{"id":36,"date":"2023-04-01T12:31:13","date_gmt":"2023-04-01T12:31:13","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=36"},"modified":"2023-04-01T11:51:57","modified_gmt":"2023-04-01T11:51:57","slug":"chemistry-form-two-pre-mock-examinations","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/chemistry-form-two-pre-mock-examinations\/","title":{"rendered":"CHEMISTRY FORM TWO PRE- MOCK EXAMINATIONS"},"content":{"rendered":"<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO1.png\" alt=\"\"\/>\n\t<\/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<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p style=\"background: white\">\n\t\t<span style=\"font-size:10pt\"><br \/>\n\t\t\t<span style=\"color:#202124\"><strong>FORM TWO PRE- MOCK EXAMINATIONS<br \/>\n<\/strong><\/span><\/span><\/p>\n<p style=\"background: white\"><span style=\"color:#202124; font-size:10pt\"><strong>                                                                      CHEMISTRY<br \/>\n<\/strong><\/span><\/p>\n<p style=\"background: white\"><span style=\"font-size:10pt\"><span style=\"color:#202124\"><strong>                           GOLDEN SECONDARY SCHOOL &#8211; EXTERNAL EXAMINATION<\/strong><\/span><br \/>\n\t\t<\/span><br \/>\n\t\t<span style=\"color:#202124; font-size:10pt\"><strong><br \/>\n\t\t\t<\/strong><\/span><\/p>\n<p>TIME:2:30 HRS\n<\/p>\n<p><strong>INSTRUCTIONS:<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div style=\"text-align: justify\">This paper consists of sections A, B and C.\n<\/div>\n<\/li>\n<li>\n<div style=\"text-align: justify\">Answer <strong>all <\/strong>questions in all questions.\n<\/div>\n<\/li>\n<li>\n<div style=\"text-align: justify\"><strong>All writing should be in blue or black ink except diagram which must be in pencil.<br \/>\n<\/strong><\/div>\n<\/li>\n<li>\n<div style=\"text-align: justify\">All communication devices are not allowed in the examination room.\n<\/div>\n<\/li>\n<li>\n<div style=\"text-align: justify\">Non programmable calculators are allowed in the examination room.\n<\/div>\n<\/li>\n<li>\n<div style=\"text-align: justify\">The following constant may be applied: R.A.M; C = 12, H = 1, O =16, S = 32, Na = 23, Ca =40\n<\/div>\n<\/li>\n<li>\n<div style=\"text-align: justify\"><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO2.png\" alt=\"\"\/>\n\t\t\t<\/div>\n<\/li>\n<\/ol>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\"><strong>SECTION A (10 Marks)<br \/>\n<\/strong><\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<ol>\n<li>For each of the items (i) \u2013 (x) choose the correct answer from the given alternatives and write its letter in the box provided.\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<ol style=\"margin-left: 63pt\">\n<li>\n<div>The part of Bunsen burner that controls the amount of air coming in is called:\n<\/div>\n<ol>\n<li><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO3.png\" alt=\"\"\/>Air hole\n<\/li>\n<li>Barrel\n<\/li>\n<li>Collar\n<\/li>\n<li>\n<div>Jet\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO4.png\" alt=\"\"\/>A ____________ is a container which is made of porcelain and in which substances can be heated to very high temperature.\n<\/div>\n<ol>\n<li>Wire gauze\n<\/li>\n<li>Tripod stand\n<\/li>\n<li>Crucible\n<\/li>\n<li>\n<div>Boiling tube\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div>Which of the following is <span style=\"text-decoration:underline\">not<\/span>a product produced by the use of chemistry in agriculture?\n<\/div>\n<ol>\n<li><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO5.png\" alt=\"\"\/>Fertilizers\n<\/li>\n<li>Weed killers\n<\/li>\n<li>Canned food\n<\/li>\n<li>\n<div>Animal vaccines\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO6.png\" alt=\"\"\/>Which of the following apparatuses is used for scooping chemicals?\n<\/div>\n<ol>\n<li>A pair of tongs\n<\/li>\n<li>Spatula\n<\/li>\n<li>Test tube holder\n<\/li>\n<li>\n<div>Filter funnel\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO7.png\" alt=\"\"\/>An element X with atomic number 16, belongs to:\n<\/div>\n<ol>\n<li>Period 3, group III, valency of 2\n<\/li>\n<li>Period 3, group VI, valencyof 2\n<\/li>\n<li>Period 3, group VI, valency of 6\n<\/li>\n<li>Period 6, group VI, valency of 6\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<ol style=\"margin-left: 63pt\">\n<li>\n<div>Which of the following is a sequential method of separating mixture of salt and sand?\n<\/div>\n<ol>\n<li><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO8.png\" alt=\"\"\/>Evaporation, filtration and decantation.\n<\/li>\n<li>Decantation, evaporation and filtration.\n<\/li>\n<li>Sedimentation, evaporation and filtration.\n<\/li>\n<li>\n<div>Decantation, filtration and evaporation.