Practice · ICSE / CBSE / SSLC · free
Practice sets, with the answers on the second page.
Free practice sheets for your board. Write the formula from the name, then balance the equation. The answers are at the end of each set, so you can mark your own work.
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ICSE · Classes 6 to 9
Indian Certificate of Secondary Education, set by the Council for the Indian School Certificate Examinations
0 formulas to write and 0 equations to balance, compiled from this board's own textbooks. The full chapter-by-chapter list is on its syllabus page.
Answers — ICSE
Mark the set against these after it is finished, not during. If you are printing the sheet and want the answers on it, leave this block open before you print — it starts a new page.
CBSE · Classes 7 to 10
Central Board of Secondary Education
79 formulas to write and 67 equations to balance, compiled from this board's own textbooks. The full chapter-by-chapter list is on its syllabus page.
Write the formula
| No. | Name | Formula |
|---|---|---|
| 1 | Acetic Acid | |
| 2 | Aluminium Chloride | |
| 3 | Aluminium Oxide | |
| 4 | Aluminium Sulphate | |
| 5 | Ammonium Chloride | |
| 6 | Ammonium Sulphate | |
| 7 | Barium Bromide | |
| 8 | Barium Chloride | |
| 9 | Barium Iodide | |
| 10 | Barium Sulphate | |
| 11 | Bleaching Powder | |
| 12 | Calcium Bicarbonate | |
| 13 | Calcium Carbonate | |
| 14 | Calcium Chloride | |
| 15 | Calcium Hydroxide | |
| 16 | Calcium Nitrate | |
| 17 | Calcium Oxide | |
| 18 | Carbon Chloride | |
| 19 | Carbon Dioxide | |
| 20 | Carbon Monoxide | |
| 21 | Copper [Cupric] Carbonate | |
| 22 | Copper [Cupric] Chloride | |
| 23 | Copper [Cupric] Hydroxide | |
| 24 | Copper [Cupric] Oxide | |
| 25 | Copper One Oxide | |
| 26 | Copper One Sulphide | |
| 27 | Copper Two Nitrate | |
| 28 | Copper Two Sulphate | |
| 29 | Hydrochloric Acid | |
| 30 | Hydrogen Nitrate | |
| 31 | Hydrogen Sulphate | |
| 32 | Hydrogen Sulphide | |
| 33 | Hydrogen Sulphite | |
| 34 | Iron Three Oxide | |
| 35 | Iron Two Chloride | |
| 36 | Iron Two Sulphate | |
| 37 | Iron Two Three Oxide | |
| 38 | Lead [Plumbous] Chloride | |
| 39 | Lead [Plumbous] Nitrate | |
| 40 | Lead [Plumbous] Oxide | |
| 41 | Magnesium Chloride | |
| 42 | Magnesium Hydroxide | |
| 43 | Magnesium Oxide | |
| 44 | Manganese Four Oxide | |
| 45 | Manganese Two Chloride | |
| 46 | Mercury [Mercuric] Oxide | |
| 47 | Mercury [Mercuric] Sulphide | |
| 48 | Methanol | |
| 49 | Nitrogen Dioxide | |
| 50 | Nitrogen Hydride | |
| 51 | Potassium Bromide | |
| 52 | Potassium Carbonate | |
| 53 | Potassium Hydroxide | |
| 54 | Potassium Iodide | |
| 55 | Potassium Nitrate | |
| 56 | Potassium Oxide | |
| 57 | Potassium Sulphate | |
| 58 | Silver Bromide | |
| 59 | Silver Chloride | |
| 60 | Silver Nitrate | |
| 61 | Sodium Aluminate | |
| 62 | Sodium Bicarbonate | |
| 63 | Sodium Carbonate | |
| 64 | Sodium Chloride | |
| 65 | Sodium Hydroxide | |
| 66 | Sodium Nitrate | |
| 67 | Sodium Oxide | |
| 68 | Sodium Phosphate | |
| 69 | Sodium Sulphate | |
| 70 | Sodium Sulphide | |
| 71 | Sodium Sulphite | |
