{"id":42,"date":"2023-04-01T12:37:19","date_gmt":"2023-04-01T12:37:19","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=42"},"modified":"2023-04-01T11:59:49","modified_gmt":"2023-04-01T11:59:49","slug":"chemistry-2-form-four-madaba-district-mock-examination-2021","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/chemistry-2-form-four-madaba-district-mock-examination-2021\/","title":{"rendered":"CHEMISTRY 2 FORM FOUR MADABA DISTRICT MOCK EXAMINATION-2021"},"content":{"rendered":"

THE UNITED REPUBLIC OF TANZANIA
\n<\/strong><\/span><\/p>\n

PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
\n<\/strong><\/span><\/p>\n

MADABA DISTRICT COUNCIL
\n<\/strong><\/span><\/p>\n

MADABA DISTRICT MOCK EXAMINATION-2021
\n<\/strong><\/span><\/p>\n

032\/2A CHEMISTRY 2 (ACTUAL PRACTICAL) FORM FOUR<\/strong>
\n\t\t<\/span><\/p>\n

TIME 2:30 HOURS 25\/06\/2021AM
\n<\/strong><\/span><\/p>\n

INSTRUCTIONS
\n<\/strong><\/span><\/p>\n

    \n
  1. This paper consists of TWO questions
    \n<\/span><\/li>\n
  2. Answer ALL questions in this paper
    \n<\/span><\/li>\n
  3. In question ONE , an account of the procedure is not required
    \n<\/span><\/li>\n
  4. In question TWO ,credit will be given for precisely recorded observations and for correctly presented inferefences
    \n<\/span><\/li>\n
  5. All answers must be written in black or blue ink EXCEPT for drawings which must be in pencils
    \n<\/span><\/li>\n
  6. You may be allowed to use qualitative analysis quidance shets after the superisor has CERTIFIED that such guidance sheetd have NOT been tempered with
    \n<\/span><\/li>\n
  7. Remember to write your Examination number on every page of your answer sheet provided .
    \n<\/span><\/li>\n
  8. \n
    The following constatnts may be used in your calculations
    \n<\/span><\/div>\n

    Atomic masses : H-1,0=16, S=32, C=12, N=14, Na =23
    \n<\/span><\/p>\n

    1dm3<\/sup>=1litre =1000cm3
    \n<\/sup><\/span><\/p>\n

    \n\u00a0<\/p>\n

      \n
    1. \n
      You are provided with the following solutions,
      \n<\/span><\/div>\n

      Solution AA=contains 3g of acetic acid dissolved in 500cm3<\/sup> of the solution
      \n<\/span><\/p>\n

      Solution BB: Contains sodium hydroxide of unknown concentration
      \n<\/span><\/p>\n

      M.O. Methyl orange
      \n<\/span><\/p>\n

      P.O.P: Phenolphthalein
      \n<\/span><\/p>\n

      Procedures
      \n<\/span><\/p>\n

      Pipettle 20 or 25cm3<\/sup> of solution BB into a conical flask . Add 2-3 drops of suitable indicators of your choice . Titrate this solution with solution AA from the burette until the colour of your change is observed. Repeat this procedure to obtain three other consistent resalts .
      \n<\/span><\/p>\n

      Record our results in a tabular form
      \n<\/span><\/p>\n

      Questions
      \n<\/strong><\/span><\/p>\n

        \n
      1. State the volume of pipette used
        \n<\/span><\/li>\n
      2. Calculate the average volue of solution AA used
        \n<\/span><\/li>\n
      3. Mention the type of Indicator used in this experiment . Give reason for your answer.
        \n<\/span><\/li>\n
      4. What was the colour change of the indicator you have chosen at the end \u2013point of the titration
        \n<\/span><\/li>\n
      5. What is the significance of the colour change when enough AA has been added to solution BB?
        \n<\/span><\/li>\n
      6. Write a balance chemical question eation for the reaction between AA and BB
        \n<\/span><\/li>\n
      7. \n
        Calculate the concentration of BB
        \n<\/span><\/div>\n
          \n
        1. Moles per litre
          \n<\/span><\/li>\n
        2. Grams per litre
          \n<\/span><\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/li>\n
        3. You are provided with a salt EE which has a singule CATION nad ANION perfom the tests below to establish the identify of the salt
          \n<\/span><\/li>\n<\/ol>\n<\/li>\n<\/ol>\n
          \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n
          \n

          TEST <\/strong><\/span><\/p>\n<\/td>\n

          		\n

          OBSERVATION <\/strong><\/span><\/p>\n<\/td>\n

          		\n

          INFERENCE <\/strong><\/span><\/p>\n<\/td>\n<\/tr>\n

          \n
            \n
          1. Appearance of sample EE<\/span><\/li>\n<\/ol>\n<\/td>\n
          		\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
          \n
            \n
          1. Place a spatula of sample EE in a test tube and heat while rotating the test tube . Test for any gas (es) evolved <\/span><\/li>\n<\/ol>\n<\/td>\n
          		\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
          \n
            \n
          1. (i)Place a spatula of sample EE in test tube and add dilute hydrochrolic acid
            \n<\/span><\/li>\n<\/ol>\n

            (ii)Heat the contents of the above test tube and allow to cool to room temperature
            \n<\/span><\/p>\n

            (iii)To the above add concentrate hydrochloric acid <\/span><\/p>\n<\/td>\n

          		\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
          \n

          4(a)Place a spatula of sample EE in attest tube and add dilute nitric acid . Test for the gas (es) evolved <\/span><\/p>\n<\/td>\n

          		\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
          \n

          (b)Divide the resulted solution in two portions
          \n<\/span><\/p>\n

          (i) To one portion add potassium chromate solution
          \n<\/span><\/p>\n

          (ii) To the second portion add potassium iodide solution
          \n<\/span><\/p>\n

          (iii)Warm the contents of the above (second) test tube and then allow to cool <\/span><\/p>\n<\/td>\n

          		\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

          \n\u00a0<\/p>\n

          Conclusion
          \n<\/strong><\/span><\/p>\n

          In sample EE, the cation is \u2026\u2026\u2026\u2026\u2026.. and anion is \u2026\u2026\u2026\u2026\u2026. Usng reaction equations, show that what happened in experiments 2 and 4 (a) above
          \n<\/span><\/p>\n

          Write the banced chemical equations for the reactions in
          \n<\/span><\/p>\n

            \n
          1. Experiment 2
            \n<\/span><\/li>\n
          2. Experiment 4(a) <\/span><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

            THE UNITED REPUBLIC OF TANZANIA PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT MADABA DISTRICT COUNCIL MADABA DISTRICT MOCK EXAMINATION-2021 032\/2A<\/p>\n","protected":false},"author":1,"featured_media":292,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-42","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chemistry","category-uncategorized"],"yoast_head":"\nCHEMISTRY 2 FORM FOUR MADABA DISTRICT MOCK EXAMINATION-2021 - 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-2-form-four-madaba-district-mock-examination-2021\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CHEMISTRY 2 FORM FOUR MADABA DISTRICT MOCK EXAMINATION-2021 - 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