\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div>what is the oxidation state of chlorine in KClO<sub>3<\/sub>\n\t\t\t<\/div>\n<ol>\n<li><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO9.png\" alt=\"\"\/>+2\n<\/li>\n<li>-5\n<\/li>\n<li>+5\n<\/li>\n<li>\n<div>+3\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div>__________ is the blockage of the upper part of the airway by food or other objects.\n<\/div>\n<ol>\n<li><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO10.png\" alt=\"\"\/>Choking\n<\/li>\n<li>Suffocation\n<\/li>\n<li>Shock\n<\/li>\n<li>\n<div>Poisoning\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<\/li>\n<li>\n<div><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO11.png\" alt=\"\"\/>If somebody has the signs of poisoning such as pain, difficulty in breathing, diarrhoea, abdominal cramps or vomiting, we should <span style=\"text-decoration:underline\">not<\/span>:\n<\/div>\n<ol>\n<li>Call for medical assistance\n<\/li>\n<li>Find out what caused poisoning as it is not important.\n<\/li>\n<li>Force him\/her to vomit if the poison has been swallowed and it is corrosive.\n<\/li>\n<li>\n<div>Apply ointment if the poison is on the skin.\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<li>\n<div>Which one comes right after the step 3 (experimentation and observation).\n<\/div>\n<ol>\n<li><img decoding=\"async\" align=\"left\" src=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042122_1332_CHEMISTRYFO12.png\" alt=\"\"\/>Formulation of hypothesis\n<\/li>\n<li>Data interpretation\n<\/li>\n<li>Data collection\n<\/li>\n<li>\n<div>Problem identification\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p style=\"text-align: center\"><strong>SECTION B (Marks 10)<br \/>\n<\/strong><\/p>\n<p style=\"text-align: center\">\n\u00a0<\/p>\n<ol>\n<li>\n<div>You are provided with a two <strong>LIST A<\/strong> and <strong>B<\/strong>. Choose a word(s) form <strong>LIST B<\/strong> which matches the statement or phrase in <strong>LIST A<\/strong> and write its letter in the table provided.\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<div style=\"margin-left: 26pt\">\n<table style=\"border-collapse:collapse\" border=\"0\">\n<colgroup>\n<col style=\"width:391px\"\/>\n<col style=\"width:197px\"\/><\/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><strong>LIST A<\/strong><\/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><strong>LIST B<\/strong><\/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<ol>\n<li>  Used to scooping small amount of powder or crystals.\n<\/li>\n<li>  Used to separate solid from liquid.\n<\/li>\n<li>Used to hold hot substance and apparatus.\n<\/li>\n<li>Used to store different chemicals.\n<\/li>\n<li> Used to hold substance that are being weighed or observed.\n<\/li>\n<li>Used to store distilled water.\n<\/li>\n<li>Used to measure volume of liquid or gases.\n<\/li>\n<li> Used to heat small amount of substance inside the gas jar.\n<\/li>\n<li>  Used to protect eyes.\n<\/li>\n<li>Used to accurately time laboratory process. <\/li>\n<\/ol>\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<ol>\n<li>Beaker\n<\/li>\n<li>Tongs\n<\/li>\n<li>Conical flask\n<\/li>\n<li>Measuring cylinder\n<\/li>\n<li>Reagent bottle\n<\/li>\n<li>Thermometer\n<\/li>\n<li>Stop watch\n<\/li>\n<li>Measuring syringe\n<\/li>\n<li>Watch glass\n<\/li>\n<li>Deflagrating spoon\n<\/li>\n<li>Separating funnel\n<\/li>\n<li>Plastic wash bottle\n<\/li>\n<li>Filter funnel\n<\/li>\n<li>Spatula\n<\/li>\n<li>crucible<\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\n\u00a0<\/p>\n<p><strong>ANSWERS<br \/>\n<\/strong><\/p>\n<div style=\"margin-left: 41pt\">\n<table style=\"border-collapse:collapse\" border=\"0\">\n<colgroup>\n<col style=\"width:56px\"\/>\n<col style=\"width:50px\"\/>\n<col style=\"width:50px\"\/>\n<col style=\"width:56px\"\/>\n<col style=\"width:50px\"\/>\n<col style=\"width:50px\"\/>\n<col style=\"width:50px\"\/>\n<col style=\"width:56px\"\/>\n<col style=\"width:56px\"\/>\n<col style=\"width:50px\"\/>\n<col style=\"width:47px\"\/><\/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><strong>LIST A<\/strong><\/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 style=\"text-align: center\">i<\/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 style=\"text-align: center\">ii<\/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 style=\"text-align: center\">iii<\/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 style=\"text-align: center\">iv<\/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 style=\"text-align: center\">v<\/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 style=\"text-align: center\">Vi<\/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 style=\"text-align: center\">vii<\/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 