{"id":3948,"date":"2023-10-06T08:18:32","date_gmt":"2023-10-06T08:18:32","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=3948"},"modified":"2023-10-06T08:19:51","modified_gmt":"2023-10-06T08:19:51","slug":"week-8-ss3-second-term-chemistry-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-8-ss3-second-term-chemistry-notes\/","title":{"rendered":"Week 8 – SS3 Second Term Chemistry Notes"},"content":{"rendered":"

\u00a0WEEK EIGHT
\n<\/strong>Test for Anions,
\nIdentification of gases e.g CO2<\/sub>, SO2<\/sub> and O2<\/sub>.
\nCharacteristics test for anions e.g SO4<\/sub>2-<\/sup>,SO3<\/sub>2-<\/sup>,CO3<\/sub>2-<\/sup>,NO-3<\/sup>, Cl–<\/sup>, etc.
\nThe anions are negatively change ions examples of anions are SO4<\/sub>2-<\/sup>,SO3<\/sub>2-<\/sup>,CO3<\/sub>2<\/sup>-,S2-<\/sup> etc.<\/p>\n

\u00a0Identification of Gases
\n<\/strong>\u00a0\u00a0\u00a0\u00a0Gases\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0identification
\n\"\"\/1.\u00a0\u00a0\u00a0\u00a0H2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0It gives a ‘pop’ sound when the gas is contact with a lighted splint.
\n2.\u00a0\u00a0\u00a0\u00a0O2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0It rekindles a glowing splint.
\n3.\u00a0\u00a0\u00a0\u00a0CO2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0It is colourless and odourless. It turns lime water milky.
\n4.\u00a0\u00a0\u00a0\u00a0Cl2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0A green wish yellow gas, it turns moist iodide paper black.
\n5.\u00a0\u00a0\u00a0\u00a0SO2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Colourless gas with irritating smell. It turns damp blue litmus paper to red. That
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0is acidic gas.<\/p>\n

\u00a0EVALUATION<\/strong><\/p>\n

    \n
  1. State two (2) examples of anions with their gases.\n<\/li>\n
  2. Identify Cl2<\/sub> and NH3<\/sub> gases.\n<\/li>\n<\/ol>\n

    \u00a0Test For Anions
    \n<\/strong>Test for SO4<\/sub>2-
    \n<\/sup><\/strong>\"\"\/Test\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Observation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Inferences
    \nSample +H2<\/sub>O\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dissolve in water\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0soluble
    \nSoln +Bacl2<\/sub>+\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0white ppt\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO4<\/sub>2-<\/sup>, SO3<\/sub>2-<\/sup>,CO3<\/sub>2-<\/sup>
    \n\t\tDil HCl\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ppt insoluble\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO4<\/sub>2-<\/sup>, confirmed.
    \n\"\"\/Soln + dil HCl\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0No visible reaction\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO3<\/sub>2-<\/sup>,CO3<\/sub>2-<\/sup>,S2-<\/sup> are absent
    \n\"\"\/Soln + Bacl2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0white precipitate\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO4<\/sub>2-<\/sup>, confirmed <\/p>\n

    \u00a0Test for SO3<\/sub>2-<\/sup>
    \n\t\t\t<\/strong>Soln+Bacl2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0white precipitate
    \n+ dil HCl\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dissolve in dil HCl\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO3<\/sub>2-<\/sup> or CO3<\/sub>2-<\/sup>
    \n\t\t\"\"\/soln+acidified\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0decolourise the purple
    \nsoln of KMnO4<\/sub>\u00a0\u00a0\u00a0\u00a0colour to colourless\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO3<\/sub>2-<\/sup> confirmed
    \n\"\"\/soln +\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0the orange colour change\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO3<\/sub>2-<\/sup> confirmed
    \nacidified K2<\/sub>Cr2<\/sub>O7\u00a0\u00a0\u00a0\u00a0<\/sub>to green (reducing property)\u00a0\u00a0\u00a0\u00a0
    \n\"\"\/
    \n\t\tTest for CO3<\/sub>2-<\/sup>
    \n\t\t\t<\/strong>\"\"\/Soln+dil HCl\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Effervescence occurred and a \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO3<\/sub>2-<\/sup>,CO3<\/sub>2-<\/sup>, S2-<\/sup>
    \n\t\t\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Colourless gas is librated \u00a0\u00a0\u00a0\u00a0may be present
    \n\"\"\/Gas+litmus paper\u00a0\u00a0\u00a0\u00a0it changes moist blue litmus paper\u00a0\u00a0\u00a0\u00a0acidic gas
    \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0To red.
    \n\"\"\/Gas + lime water\u00a0\u00a0\u00a0\u00a0The gas turned lime\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0gas is CO2<\/sub> from CO3<\/sub>2-
    \n<\/sup>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Water milky.
    \n\"\"\/
    \n\t\t\"\"\/Test for S2-<\/sup><\/strong>
    \n\t\tTest \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Observation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Inferences
    \n\"\"\/Soln + dil HCl\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0A colourless gas evolved\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0H2<\/sub>S gas from S2-<\/sup>
    \n\t\t\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0With rotten egg smell
    \n\"\"\/Gas +KMnO4<\/sub> soln\u00a0\u00a0\u00a0\u00a0purple colour is decolourised
    \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0With a deposit of sulphur\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0S2-<\/sup> present
    \n\"\"\/
    \n\t\tTest for Cl–<\/sup><\/strong>
    \n\t\t\"\"\/Soln + dil HNO3<\/sub>\u00a0\u00a0\u00a0\u00a0No visible reaction\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SO3<\/sub>2-<\/sup> or CO3<\/sub> are absent
    \n\"\"\/Soln + AgNO3<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0white precipitate\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Cl- present
    \n\"\"\/
    \n\t\tGENERAL EVALUATION
    \n<\/strong><\/p>\n

