{"id":34,"date":"2023-04-01T11:58:40","date_gmt":"2023-04-01T11:58:40","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=34"},"modified":"2023-04-01T12:00:38","modified_gmt":"2023-04-01T12:00:38","slug":"chemistry-form-joint-examination-assement-2021","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/chemistry-form-joint-examination-assement-2021\/","title":{"rendered":"CHEMISTRY FORM JOINT EXAMINATION ASSEMENT 2021."},"content":{"rendered":"

\n\u00a0<\/p>\n

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

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS
\n<\/span><\/p>\n

CHEMISTRY FORM JOINT EXAMINATION ASSEMENT 2021.
\n<\/span><\/p>\n

\"\"\/TIME: 3:00 HOURS \u00a0\u00a0\u00a0\u00a0STUDENT NAMES:
\n<\/span><\/p>\n

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

1: This paper consists of eight (8) pages with section A, B and C with a total of fourteen (14) questions
\n<\/span><\/p>\n

2: Answer all questions in both sections A and B and ONLY ONE QUESTION FROM SECTION C
\n<\/span><\/p>\n

3: All working must be in blue or black ink except for drawings which must be in pencil.
\n<\/span><\/p>\n

4: Scientific calculator can be allowed in the examination room.
\n<\/span><\/p>\n

5: The following constant may be used.
\n<\/span><\/p>\n

    \n
  1. ATOMIC MASSES : H = 1 C = 12 O = 16 Ca = 40 Mn = 55
    \n<\/span><\/li>\n
  2. GRAM MOLECULAR VOLUME = 22.4dm3<\/sup> AT S.T.P
    \n\t\t\t\t<\/sup><\/span><\/li>\n
  3. 1 FARADAY = 96500 COULOMBS
    \n\t\t\t\t<\/sup><\/span><\/li>\n
  4. \n
    1 LITRE = 1dm3<\/sup> = 1000cm3
    \n<\/sup><\/span><\/div>\n

    FOR EXAMINER’S USE ONLY
    \n<\/span><\/p>\n<\/li>\n<\/ol>\n

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

    QUESTION NUMBER<\/span><\/p>\n<\/td>\n

    		\n

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

    		\n

    EXAMINER’S INITIALS<\/span><\/p>\n<\/td>\n<\/tr>\n

    \n

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    \n\u00a0<\/p>\n

    \n\u00a0<\/p>\n

    \n\u00a0<\/p>\n

    SECTION A (15 MARKS)
    \n<\/strong><\/span><\/p>\n

    1. Choose the most correct answer from among multiple alternatives and write the answer in the answer booklet you have provided.
    \n<\/span><\/p>\n

    i. Which of the following pairs of compounds will give oxides when heated?
    \n<\/span><\/p>\n

      \n
    1. Cu (NO3<\/sub>) and Na2<\/sub> CO3<\/sub>
      \n\t\t\t<\/span><\/li>\n
    2. Zn (NO3<\/sub>)2<\/sub> AND k2<\/sub> CO3<\/sub>
      \n\t\t\t<\/span><\/li>\n
    3. Ca (NO3<\/sub>)2<\/sub> and Cu (NO3<\/sub>)2<\/sub>
      \n\t\t\t<\/span><\/li>\n
    4. \n
      Pb (NO3<\/sub>)2 <\/sub>and AgNO3 <\/sub>
      \n\t\t\t\t<\/span><\/div>\n

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

      ii. Sodium hydroxide was added to three different test tubes, X,Y and Z. blue, green and reddish-brown precipitates were formed, respectively. The metal ions present in test tubes X,Y and Z in the respective are likely to be:
      \n<\/span><\/p>\n

        \n
      1. Ca2+,<\/sup> Pb2+<\/sup> and Al3+<\/sup>
        \n\t\t\t<\/span><\/li>\n
      2. Cu2+<\/sup>, Fe2+<\/sup> and Fe3+<\/sup>
        \n\t\t\t<\/span><\/li>\n
      3. Ag+<\/sup>, Pb2+<\/sup> and Mg2+<\/sup>
        \n\t\t\t<\/span><\/li>\n
      4. \n
        Pb2+, <\/sup>Mg2+<\/sup> and Ca3+<\/sup>
        \n\t\t\t\t<\/span><\/div>\n

