(i) The molar mass of metal hydroxide YOH<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(ii) The atomic mass of Y<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">(iii) Name element Y<br \/>\n<\/span><\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Mention two application of volumetric analysis in medicine.<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">You are provided with the following:<br \/>\n<\/span><\/div>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">A: Containing 1M sodium thiosulphate (Na<sub>2<\/sub>S<sub>2<\/sub>O<sub>4<\/sub>)<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">B: Containing 0.1M Nitric acid (HNO<sub>3<\/sub>)<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">C: Distilled water,<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Piece of paper<br \/>\n<\/span><\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Stop-watch<br \/>\n<\/span><\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"> Procedures<br \/>\n<\/span><\/p>\n<ol>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Using measuring cylinder measure 5cm<sup>3<\/sup> of solution A and put 100cm<sup>3<\/sup> beaker.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Measure 5cm<sup>3 <\/sup>of solution B and put into 100cm<sup>3<\/sup>beaker containing solution A and immediately start the stop- watch.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Swirl the contents in the 100cm<sup>3<\/sup> beaker and put the beaker on the top of mark X on piece of the &#8216;paper. Watch the mixture from the above and observe changes.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Switch off the stop \u2013watch when the mark X disappears.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Record the time taken for the later X to disappear.<br \/>\n<\/span><\/li>\n<li>\n<div><span style=\"font-family:Times New Roman; font-size:12pt\">Repeat procedures (i) to (v) using the data shown in Table 1.<br \/>\n<\/span><\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<p style=\"margin-left: 18pt\">\n\u00a0<\/p>\n<p style=\"margin-left: 18pt\">\n\u00a0<\/p>\n<p style=\"margin-left: 18pt\">\n\u00a0<\/p>\n<p style=\"text-align: center; margin-left: 18pt\"><span style=\"font-family:Times New Roman; font-size:12pt\">Table1<br \/>\n<\/span><\/p>\n<\/li>\n<\/ol>\n<div style=\"margin-left: 72pt\">\n<table style=\"border-collapse:collapse\" border=\"0\">\n<colgroup>\n<col style=\"width:109px\"\/>\n<col style=\"width:100px\"\/>\n<col style=\"width:100px\"\/>\n<col style=\"width:102px\"\/>\n<col style=\"width:94px\"\/><\/colgroup>\n<tbody valign=\"top\">\n<tr>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  solid 0.5pt; border-left:  solid 0.5pt; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Experiment<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  solid 0.5pt; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Volume of B cm<sup>3<\/sup><\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  solid 0.5pt; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Volume of A cm<sup>3<\/sup><\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  solid 0.5pt; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Volume of Distilled water cm<sup>3<\/sup><\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  solid 0.5pt; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">Time (s)<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  solid 0.5pt; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">1<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">5<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">5<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">0<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  solid 0.5pt; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">2<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">5<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">4<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">1<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  solid 0.5pt; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">3<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">5<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">3<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">2<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  solid 0.5pt; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">4<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">5<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">2<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\n<p><span style=\"font-family:Times New Roman; font-size:12pt\">3<\/span><\/p>\n<\/td>\n<td style=\"padding-left: 7px; padding-right: 7px; border-top:  none; border-left:  none; border-bottom:  solid 0.5pt; border-right:  solid 0.5pt\">\u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p style=\"text-align: center\"><span style=\"font-family:Times New Roman; font-size:12pt\">QUESTIONS.<br \/>\n<\/span><\/p>\n<p>\n\u00a0<\/p>\n<ol>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">What is the aim of the whole experiment?<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Complete Table1<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">With state symbols, write the balanced chemical for the reaction between A and B.<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Which the substance was produced during the reaction which obscured letter X?<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Why did the cross X disappear?<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Write two main allotropes and two uses of the product which obscured the cross X<br \/>\n<\/span><\/li>\n<li><span style=\"font-family:Times New Roman; font-size:12pt\">Plot the graph of volume of A ( Na<sub>2<\/sub>S<sub>2<\/sub>O<sub>3<\/sub>) solution against time (s)<br \/>\n<\/span><\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p><span style=\"font-family:Times New Roman; font-size:12pt\"><br \/>\n\t\t<\/span>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 \u00a0 THE UNITED REPUBLIC OF TANZANIA PRESIDENT&#8217;S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERMENT IRINGA DISTRICT COUNCIL FORM IV PRE-MOCK<\/p>\n","protected":false},"author":1,"featured_media":293,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-24","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 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>CHEMISTRY 2A FORM 5 PRE-MOCK EXAMINATION IRINGA DISTRICT COUNCIL MAY 2021 032 - MAKTABA EDUCATION CENTER<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/edu.co.tz\/notes\/chemistry-2a-form-5-pre-mock-examination-iringa-district-council-may-2021-032\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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