{"id":32,"date":"2023-04-01T12:33:58","date_gmt":"2023-04-01T12:33:58","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=32"},"modified":"2023-04-01T12:24:51","modified_gmt":"2023-04-01T12:24:51","slug":"chemistry-1-form-four-mock-examination-kilimanjaro-marking-scheme","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/chemistry-1-form-four-mock-examination-kilimanjaro-marking-scheme\/","title":{"rendered":"CHEMISTRY 1 FORM FOUR MOCK EXAMINATION, KILIMANJARO MARKING SCHEME"},"content":{"rendered":"

THE PRESIDENT’S OFFICE
\n<\/strong><\/span><\/p>\n

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
\n<\/strong><\/span><\/p>\n

KILIMANJARO REGIONAL COMMISSIONER’S OFFICE
\n<\/strong><\/span><\/p>\n

FORM FOUR MOCK EXAMINATION
\n<\/strong><\/span><\/p>\n

CHEMISTRY 1 MARKING SCHEME
\n<\/strong><\/span><\/p>\n

\n\u00a0<\/p>\n

01.
\n<\/span><\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n<\/colgroup>\n\n\n\n
\n

i<\/span><\/p>\n<\/td>\n

\n

ii<\/span><\/p>\n<\/td>\n

\n

iii<\/span><\/p>\n<\/td>\n

\n

iv<\/span><\/p>\n<\/td>\n

\n

v<\/span><\/p>\n<\/td>\n

\n

vi<\/span><\/p>\n<\/td>\n

\n

vii<\/span><\/p>\n<\/td>\n

\n

viii<\/span><\/p>\n<\/td>\n

\n

ix<\/span><\/p>\n<\/td>\n

\n

x<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

B<\/span><\/p>\n<\/td>\n

\n

C<\/span><\/p>\n<\/td>\n

\n

D<\/span><\/p>\n<\/td>\n

\n

D<\/span><\/p>\n<\/td>\n

\n

D<\/span><\/p>\n<\/td>\n

\n

E<\/span><\/p>\n<\/td>\n

\n

B<\/span><\/p>\n<\/td>\n

\n

D<\/span><\/p>\n<\/td>\n

\n

A<\/span><\/p>\n<\/td>\n

\n

E<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

1mark@ = 10 marks
\n<\/span><\/p>\n

\n\n\n\n\n\n\n<\/colgroup>\n\n\n\n
\n

i<\/span><\/p>\n<\/td>\n

\n

ii<\/span><\/p>\n<\/td>\n

\n

iii<\/span><\/p>\n<\/td>\n

\n

iv<\/span><\/p>\n<\/td>\n

\n

v<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

D<\/span><\/p>\n<\/td>\n

\n

G<\/span><\/p>\n<\/td>\n

\n

E<\/span><\/p>\n<\/td>\n

\n

C<\/span><\/p>\n<\/td>\n

\n

F<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

02.
\n<\/span><\/p>\n

    \n
  • \n\t\t<\/li>\n<\/ul>\n

    1mark @ = 05 marks
    \n<\/span><\/p>\n

    03.a)i) Close the air hole and Connect the burner to the gas using a rubber tubing
    \n<\/span><\/p>\n

    ii) Light the match and hold it at the top of the chimney
    \n<\/span><\/p>\n

    iii) Open the gas slowly to half way then to fully open position
    \n<\/span><\/p>\n

    iv) Open the air holes slowly after the gas is lit
    \n<\/span><\/p>\n

    (1 Marks@=4 Marks)
    \n<\/span><\/p>\n

    (b) i) It is transparent and do not corrode by chemicals
    \n<\/span><\/p>\n

    ii) They prevent soaking of water.
    \n<\/span><\/p>\n

    (1marks@ = 2marks)
    \n<\/span><\/p>\n

    (c) Because small change in volume can show large difference in volume. (1 mark)
    \n<\/span><\/p>\n

    \n\u00a0<\/p>\n

    4.(a) When we breath in carbon (ii) oxide, combines with haemoglobin form carbonyl haemoglobin that do not release oxygen to the body cell hence living cells lacks oxygen as a result a person may die. (03 marks).
    \n<\/span><\/p>\n

    (b) i) Water
    \n<\/span><\/p>\n

    ii) Sand
    \n<\/span><\/p>\n

    iii) Foam
    \n<\/span><\/p>\n

    (@1 mark = 3 marks)
    \n<\/span><\/p>\n

    (c) Fire class A (01 mark)
    \n<\/span><\/p>\n

    \n\u00a0<\/p>\n

    5.(a) i) Due to presence of delocalized electrons that are free to move.
    \n<\/span><\/p>\n

    ii) When high voltage of electric current is passed through it gives characteristic colour
    \n<\/span><\/p>\n

    iii) Water is plenty and accessible than any other component in first aid kit.
    \n<\/span><\/p>\n

    iv) Filtration is slow process but centrifuge separate quickly solid from liquid.
    \n<\/span><\/p>\n

    v) Heat and moisture from the exhaust increase the rate of reaction where by accelerate rusting
    \n<\/span><\/p>\n