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

        iii. Group I elements burn in oxygen to form ______
        \n<\/span><\/p>\n

          \n
        1. Hydroxides
          \n<\/span><\/li>\n
        2. Non-metal oxides
          \n<\/span><\/li>\n
        3. Metal oxides
          \n<\/span><\/li>\n
        4. \n
          Carbon dioxide
          \n<\/span><\/div>\n

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

          iv. Which of the following is not a physical way of separating a mixture?
          \n<\/span><\/p>\n

            \n
          1. Paper chromatography
            \n<\/span><\/li>\n
          2. Filtration
            \n<\/span><\/li>\n
          3. Simple distillation
            \n<\/span><\/li>\n
          4. Melting
            \n<\/span><\/li>\n<\/ol>\n

            V. What number of Faradays of electricity are required to deposit 4 g of calcium from molten calcium chloride?
            \n<\/span><\/p>\n

              \n
            1. 0.1
              \n<\/span><\/li>\n
            2. 0.2
              \n<\/span><\/li>\n
            3. 0.4
              \n<\/span><\/li>\n
            4. \n
              0.3
              \n<\/span><\/div>\n

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

              \n\u00a0<\/p>\n

              vi. What type of fire is associated with electrical equipment?
              \n<\/span><\/p>\n

                \n
              1. Class E
                \n<\/span><\/li>\n
              2. Class F
                \n<\/span><\/li>\n
              3. Class B
                \n<\/span><\/li>\n
              4. Class C
                \n<\/span><\/li>\n<\/ol>\n

                vii. A nitrogen molecule forms covalent bonds. How many electrons are shared between nitrogen atoms?
                \n<\/span><\/p>\n

                  \n
                1. 2 electrons
                  \n<\/span><\/li>\n
                2. 3 electrons
                  \n<\/span><\/li>\n
                3. 6 electrons
                  \n<\/span><\/li>\n
                4. 4 electrons
                  \n<\/span><\/li>\n<\/ol>\n

                  viii. The reaction that can proceed on either direction by changing the condition that governs the reaction is called ______
                  \n<\/span><\/p>\n

                    \n
                  1. Endothermic reaction
                    \n<\/span><\/li>\n
                  2. Displacement reaction
                    \n<\/span><\/li>\n
                  3. Reversible reaction
                    \n<\/span><\/li>\n
                  4. Exothermic reaction
                    \n<\/span><\/li>\n<\/ol>\n

                    ix. Which of the following are primary macronutrients?
                    \n<\/span><\/p>\n

                      \n
                    1. Phosphorus, calcium and potassium.
                      \n<\/span><\/li>\n
                    2. Potassium, calcium and nitrogen
                      \n<\/span><\/li>\n
                    3. Nitrogen, phosphorus and potassium
                      \n<\/span><\/li>\n
                    4. \n
                      Magnesium, calcium and nitrogen.
                      \n<\/span><\/div>\n

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

                      x. The formulae below represent some chemical substances. Which formula represents a substance that does not contribute to global warming?
                      \n<\/span><\/p>\n

                        \n
                      1. H2<\/sub>
                        \n\t\t\t<\/span><\/li>\n
                      2. CH4<\/sub>
                        \n\t\t\t<\/span><\/li>\n
                      3. CO2<\/sub>
                        \n\t\t\t<\/span><\/li>\n
                      4. N2<\/sub>O
                        \n<\/span><\/li>\n<\/ol>\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

                        2. Match list A with their corresponding letter in list B (5MARKS)
                        \n<\/span><\/p>\n

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

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

                        		\n

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

                        \n
                          \n
                        1. Sodium.<\/span><\/li>\n<\/ol>\n<\/td>\n
                        		\n
                          \n
                        1. Blister copper<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n
                        \n
                          \n
                        1. It is used as an anode electrode.<\/span><\/li>\n<\/ol>\n<\/td>\n
                        		\n
                          \n
                        1. Anode electrode.<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n
                        \n
                          \n
                        1. It conducts electricity.<\/span><\/li>\n<\/ol>\n<\/td>\n
                        		\n
                          \n
                        1. Electrolysis.<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n
                        \n
                          \n
                        1. Increases oxidation state.<\/span><\/li>\n<\/ol>\n<\/td>\n
                        		\n
                          \n
                        1. Cathode electrode.<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n
                        \n
                          \n
                        1. Electrons are in left hand side.<\/span><\/li>\n<\/ol>\n<\/td>\n
                        		\n
                          \n
                        1. Graphite electrode.<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

