Identification of Ions - Core
Identification of Ions - Core
Identification of Ions - Core
calcium, Ca2+ white ppt., insoluble in excess no ppt. or very slight white ppt.
3+
chromium(III), Cr green ppt., soluble in excess green ppt., insoluble in excess
copper(II), Cu2+ light blue ppt., insoluble in excess light blue ppt., soluble in excess, giving a
dark blue solution
iron(II), Fe2+ green ppt., insoluble in excess, ppt. turns green ppt., insoluble in excess, ppt. turns
brown near surface on standing brown near surface on standing
iron(III), Fe3+ red-brown ppt., insoluble in excess red-brown ppt., insoluble in excess
2+
zinc, Zn white ppt., soluble in excess, giving a white ppt., soluble in excess, giving a
colourless solution colourless solution
H He
hydrogen helium
Key 1 4
3 4 atomic number 5 6 7 8 9 10
Li Be atomic symbol B C N O F Ne
lithium beryllium name boron carbon nitrogen oxygen fluorine neon
7 9 relative atomic mass 11 12 14 16 19 20
11 12 13 14 15 16 17 18
Na Mg Al Si P S Cl Ar
sodium magnesium aluminium silicon phosphorus sulfur chlorine argon
23 24 27 28 31 32 35.5 40
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton
39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84
The Periodic Table of Elements
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon
85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131
55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
lanthanoids
Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
caesium barium hafnium tantalum tungsten rhenium osmium iridium platinum gold mercury thallium lead bismuth polonium astatine radon
133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – –
87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
actinoids
Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium nihonium flerovium moscovium livermorium tennessine oganesson
– – – – – – – – – – – – – – – – –
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
lanthanoids La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
lanthanum cerium praseodymium neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium
139 140 141 144 – 150 152 157 159 163 165 167 169 173 175
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
actinoids Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium
– 232 231 238 – – – – – – – – – – –
The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).
www.cambridgeinternational.org/igcse
47
Cambridge IGCSE Chemistry 0620 syllabus for 2023, 2024 and 2025. Details of the assessment
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
1 Two substances, C and D, were analysed. Solid C was a salt and solution D was an aqueous
solution of chromium(III) chloride.
The tests on solid C, and some of the observations, are in the following table.
tests observations
tests on solid C
.............................................................................................................................................. [2]
.............................................................................................................................................. [1]
(i) test 1
observations .......................................................................................................................
....................................................................................................................................... [3]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
(ii) test 2
(iii) test 3
Dilute nitric acid was added to solution D followed by aqueous silver nitrate.
.............................................................................................................................................. [1]
[Total: 10]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
2 Two solids, L and M, were analysed. Solid L was copper(II) chloride and solid M was a different
salt.
The tests on the solids, and some of the observations, are shown.
tests on solid L
The solution was divided into four equal portions in four test-tubes and the following tests
carried out.
(i) Drops of aqueous ammonia were added to the first portion of the solution.
Excess ammonia solution was then added to the mixture and shaken.
observation .........................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [4]
(ii) Excess aqueous sodium hydroxide was added to the second portion of the solution.
observation .........................................................................................................................
....................................................................................................................................... [1]
(iii) Dilute nitric acid was added to the third portion of the solution followed by aqueous silver
nitrate.
(iv) Dilute nitric acid was added to the fourth portion of the solution followed by aqueous
barium nitrate.
tests on solid M
The solid was heated and the gas given off was a sublimate formed
tested with damp red litmus paper. on the sides of the test-tube
....................................................................................................................................................
.............................................................................................................................................. [2]
[Total: 10]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
tests observations
tests on solid U
.............................................................................................................................................. [1]
.............................................................................................................................................. [1]
....................................................................................................................................................
.............................................................................................................................................. [2]
[Total: 7]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
tests observations
tests on solid D
.............................................................................................................................................. [2]
(f) What conclusions can you draw about the identity of solid D?
....................................................................................................................................................
.............................................................................................................................................. [3]
[Total: 8]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
2 Two liquids, L and M, were analysed. L was aqueous potassium iodide. M was a colourless
5.
liquid.
The tests on the liquids and some of the observations are in the following table.
Complete the observations in the table.
tests observations
tests on liquid L
...........................................................................................................................................
..................................................................................................................................... [1]
(f) What conclusions can you draw about liquid M from test (b)(ii)?
...........................................................................................................................................
..................................................................................................................................... [2]
[Total: 7]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
tests observations
tests observations
..................................................................................................................................... [1]
..................................................................................................................................... [1]
...........................................................................................................................................
..................................................................................................................................... [2]
[Total: 12]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
4 Two different liquids, M and N, were analysed. N was aqueous potassium iodide.
7. The tests on the liquids and some of the observations are in the following table.
Complete the observations in the table.
tests observations
...........................................................................................................................................
..................................................................................................................................... [2]
[Total: 7]
Save My Exams! – The Home of Revision
For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
tests observations
R colourless, no smell
R pH 7
Q slow effervescence
R no reaction
..................................................................................................................................... [2]
..................................................................................................................................... [1]
[Total: 9]