    (1mark@ = 5 marks)
    \n<\/span><\/p>\n

    (b) Solution
    \n<\/span><\/p>\n

    1 mole of ammonia occupies 22.4dm3<\/sup> at STP.
    \n<\/span><\/p>\n

    X moles occupies 22.4dm3<\/sup>at STP.
    \n<\/span><\/p>\n

    i.e.
    \n<\/span><\/p>\n

    1mole = 22.4dm3<\/sup>
    \n\t\t<\/span><\/p>\n

    X =22.4dm3<\/sup>
    \n\t\t<\/span><\/p>\n

    X = 2.24<\/span>mol\/dm3<\/sup>
    \n\t\t<\/span><\/p>\n

    22.4dm3<\/sup>
    \n\t\t<\/span><\/p>\n

    = 0.1mol.
    \n<\/span><\/p>\n

    (01mark)
    \n<\/span><\/p>\n

    \"\"\/Consider equation
    \n<\/span><\/p>\n

    \"\"\/\"\"\/\"\"\/N2<\/sub>(g) + 3H2<\/sub>g 2NH3<\/sub>(g)
    \n<\/span><\/p>\n

    Mole ration is 1:2.
    \n<\/span><\/p>\n

    The number of moles of N2 required is given by
    \n<\/span><\/p>\n

    o.1 mol x 1<\/span> = 0.05mol.
    \n<\/span><\/p>\n

    2
    \n<\/span><\/p>\n

    Therefore 0.05 moles of Nitrogen gas required to produce 2.24dm3<\/sup> of ammonia at STP.
    \n<\/span><\/p>\n

      \n
    1. ark)
      \n<\/span><\/li>\n<\/ol>\n

      6.(a) i) Finely divided iron (01 mark)
      \n<\/span><\/p>\n

      ii) Hydrogen \u2013 obtained from electrolysis of water or natural gas (01 mark)
      \n<\/span><\/p>\n

      nitrogen; obtained from air by fractional distillation of liquid air (01 mark)
      \n<\/span><\/p>\n

      (b) i) Reaction moves forward because it is exothermic
      \n<\/span><\/p>\n

      ii) Reaction moves forward (01 mark)
      \n<\/span><\/p>\n

      (C) Le Chatelier’s principle. (01 mark)
      \n<\/span><\/p>\n

      “When a system in equilibrium subjected to a change the position of equilibrium will change so as to eliminate effect of change” (01 mark)
      \n<\/span><\/p>\n

      \n\u00a0<\/p>\n

      \n\u00a0<\/p>\n

      \n\u00a0<\/p>\n

      \n\u00a0<\/p>\n

      \n\u00a0<\/p>\n

      \n\u00a0<\/p>\n

      7.(i) 20 ( 01 mark )
      \n<\/span><\/p>\n

      \"\"\/\"\"\/
      \n\t\t<\/span><\/p>\n

      \"\"\/\"\"\/\"\"\/\"\"\/\"\"\/ii) x
      \n<\/span><\/p>\n

      \"\"\/\"\"\/
      \n\t\t<\/span><\/p>\n

      \"\"\/
      \n\t\t<\/span><\/p>\n

      \"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/\"\"\/
      \n\t\t<\/span><\/p>\n

      (2marks)
      \n<\/span><\/p>\n

      \n\u00a0<\/p>\n

      \"\"\/\"\"\/\"\"\/\"\"\/
      \n\t\t<\/span><\/p>\n

      \"\"\/\u00a0\u00a0\u00a0\u00a0
      \n<\/span><\/p>\n

      \n\u00a0<\/p>\n

      iii) Atomic mass = 40 (01 mark)
      \n<\/span><\/p>\n

      7.(b) (i) Sulphur dioxide. (01 mark)
      \n<\/span><\/p>\n

      \"\"\/ (ii) Na<\/span>2<\/span>SO<\/span>3 + 2<\/span> HCl NaCl + SO<\/span>2<\/span> + S + H<\/span>2<\/span>O (1 Mark)
      \n<\/span><\/span><\/p>\n

      (iii) dissolve rain water forming sulphurous acid that pollute the environment.
      \n<\/span><\/p>\n