style=\"text-align: center\">viii<\/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 style=\"text-align: center\">ix<\/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 style=\"text-align: center\">X<\/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><strong>LIST B<\/strong><\/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<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<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<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<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<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<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<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<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<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 style=\"text-align: center\">\n\u00a0<\/p>\n<p style=\"text-align: center\"><strong>SECTION C (Marks 80)<br \/>\n<\/strong><\/p>\n<p>\n\u00a0<\/p>\n<ol>\n<li>\n<div>(a)\u00a0\u00a0\u00a0\u00a0Write the symbols of the elements below.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n<\/div>\n<ol style=\"margin-left: 54pt\">\n<li>Silver: ________________\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii)      Chromium: _____________\n<\/li>\n<\/ol>\n<p style=\"margin-left: 18pt\">(iii)\u00a0\u00a0\u00a0\u00a0Calcium: ______________\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(iv)     Mercury: _______________\n<\/p>\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<p style=\"margin-left: 36pt\">(b)\u00a0\u00a0\u00a0\u00a0Write the IUPAC names for each of the following compound:\n<\/p>\n<ol style=\"margin-left: 54pt\">\n<li>N<sub>2 <\/sub>O<sub>4<\/sub>__________________________<span style=\"text-decoration:underline\"><br \/>\n\t\t\t<\/span><\/li>\n<li>Fe<sub>2<\/sub>O<sub>3<\/sub> __________________________\n<\/li>\n<li>CuO   __________________________\n<\/li>\n<li>PbO<sub>2<\/sub> __________________________\n<\/li>\n<li>MnO<sub>2<\/sub>__________________________\n<\/li>\n<\/ol>\n<p>(c)\u00a0\u00a0\u00a0\u00a0Explain <strong>three points<\/strong> on the importance of changing one state of matter to another.\n<\/p>\n<ol style=\"margin-left: 72pt\">\n<li>_________________________________________________________________________\n<\/li>\n<li>_________________________________________________________________________\n<\/li>\n<li>\n<div>_________________________________________________________________________\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<ol>\n<li>\n<div>Study the periodic Table below:\n<\/div>\n<p><strong> I\u00a0\u00a0\u00a0\u00a0VIII<br \/>\n<\/strong><\/p>\n<\/li>\n<\/ol>\n<div style=\"margin-left: 23pt\">\n<table style=\"border-collapse:collapse\" border=\"0\">\n<colgroup>\n<col style=\"width:68px\"\/>\n<col style=\"width:75px\"\/>\n<col style=\"width:75px\"\/>\n<col style=\"width:74px\"\/>\n<col style=\"width:74px\"\/>\n<col style=\"width:75px\"\/>\n<col style=\"width:75px\"\/>\n<col style=\"width:75px\"\/><\/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>      A<\/p>\n<\/td>\n<td colspan=\"6\" 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><strong>II                        III                   IV                     V                       VI                    VII<\/strong><\/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>      B<\/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>      C<\/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<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>       D<\/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<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<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<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<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>      E<\/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>      F<\/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<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<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<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<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>        G<\/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>         H<\/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\">\u00a0<\/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>J<\/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<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<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<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<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<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 style=\"margin-left: 18pt\">\n\u00a0<\/p>\n<p style=\"margin-left: 18pt\">Use the letters shown in the Periodic Table above to indicate:\n<\/p>\n<ol>\n<li>Elements with zero valency._______________________________________\n<\/li>\n<li>The lightest atom.