                          \n\u00a0<\/p>\n

                          \n\u00a0<\/p>\n

                          SECTION B (70 MARKS)
                          \n<\/strong><\/span><\/p>\n

                          3 (a) What volume of ethyne measured at S.T.P would be evolved from 32g of 50% pure calcium dicarbide?
                          \n<\/span><\/p>\n

                          (b) Describe how stoichiometry is important in medicine.
                          \n<\/span><\/p>\n

                          \n\u00a0<\/p>\n

                          4. With a well balanced chemical equation explain what will happen for each of the following observation?
                          \n<\/span><\/p>\n

                          (a) Sodium metal is placed in cold water.
                          \n<\/span><\/p>\n

                          (b) A piece of cobalt paper is exposed in air for a while.
                          \n<\/span><\/p>\n

                          (c) Silver nitrate is kept in a colored bottle.
                          \n<\/span><\/p>\n

                          (d) A heated copper oxide is passed over hydrogen gas.
                          \n<\/span><\/p>\n

                          (e) A reaction between lead nitrate with dilute sulphuric acid stops as soon as starts.
                          \n<\/span><\/p>\n

                          (f) Hydrogen sulphide gas is placed in a jar full of sulphur dioxide gas.
                          \n<\/span><\/p>\n

                          (g) A blue litmus paper in ammonia gas.
                          \n<\/span><\/p>\n

                          \n\u00a0<\/p>\n

                          \n\u00a0<\/p>\n

                          \n\u00a0<\/p>\n

                          \n\u00a0<\/p>\n

                          5. (a) What are four constituents of universal indicator?
                          \n<\/span><\/p>\n

                          (b) Two different solutions P and Q into different test tubes were tested using solutions X and Y. On reaction with solution X solution P turns purple and colorless on reaction with solution Q. But on reaction with solution Y solution P turns yellow and finally pink on reaction with solution Q.
                          \n<\/span><\/p>\n

                            \n
                          1. Identify solutions P and Q.
                            \n<\/span><\/li>\n
                          2. State one example of solution P and Q
                            \n<\/span><\/li>\n
                          3. \n
                            Identify solutions X and Y.
                            \n<\/span><\/div>\n

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

                            6 (a) Permanent hardness of water is the type of water that cannot be removed by boiling. Explain
                            \n<\/span><\/p>\n

                            (b) Is water a mixture of hydrogen and oxygen? Give four reasons to support your answer.
                            \n<\/span><\/p>\n

                            \n\u00a0<\/p>\n

                            7(a<\/span> Copper obtained during extraction process is known as a Blister copper which is impure one. It is purified through electrolysis is to obtain pure copper.
                            \n<\/span><\/span><\/p>\n

                              \n
                            1. Name the electrolyte used to purify impure copper
                              \n<\/span><\/li>\n
                            2. Name the nature of electrode used.
                              \n<\/span><\/li>\n<\/ol>\n

                              (b) Consider the electroplating of a spoon using a silver metal
                              \n<\/span><\/p>\n

                                \n
                              1. Name the type of electrolyte that can be used
                                \n<\/span><\/li>\n
                              2. At which electrode a spoon will be placed?
                                \n<\/span><\/li>\n
                              3. Draw a well labeled diagram to represent this information process.
                                \n<\/span><\/li>\n
                              4. Write down the ionic equations at each electrode.
                                \n<\/span><\/li>\n<\/ol>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                8(a) Describe four human activities that cause air pollutants.
                                \n<\/span><\/p>\n

                                (b) The prevention of using plastic bags plays a great role to our environment. Write three advantages of stopping the use of plastic bags to the environment.
                                \n<\/span><\/p>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                \n\u00a0<\/p>\n

                                \"\"\/9. Study the fgure given below then answer the questions that fol
                                \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
                                1. Label subastances A, B and C
                                  \n<\/span><\/li>\n
                                2. Write a well banaced chemical equation for the preparation of gas C
                                  \n<\/span><\/li>\n
                                3. State the role of B and concentrated sulphuric acid.
                                  \n<\/span><\/li>\n
                                4. What will happen when green leaves are placed in a jar of gas C? Explain
                                  \n<\/span><\/li>\n<\/ol>\n