      (01 mark)
      \n<\/span><\/p>\n

      8(a)
      \n<\/span><\/p>\n

      \n\n\n\n\n<\/colgroup>\n\n\n\n\n
      \n

      Compound <\/span><\/p>\n<\/td>\n

      		\n

      cation <\/span><\/p>\n<\/td>\n

      		\n

      anion<\/span><\/p>\n<\/td>\n<\/tr>\n

      \n

      Pb (NO3<\/sub>)2 <\/sub><\/span><\/p>\n<\/td>\n

      		\n

      Pb2+ <\/sup><\/span><\/p>\n<\/td>\n

      		\n

      NO3<\/sub>–<\/sup><\/span><\/p>\n<\/td>\n<\/tr>\n

      \n

      K2<\/sub>MnO4<\/sub>
      \n\t\t\t\t\t\t\t<\/span><\/p>\n<\/td>\n

      		\n

      K+<\/sup>
      \n\t\t\t\t\t\t\t<\/span><\/p>\n<\/td>\n

      		\n

      MnO4<\/sub>2-<\/sup><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

      \n\u00a0<\/p>\n

      (1mark@ = 4 marks)
      \n<\/span><\/p>\n

      (b) concentration
      \n<\/span><\/p>\n

      Roasting
      \n<\/span><\/p>\n

      Smelting
      \n<\/span><\/p>\n

        \n
      1. mark @ = 3 marks)
        \n<\/span><\/li>\n<\/ol>\n

        \n\u00a0<\/p>\n

        \n\u00a0<\/p>\n

        \n\u00a0<\/p>\n

        \n\u00a0<\/p>\n

        9. (a) Uses of matter
        \n<\/span><\/p>\n

          \n
        • Matter used for transportation example water
          \n<\/span><\/li>\n
        • Matter used for construction e.g. Bricks
          \n<\/span><\/li>\n
        • \n
          Matter used for photosynthesis example carbon dioxides
          \n<\/span><\/div>\n

          (3pts = 3 marks)
          \n<\/span><\/p>\n

          \n\u00a0<\/p>\n<\/li>\n<\/ul>\n

          (b) Simplify communication
          \n<\/span><\/p>\n

          – Enable learners to understand elements quickly (02 marks)
          \n<\/span><\/p>\n

          \n\u00a0<\/p>\n

          (c)Using unhydrous copper (II) Sulphate
          \n<\/span><\/p>\n

          Using cobalt chloride
          \n<\/span><\/p>\n

            \n
          1. arks@ = 2marks)
            \n<\/span><\/li>\n<\/ol>\n

            10.(i) Cathode \u2013 Hydrogen (01 mark)
            \n<\/span><\/p>\n

            Anode – Oxygen
            \n<\/span><\/p>\n

            \n\u00a0<\/p>\n

            (ii)
            \n<\/span><\/p>\n

            \"\"\/
            \n\t\t<\/span><\/p>\n

            \"\"\/\"\"\/\"\"\/
            \n\t\t<\/span><\/p>\n

            \"\"\/\"\"\/\"\"\/
            \n\t\t<\/span><\/p>\n

            \n\u00a0<\/p>\n

            \"\"\/\"\"\/\"\"\/\"\"\/\"\"\/
            \n\t\t<\/span><\/p>\n

            \"\"\/ (02 Marks)
            \n<\/span><\/p>\n

            \n\u00a0<\/p>\n

            (iii) At anode
            \n<\/span><\/p>\n

            \"\"\/ 4 OH–<\/sup> 2H<\/span>2<\/span>O + O2 <\/sub>+ 4 e–<\/sup>
            \n\t\t\t<\/span><\/span><\/p>\n

            At cathode
            \n<\/span><\/p>\n

            \"\"\/2 H+<\/sup>(aq) + 2e–<\/sup> H<\/span>2<\/span>(g)
            \n<\/span><\/span><\/p>\n

            Number of moles of oxygen
            \n<\/span><\/p>\n

            \"\"\/ 4 mole of e = 1Mol of O2<\/sub>
            \n\t\t<\/span><\/p>\n

            0.02 Mol =?
            \n<\/span><\/p>\n

            \"\"\/\"\"\/\"\"\/\"\"\/\"\"\/ = 0.02 x 1= 0.005mol. (1.5 marks)
            \n<\/span><\/p>\n

            4
            \n<\/span><\/p>\n

            Number of mole of H<\/span>2
            \n<\/span><\/span><\/p>\n

            \"\"\/\"\"\/2 Mols of e = 1 Mol of H2
            \n<\/span><\/span><\/p>\n

            0.02 Mol = x\"\"\/
            \n\t\t<\/span><\/p>\n

            = 0.01 Mol (1.5 Marks)<\/span>
            \n\t\t<\/span><\/p>\n

            \n\u00a0<\/p>\n

            \n\u00a0<\/p>\n

            \n\u00a0<\/p>\n

              \n
            1. (a) Diamond
              \n<\/span><\/li>\n<\/ol>\n

              Graphite
              \n<\/span><\/p>\n

              Amorphous
              \n<\/span><\/p>\n

              (1mark @)
              \n<\/span><\/p>\n


              \n\t\t\t<\/span>b) Carbon dioxide turns lime water milky
              \n<\/span><\/span><\/p>\n