      \n
    1. Give the common reagents for confirmatory test of anions\n<\/li>\n
    2. State how you would confirm\/test for NO3-<\/sup>\n\t\t\t<\/li>\n
    3. Name three gases that are colourless and acidic to litmus.\n<\/li>\n
    4. Sodium chloride and silver trioxonitrate(V) crystals are separately soluble in water to give colourless solutions. Explain what happens when their solutions are mixed together.\n<\/li>\n<\/ol>\n

      \u00a0READING ASSIGNMENT
      \n<\/strong>School Chemstry by O.Y Ababio pages 165 \u2013 183
      \nPractical Chemistry by R. I Makanjuola pages 27-33.
      \nPractical Chemistry for Schools and Colleges by Godwin O. Ojokuku pages 30 \u2013 98.<\/p>\n

      \u00a0WEEKEND ASSIGNMENT
      \n<\/strong><\/p>\n

        \n
      1. Brown ring test is used to confirm (a) S2-<\/sup> (b)NO3-<\/sup> (c) SO4<\/sub>2-<\/sup> (d) SO3<\/sub>2-<\/sup>\n\t\t\t<\/li>\n
      2. The presence of SO3<\/sub>2-<\/sup> change the colour of acidified K2<\/sub>Cr2<\/sub>)7<\/sup> from (a) green to red\u00a0\u00a0\u00a0\u00a0(b) purple to colourless (c) orange to green (d) green to orange\n<\/li>\n
      3. A greenish yellow gas that change moist iodide paper black is (a) Cl2<\/sub>\u00a0\u00a0\u00a0\u00a0(b) SO2<\/sub>\u00a0\u00a0\u00a0\u00a0 (c) H2<\/sub>\u00a0\u00a0\u00a0\u00a0(d) O2<\/sub>\n\t\t\t<\/li>\n
      4. Sometimes in the presence of conc HsSO4<\/sub>, copper turning and heat NO3-<\/sup> gives (a) brown ring\u00a0reaction (b) pure brown fume (c ) reddish brown (d) effervescence \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n<\/li>\n
      5. The gas that turns lime water milky is (a) H2<\/sub> (b) SO2<\/sub> (c) NH3<\/sub> (d) CO2<\/sub>.\n<\/li>\n<\/ol>\n

        \u00a0THEORY<\/strong><\/p>\n

          \n
        1. State the colour of these solutions a. KMnO4<\/sub> b. K2<\/sub>Cr2<\/sub>O3<\/sub> c. HOBr d. CuSO4<\/sub>.5H2<\/sub>O e. Ca(OH)2<\/sub>\n\t\t\t<\/li>\n
        2. \n
          Carry out the following exercises on sample K. add about 10cm3 of distilled water to K in a test tube. Divide the solution into four.\n<\/div>\n
            \n
          1. To the 1st<\/sup> portion add NaOH drop wise and in excess.\n<\/li>\n
          2. To the 2nd<\/sup> portion add NH3<\/sub> solution drop wise and then in excess.\n<\/li>\n
          3. To the 3rd<\/sup> portion, add it drops of BaCl2 follow by the addition of dil HCl\n<\/li>\n
          4. To the 4th<\/sup> portion, add dil HCl follow by the addition of BaCl2<\/sub>.\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

            Record your observation and inferences then name the salt K.<\/p>\n","protected":false},"excerpt":{"rendered":"

            \u00a0WEEK EIGHT Test for Anions, Identification of gases e.g CO2, SO2 and O2. Characteristics test…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,307],"tags":[],"class_list":["post-3948","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-ss3-chemistry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=3948"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3948\/revisions"}],"predecessor-version":[{"id":3949,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3948\/revisions\/3949"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=3948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=3948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=3948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}