                                  10
                                  \n<\/span><\/p>\n

                                  \n\u00a0<\/p>\n

                                  11. Sulphuric acid is prepared by contact process. During the catalytic conversion of sulphur dioxide to sulphur trioxide equilibrium is established.
                                  \n<\/span><\/p>\n

                                  (a) Show the catalytic conversion process with a well-balanced chemical equation.
                                  \n<\/span><\/p>\n

                                  (b) State the role of a catalyst used in this process.
                                  \n<\/span><\/p>\n

                                  (c) Show how temperature and pressure would increase the production of sulphur trioxide.
                                  \n<\/span><\/p>\n

                                  (d) Explain why is it unfavorable to work with very low temperature and high pressure in this process?
                                  \n<\/span><\/p>\n

                                  \n\u00a0<\/p>\n

                                  12(a) Determine the empirical formula of a substance that has the following composition by mass:
                                  \n<\/span><\/p>\n

                                  49.5% manganese and 50.5% oxygen.
                                  \n<\/span><\/p>\n

                                  \n\u00a0<\/p>\n

                                  (b) An isotope of neon has a mass number of 21 and an atomic number of 10
                                  \n<\/span><\/p>\n

                                    \n
                                  1. Write its nuclide notation
                                    \n<\/span><\/li>\n
                                  2. How many neutrons does it have?
                                    \n<\/span><\/li>\n
                                  3. How many electrons does it have?
                                    \n<\/span><\/li>\n
                                  4. Explain why an atom is electrically neutral
                                    \n<\/span><\/li>\n<\/ol>\n

                                    \n\u00a0<\/p>\n

                                    \n\u00a0<\/p>\n

                                    SECTION C (15 MARKS)
                                    \n<\/strong><\/span><\/p>\n

                                    13. On reaction with water gas R produces solution S (C2<\/sub>H5<\/sub>OH). When R reacted with oxygen in the presence of potassium permanganate produces solution T. On reaction with U solution T produces substance solution V with liquid W. When solution V reacted with alkaline solution X gave gas Y which produces tetrachloro methane on reaction with chlorine gas in the presence of sunlight.
                                    \n<\/span><\/p>\n

                                    (a) Identify substance R, T, U, V, X \u00a0\u00a0\u00a0\u00a0and Y
                                    \n<\/span><\/p>\n

                                    (b) Show all chemical reactions involved in each step.
                                    \n<\/span><\/p>\n

                                    \n\u00a0<\/p>\n

                                    14. With a critical reason explain what will happen for each of the following phenomenon.
                                    \n<\/span><\/p>\n

                                    (a) Magnesium sulphate solution is added into a test tube contains sodium carbonate solution.
                                    \n<\/span><\/p>\n

                                    (b) Potassium iodide solution mixed with lead carbonate solution.
                                    \n<\/span><\/p>\n

                                    (c) Manganese (iv) oxide solid was added in a solution of sodium chloride then heated gently.
                                    \n<\/span><\/p>\n

                                    (d) Barium nitrate solution together with dilute nitric acid was added into a lead sulphate solution.
                                    \n<\/span><\/p>\n

                                    (e) A concentrated sulphuric acid was added in a mixture of ferrous sulphate with copper nitrate solution.
                                    \n<\/span><\/p>\n

                                    \n\u00a0<\/p>\n

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

                                    \u00a0 THE PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS CHEMISTRY FORM JOINT EXAMINATION ASSEMENT 2021. TIME: 3:00 HOURS \u00a0\u00a0\u00a0\u00a0STUDENT NAMES:<\/p>\n","protected":false},"author":1,"featured_media":348,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-34","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chemistry","category-uncategorized"],"yoast_head":"\nCHEMISTRY FORM JOINT EXAMINATION ASSEMENT 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-form-joint-examination-assement-2021\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CHEMISTRY FORM JOINT EXAMINATION ASSEMENT 2021. - MAKTABA EDUCATION CENTER\" \/>\n<meta property=\"og:description\" content=\"\u00a0 THE PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS CHEMISTRY FORM JOINT EXAMINATION ASSEMENT 2021. 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