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picture1_Pdf Printable Periodic Table 195009 | 6 The Periodic Table Ms Igcse Cie Chemistry Extended Theory Paper


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File: Pdf Printable Periodic Table 195009 | 6 The Periodic Table Ms Igcse Cie Chemistry Extended Theory Paper
www igexams com the periodic table mark scheme 6 level igcse subject chemistry examboard cie topic the periodic table sub topic paper extended theory booklet mark scheme 6 timeallowed 72 ...

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                                   The Periodic Table 
                                            Mark Scheme 6
                 Level                                        IGCSE 
                 Subject                                      Chemistry 
                 ExamBoard                                    CIE 
                 Topic                                        The Periodic Table 
                 Sub-Topic 
                 Paper                                         (Extended) Theory 
                 Booklet                                      Mark Scheme 6
                 TimeAllowed:                72 minutes
                 Score:                       / 60
                 Percentage:                  /100 
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                                      1                                                                                                                                                                                               
                                                    (a            (i) (particles) spread to fill total available volume/move from high concentration
                                                                                                                                                    
                                                                                to low concentration/moves down a concentration gradient  (1)                                                                                                                                                                                                                      [1] 
                                                                (ii)            mass or M   (1)                                                                                                                                                                                                                                                                    [1] 
                                                                                                                 r                
                                                                                                                              
                                                    (b)b)                       helium atoms/molecules are lighter than molecules in air or N  and O
                                                                                                                                                                                                                                                                                     2                        2
                                                                                or helium is less dense than air or N  and O .
                                                                                                                                                                                                   2                        2
                                                                                or helium diffuses (through the porous barrier) faster than air or N  and
                                                                                                                                                                                                                                                                                                                   2
                                                                                O.  (1)                                                                                                                                                                                                                                                                            [1]
                                                                                     2
                                                                  (ii)           faster rate of diffusion   
                                                                                                                                                        / molecules move faster (at high temperatures).  (1)                                                                                                                                                         [1] 
                                                     (c) (i) CH   +  2O     CO   +  2H O  (1)                                                                                                                                                                                                                                                                       [1] 
                                                                                            4                       2                            2                       2
                                                                  (ii)           would get a mixture of helium and carbon dioxide
                                                                                 or would get a mixture of gases
                                                                                                                                                                                               
                                                                                 or waste of methane/natural gas/fossil fuel  (1)                                                                                                                                                                                                                                    [1] 
                                                                (iii)            fractional distillation  (1)                                                                                                                                                                                                                                                        [1] 
                                                                                                                                                                                                                                                                                                                                           [Total: 7] 
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           2 (a Any one of:
                   Fe O  + 3C  2Fe + 3CO
                      2 3
                   2Fe O  + 3C  4Fe + 3CO
                       2 3                  2
                   Fe O  + 3CO  2Fe + 3CO
                      2 3                    2 
                   for correct equation (2)
                   not balanced = (1) only
                   any four of:
                   coke burns to form carbon dioxide / C + O   CO
                                                          2      2
                   this reacts with more carbon to form carbon monoxide / C + CO   2CO
                                                                              2
                   calcium carbonate decomposes to form calcium oxide and carbon dioxide / CaCO   CaO +
                                                                                               3
                   CO2
                   calcium oxide / calcium carbonate reacts with silica / silicon oxide / silicon(IV) oxide (in ore)
                   to form calcium silicate / slag / CaO + SiO   CaSiO  or CaCO  + SiO   CaSiO  + CO
                                                          2         3        3      2         3     2
                   the reaction between carbon and oxygen is exothermic / produces heat / coke is used as a
                   fuel / the slag floats on the (molten) iron / the slag and molten iron can be run off separately
                                                                                                       [6]
               (b) (i)  greenhouse effect / CO2 is a greenhouse gas                                    [1] 
                       global warming / ice caps melting / suitable example                            [1] 
                   (ii) burning or combustion of charcoal produces carbon dioxide                      [1] 
                       trees use carbon dioxide (in photosynthesis)                                    [1] 
                                          3+
                  (iii) cathode reaction Fe  + 3e  Fe                                                 [1] 
                                        2-
                       anode reaction 2O   O  + 4e                                                    [2] 
                                              2
                       not balanced = (1) only
                                                                                               [Total: 13] 
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           3 (a (i)  Cu(OH)   CuO + H O                                                            [1
                              2           2
                   (ii) Rb                                                                          [1] 
               (b) (i)  electron loss                                                               [1] 
                   (ii) because they can accept electrons                                           [1] 
               (c) (i)  copper and mercury                                                          [1] 
                   (ii) add copper / mercury / metal to (named) acid and no reaction / no bubbles / no
                       hydrogen                                                                     [1]
               (d) (i)  Mn                                                                          [1] 
                   (ii) (solution) becomes colourless / decolourises
                       NOT: clear                                                                   [1] 
                                                                                              [Total: 8] 
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...Www igexams com the periodic table mark scheme level igcse subject chemistry examboard cie topic sub paper extended theory booklet timeallowed minutes score percentage a i particles spread to fill total available volume move from high concentration low moves down gradient ii mass or m r b helium atoms molecules are lighter than in air n and o is less dense diffuses through porous barrier faster rate of diffusion at temperatures c ch co h would get mixture carbon dioxide gases waste methane natural gas fossil fuel iii fractional distillation any one fe for correct equation not balanced only four coke burns form this reacts with more monoxide calcium carbonate decomposes oxide caco cao silica silicon iv ore silicate slag sio casio reaction between oxygen exothermic produces heat used as floats on molten iron can be run off separately greenhouse effect global warming ice caps melting suitable example burning combustion charcoal trees use photosynthesis cathode e anode cu oh cuo electron l...

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