___________________________\n<\/li>\n<li>The alkaline earth metal.______________________\n<\/li>\n<li>An element with an electronic configuration of <strong>2:8:1<\/strong>._________________________\n<\/li>\n<li>\n<div>Give the names of the elements represented by the mentioned letters <strong>A<\/strong>,<strong>B<\/strong>,<strong>C<\/strong>,<strong>D<\/strong> and <strong>J<\/strong>\n\t\t\t<\/div>\n<p><strong>A ________________<br \/>\n<\/strong><\/p>\n<p><strong>B ________________<br \/>\n<\/strong><\/p>\n<p><strong>C ________________<br \/>\n<\/strong><\/p>\n<p><strong>D ________________<br \/>\n<\/strong><\/p>\n<p><strong>J  ________________<\/strong>\n\t\t\t<\/p>\n<\/li>\n<li>\n<div>Write the electronic configuration of <span style=\"font-size:12pt\"><strong>J<sup>2+<\/sup>.<\/strong><\/span> ___________________________________\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<ol>\n<li>(a)\u00a0\u00a0\u00a0\u00a0In an experiment, two iron nails A and B were used whereby painting was applied on nail A. The two nails were placed in a moist environment and after one month the weight of each nail was determined. Which of the two nails would be heavier? Give reason. ___________________________________________________________________________________\n<\/li>\n<\/ol>\n<p>___________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 18pt\">(b)\u00a0\u00a0\u00a0\u00a0State the method which will be used to protect each of the following from rusting.\n<\/p>\n<p style=\"margin-left: 18pt\">\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Covering iron sheets with a layer of most reactive metals. _____________________________\n<\/p>\n<p style=\"margin-left: 18pt\">\u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0Bicycle chain. ___________________________________\n<\/p>\n<p style=\"margin-left: 18pt\">(c)\u00a0\u00a0\u00a0\u00a0Find the oxidation number of the underlined elements in the following:\n<\/p>\n<p style=\"margin-left: 18pt\">\u00a0\u00a0\u00a0\u00a0(i) <span style=\"text-decoration:underline\">Mn<\/span>O<sub>4<\/sub><sup>&#8211;<\/sup>\n\t<\/p>\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=\"margin-left: 18pt\">\n\u00a0<\/p>\n<ol style=\"margin-left: 54pt\">\n<li>\n<div>K<sub>2<\/sub><span style=\"text-decoration:underline\">Cr<\/span><sub>2<\/sub>O<sub>7<\/sub>\n\t\t\t<\/div>\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=\"text-decoration:underline\">H<\/span><sub>2<\/sub>O<sub>2<\/sub>\u00a0\u00a0\u00a0\u00a0\n<\/div>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<ol>\n<li>\n<div>(a)\u00a0\u00a0\u00a0\u00a0(i) Why may a flame produced by a &#8220;spirit lamp&#8221; not be good for heating in the laboratory? Give\n<\/div>\n<p>two reasons.\n<\/p>\n<p style=\"margin-left: 35pt\">________________________________________________________________________________________________________________________________________________________________\n<\/p>\n<ol style=\"margin-left: 57pt\">\n<li>Name the type of flame produced by a spirit lamp. _______________________________________\n<\/li>\n<\/ol>\n<p style=\"margin-left: 21pt\">(b)\u00a0\u00a0\u00a0\u00a0By using the locally available materials in your school, state how the fire can be extinguished in the following situations:\n<\/p>\n<p style=\"margin-left: 21pt\">\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Kerosene spilled on the floor catches fire._____________________________________________\n<\/p>\n<p style=\"margin-left: 21pt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0_______________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 21pt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0_______________________________________________________________________________\n<\/p>\n<ol style=\"margin-left: 57pt\">\n<li>Friend&#8217;s clothes catch fire which gets out of her control._________________________________\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>\u00a0\u00a0\u00a0\u00a0_______________________________________________________________________________\u00a0\u00a0\u00a0\u00a0_______________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 36pt\">(c)\u00a0\u00a0\u00a0\u00a0State four characteristics of a good fuel\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n<\/p>\n<p style=\"margin-left: 36pt\">___________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 36pt\">___________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 36pt\">______________________________________________________________________________________________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 36pt\">\n\u00a0<\/p>\n<p style=\"margin-left: 36pt\">\n\u00a0<\/p>\n<ol>\n<li>\n<div>(a) Which method would you use to separate each of the following mixtures?