              \"\"\/ c) Na2<\/sub>S2<\/sub>O3(aq) <\/sub>+ 2HCl(aq)<\/sub> \u00a0\u00a0\u00a0\u00a0 2NaCl(aq)<\/sub> + SO2(g)<\/sub> + S(s)<\/sub> + H2<\/sub>O(l) <\/sub>(01 mark)
              \n<\/span><\/p>\n

              \"\"\/\"\"\/ 2Na(aq)<\/sub>+<\/sup> + S2<\/sub>O3(aq)<\/sub>2-<\/sup>+ 2H+<\/sup> + 2Cl– <\/sup> 2Na+<\/sup> (aq)<\/sub> + 2Cl–<\/sup>(aq)<\/sub> + SO2(g)<\/sub> +S(s)<\/sub> + H2<\/sub>O(l)<\/sub><\/span>
              \n\t\t\t<\/span><\/span><\/p>\n

              \"\"\/
              \n\t\t\t<\/span>S2<\/sub>O3<\/sub>2-<\/sup>(aq)<\/sub>
              \n\t\t\t\t<\/sup>+ 2H+<\/sup>(aq)<\/sub> SO2(s)<\/sub> + S(s)<\/sub> + H2<\/sub>O(l)<\/sub> (02 marks<\/span>)
              \n<\/span><\/span><\/p>\n

              12.(a) Alkyl group; is hydrocarbon with one hydrogen atom removed.( 01 Mark)
              \n<\/span><\/p>\n

              (b) i) CnH2n+2<\/sub>
              \n\t\t<\/span><\/p>\n

              ii) Cn<\/sub>H2n<\/sub>
              \n\t\t<\/span><\/p>\n

              iii) Cn<\/sub>H2n+1<\/sub>OH (01 mark@)
              \n<\/span><\/p>\n

              c) i) 8- chlorohept 3-yne.
              \n<\/span><\/p>\n

              ii) 3, 3-dimethylbutan-2-ol
              \n<\/span><\/p>\n

              iii) Butane (01 mark @)
              \n<\/span><\/p>\n

              13. Meaning of environmental degradation (1.5 marks)
              \n<\/span><\/p>\n

              Measures to minimize environmental degradation( any 6 pts @ 2marks)
              \n<\/span><\/p>\n

                \n
              • Lower impact mining technique
                \n<\/span><\/li>\n
              • Use of eco- friendly equipment
                \n<\/span><\/li>\n
              • Reusing mining waste
                \n<\/span><\/li>\n
              • Shutting illegal mining
                \n<\/span><\/li>\n
              • Rehabilitating mining sites.
                \n<\/span><\/li>\n
              • \n
                Improving mining sustainability
                \n<\/span><\/div>\n

                Conclusion 1.5 marks
                \n<\/span><\/p>\n<\/li>\n<\/ul>\n

                14.meaning of soil fertility (1.5 marks)
                \n<\/span><\/p>\n

                Importance of soil fertility (6 points @ 2marks)
                \n<\/span><\/p>\n

                  \n
                • Provide nutrient to the plants
                  \n<\/span><\/li>\n
                • Provides support
                  \n<\/span><\/li>\n
                • Prevents plants from diseases
                  \n<\/span><\/li>\n
                • Provides support to the plant
                  \n<\/span><\/li>\n
                • Ensure high yield
                  \n<\/span><\/li>\n
                • Improve soil aeration
                  \n<\/span><\/li>\n<\/ul>\n

                  Conclusion (1.5 marks)
                  \n<\/span><\/p>\n

                  \n\u00a0<\/p>\n

                  \n\u00a0<\/p>\n

                  \n\u00a0<\/p>\n


                  \n\t\t<\/span>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

                  THE PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT KILIMANJARO REGIONAL COMMISSIONER’S OFFICE FORM FOUR MOCK EXAMINATION CHEMISTRY 1 MARKING SCHEME<\/p>\n","protected":false},"author":1,"featured_media":296,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-32","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chemistry","category-uncategorized"],"yoast_head":"\nCHEMISTRY 1 FORM FOUR MOCK EXAMINATION, KILIMANJARO MARKING SCHEME - 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-1-form-four-mock-examination-kilimanjaro-marking-scheme\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CHEMISTRY 1 FORM FOUR MOCK EXAMINATION, KILIMANJARO MARKING SCHEME - 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