| 72 | Sodium Zincate | |
| 73 | Sulphur Dioxide | |
| 74 | Sulphur Trioxide | |
| 75 | Zinc Carbonate | |
| 76 | Zinc Nitrate | |
| 77 | Zinc Oxide | |
| 78 | Zinc Sulphate | |
| 79 | Zinc Sulphide |
Balance the equation
| No. | Equation | Condition |
|---|---|---|
| 1 | HClplus NaOH→ NaClplus H2O | — |
| 2 | MgOplus H2O→ Mg(OH)2 | — |
| 3 | CO2plus Ca(OH)2→ CaCO3plus H2O | — |
| 4 | Cuplus H2Oplus CO2plus O2→ Cu(OH)2plus CuCO3 | — |
| 5 | SO2plus H2O→ H2SO3 | — |
| 6 | CuSO4plus Zn→ ZnSO4plus Cu | — |
| 7 | Znplus H2SO4→ ZnSO4plus H2 | — |
| 8 | Feplus H2O→ Fe3O4plus H2 | steam |
| 9 | COplus H2→ CH3OH | — |
| 10 | H2plus Cl2→ HCl | — |
| 11 | BaCl2plus Al2(SO4)3→ BaSO4plus AlCl3 | — |
| 12 | Naplus H2O→ NaOHplus H2 | — |
| 13 | BaCl2plus Na2SO4→ BaSO4plus NaCl | — |
| 14 | CaOplus H2O→ Ca(OH)2 | — |
| 15 | Cplus O2→ CO2 | — |
| 16 | H2plus O2→ H2O | — |
| 17 | CH4plus O2→ CO2plus H2O | — |
| 18 | FeSO4→ Fe2O3plus SO2plus SO3 | heat |
| 19 | CaCO3→ CaOplus CO2 | heat |
| 20 | Pb(NO3)2→ PbOplus NO2plus O2 | heat |
| 21 | AgCl→ Agplus Cl2 | sunlight |
| 22 | AgBr→ Agplus Br2 | sunlight |
| 23 | Feplus CuSO4→ FeSO4plus Cu | — |
| 24 | Pbplus CuCl2→ PbCl2plus Cu | — |
| 25 | Cuplus O2→ CuO | — |
| 26 | CuOplus H2→ Cuplus H2O | — |
| 27 | ZnOplus C→ Znplus CO | — |
| 28 | MnO2plus HCl→ MnCl2plus H2Oplus Cl2 | — |
| 29 | Naplus O2→ Na2O | — |
| 30 | PbOplus C→ Pbplus CO2 | — |
| 31 | Fe2O3plus Al→ Al2O3plus Fe | — |
| 32 | NaOHplus H2SO4→ Na2SO4plus H2O | — |
| 33 | H2plus N2→ NH3 | — |
| 34 | H2Splus O2→ H2Oplus SO2 | — |
| 35 | Kplus H2O→ KOHplus H2 | — |
| 36 | HNO3plus Ca(OH)2→ Ca(NO3)2plus H2O | — |
| 37 | NaClplus AgNO3→ AgClplus NaNO3 | — |
| 38 | BaCl2plus H2SO4→ BaSO4plus HCl | — |
| 39 | Znplus AgNO3→ Zn(NO3)2plus Ag | — |
| 40 | Alplus CuCl2→ AlCl3plus Cu | — |
| 41 | BaCl2plus K2SO4→ BaSO4plus KCl | — |
| 42 | KBrplus BaI2→ KIplus BaBr2 | — |
| 43 | ZnCO3→ ZnOplus CO2 | — |
| 44 | Mgplus HCl→ MgCl2plus H2 | — |
| 45 | NaOHplus Zn→ Na2ZnO2plus H2 | — |
| 46 | Na2CO3plus HCl→ NaClplus H2Oplus CO2 | — |
| 47 | NaHCO3plus HCl→ NaClplus H2Oplus CO2 | — |
| 48 | CaCO3plus H2Oplus CO2→ Ca(HCO3)2 | — |
| 49 | NaClplus H2O→ NaOHplus Cl2plus H2 | electrolysis |
| 50 | Ca(OH)2plus Cl2→ CaOCl2plus H2O | — |
| 51 | NaClplus H2Oplus CO2plus NH3→ NH4Clplus NaHCO3 | — |
| 52 | NaHCO3→ Na2CO3plus H2Oplus CO2 | heat |
| 53 | Alplus H2SO4→ Al2(SO4)3plus H2 | — |
| 54 | Feplus HCl→ FeCl2plus H2 | dilute acid |
| 55 | Alplus O2→ Al2O3 | — |
| 56 | Al2O3plus HCl→ AlCl3plus H2O | — |
| 57 | Al2O3plus NaOH→ NaAlO2plus H2O | — |
| 58 | Na2Oplus H2O→ NaOH | — |
| 59 | K2Oplus H2O→ KOH | — |
| 60 | Caplus H2O→ Ca(OH)2plus H2 | — |
| 61 | Alplus H2O→ Al2O3plus H2 | — |
| 62 | HgSplus O2→ HgOplus SO2 | — |
| 63 | HgO→ Hgplus O2 | heat |
| 64 | Cu2Oplus Cu2S→ Cuplus SO2 | — |
| 65 | ZnSplus O2→ ZnOplus SO2 | — |
| 66 | MnO2plus Al→ Mnplus Al2O3 | — |
| 67 | Splus O2→ SO2 | — |
Answers — CBSE
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| No. | Name | Formula | Built from |
|---|---|---|---|
| 1 | Acetic Acid | CH3COOH | Not built by the criss-cross rule |