\n<\/div>\n<ol style=\"margin-left: 54pt\">\n<li>\n<div>Water mixed with kerosene\n<\/div>\n<p>____________________________________________________________________________\n<\/p>\n<\/li>\n<li>\n<div>Iron powder mixed with sand.\n<\/div>\n<p>____________________________________________________________________________\n<\/p>\n<\/li>\n<li>\n<div>Ammonium chloride crystals mixed with sodium chloride crystals\n<\/div>\n<p>____________________________________________________________________________\n<\/p>\n<\/li>\n<li>\n<div>Water mixed with alcohol.\n<\/div>\n<p>____________________________________________________________________________\n<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>\u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0Name one function for each of the following laboratory apparatus:\n<\/p>\n<ol style=\"margin-left: 54pt\">\n<li>Burette._________________________________________________________________________\n<\/li>\n<li>Desiccator.______________________________________________________________________\n<\/li>\n<li>Kipp&#8217;s apparatus._________________________________________________________________\n<\/li>\n<li>\n<div>Liebig condenser. _________________________________________________________________\n<\/div>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<ol>\n<li>(a)    Draw a well labelled diagram of preparation hydrogen gas.\n<\/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>\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<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<p style=\"margin-left: 17pt\">(b)   Briefly explain how hydrogen gas is tested in the laboratory.\n<\/p>\n<p style=\"margin-left: 17pt\">        __________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 17pt\">        __________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 17pt\">(c)    State any three uses of hydrogen gas.\n<\/p>\n<p style=\"margin-left: 17pt\">        __________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 17pt\">        __________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 17pt\">        __________________________________________________________________________________\n<\/p>\n<p style=\"margin-left: 17pt\">\n\u00a0<\/p>\n<p style=\"margin-left: 17pt\">\n\u00a0<\/p>\n<p style=\"margin-left: 17pt\">\n\u00a0<\/p>\n<ol>\n<li>\n<div>(a)    What is air?\n<\/div>\n<p>        __________________________________________________________________________________\n<\/p>\n<p>(b)    Mention all the components of air with their percentage composition:\n<\/p>\n<p>         _____________________________________\n<\/p>\n<p>         _____________________________________\n<\/p>\n<p>         _____________________________________\n<\/p>\n<p>         _____________________________________\n<\/p>\n<p>(c)Give four reasons why air is said to be a mixture and not a compound.\n<\/p>\n<p>         __________________________________________________________________________________\n<\/p>\n<p>         __________________________________________________________________________________\n<\/p>\n<p>         __________________________________________________________________________________\n<\/p>\n<p>         __________________________________________________________________________________\n<\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<ol>\n<li>\n<div>(a)    Calculate the percentage composition of the underlined elements in the following compounds:\n<\/div>\n<ol style=\"margin-left: 54pt\">\n<li>\n<div>Na<sub>2<\/sub><span style=\"text-decoration:underline\">S<\/span>O<sub>4<\/sub>\n\t\t\t\t\t<\/div>\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>Ca(H<span style=\"text-decoration:underline\">C<\/span>O<sub>3<\/sub>)<sub>2<\/sub>\n\t\t\t\t\t<\/div>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>        (b)  A compound M is composed of 52.2% carbon, 13% hydrogen and the rest is oxygen. If the molecular\n<\/p>\n<p>               of M is 138, calculate:\n<\/p>\n<ol style=\"margin-left: 54pt\">\n<li>The empirical formula\n<\/li>\n<li>The molecular formula\n<\/li>\n<\/ol>\n<p>\n\u00a0<\/p>\n<p>\n\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 FORM TWO PRE- MOCK EXAMINATIONS CHEMISTRY GOLDEN SECONDARY SCHOOL &#8211;<\/p>\n","protected":false},"author":1,"featured_media":297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-36","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 FORM TWO PRE- MOCK EXAMINATIONS - 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-form-two-pre-mock-examinations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CHEMISTRY FORM TWO PRE- MOCK EXAMINATIONS - 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