| 2 | Aluminium Chloride | AlCl3 | Aluminium 3 · Chloride 1 |
| 3 | Aluminium Oxide | Al2O3 | Aluminium 3 · Oxide 2 |
| 4 | Aluminium Sulphate | Al2(SO4)3 | Aluminium 3 · Sulphate 2 |
| 5 | Ammonium Chloride | NH4Cl | Ammonium 1 · Chloride 1 |
| 6 | Ammonium Sulphate | (NH4)2SO4 | Ammonium 1 · Sulphate 2 |
| 7 | Barium Bromide | BaBr2 | Barium 2 · Bromide 1 |
| 8 | Barium Chloride | BaCl2 | Barium 2 · Chloride 1 |
| 9 | Barium Iodide | BaI2 | Barium 2 · Iodide 1 |
| 10 | Barium Sulphate | BaSO4 | Barium 2 · Sulphate 2 |
| 11 | Bleaching Powder | CaOCl2 | Not built by the criss-cross rule |
| 12 | Calcium Bicarbonate | Ca(HCO3)2 | Calcium 2 · Bicarbonate 1 |
| 13 | Calcium Carbonate | CaCO3 | Calcium 2 · Carbonate 2 |
| 14 | Calcium Chloride | CaCl2 | Calcium 2 · Chloride 1 |
| 15 | Calcium Hydroxide | Ca(OH)2 | Calcium 2 · Hydroxide 1 |
| 16 | Calcium Nitrate | Ca(NO3)2 | Calcium 2 · Nitrate 1 |
| 17 | Calcium Oxide | CaO | Calcium 2 · Oxide 2 |
| 18 | Carbon Chloride | CCl4 | Carbon 4 · Chloride 1 |
| 19 | Carbon Dioxide | CO2 | Carbon 4 · Oxide 2 |
| 20 | Carbon Monoxide | CO | Not built by the criss-cross rule |
| 21 | Copper [Cupric] Carbonate | CuCO3 | Copper [Cupric] 2 · Carbonate 2 |
| 22 | Copper [Cupric] Chloride | CuCl2 | Copper [Cupric] 2 · Chloride 1 |
| 23 | Copper [Cupric] Hydroxide | Cu(OH)2 | Copper [Cupric] 2 · Hydroxide 1 |
| 24 | Copper [Cupric] Oxide | CuO | Copper [Cupric] 2 · Oxide 2 |
| 25 | Copper One Oxide | Cu2O | Copper [Cuprous] 1 · Oxide 2 |
| 26 | Copper One Sulphide | Cu2S | Copper [Cuprous] 1 · Sulphide 2 |
| 27 | Copper Two Nitrate | Cu(NO3)2 | Copper [Cupric] 2 · Nitrate 1 |
| 28 | Copper Two Sulphate | CuSO4 | Copper [Cupric] 2 · Sulphate 2 |
| 29 | Hydrochloric Acid | HCl | Hydrogen 1 · Chloride 1 |
| 30 | Hydrogen Nitrate | HNO3 | Hydrogen 1 · Nitrate 1 |
| 31 | Hydrogen Sulphate | H2SO4 | Hydrogen 1 · Sulphate 2 |
| 32 | Hydrogen Sulphide | H2S | Hydrogen 1 · Sulphide 2 |
| 33 | Hydrogen Sulphite | H2SO3 | Hydrogen 1 · Sulphite 2 |
| 34 | Iron Three Oxide | Fe2O3 | Iron [Ferric] 3 · Oxide 2 |
| 35 | Iron Two Chloride | FeCl2 | Iron [Ferrous] 2 · Chloride 1 |
| 36 | Iron Two Sulphate | FeSO4 | Iron [Ferrous] 2 · Sulphate 2 |
| 37 | Iron Two Three Oxide | Fe3O4 | Not built by the criss-cross rule |
| 38 | Lead [Plumbous] Chloride | PbCl2 | Lead [Plumbous] 2 · Chloride 1 |
| 39 | Lead [Plumbous] Nitrate | Pb(NO3)2 | Lead [Plumbous] 2 · Nitrate 1 |
| 40 | Lead [Plumbous] Oxide | PbO | Lead [Plumbous] 2 · Oxide 2 |
| 41 | Magnesium Chloride | MgCl2 | Magnesium 2 · Chloride 1 |
| 42 | Magnesium Hydroxide | Mg(OH)2 | Magnesium 2 · Hydroxide 1 |
| 43 | Magnesium Oxide | MgO | Magnesium 2 · Oxide 2 |
| 44 | Manganese Four Oxide | MnO2 | Manganese 4 · Oxide 2 |
| 45 | Manganese Two Chloride | MnCl2 | Manganese 2 · Chloride 1 |
| 46 | Mercury [Mercuric] Oxide | HgO | Mercury [Mercuric] 2 · Oxide 2 |
| 47 | Mercury [Mercuric] Sulphide | HgS | Mercury [Mercuric] 2 · Sulphide 2 |
| 48 | Methanol | CH3OH | Not built by the criss-cross rule |
| 49 | Nitrogen Dioxide | NO2 | Not built by the criss-cross rule |
| 50 | Nitrogen Hydride | NH3 | Nitrogen 3 · Hydride 1 |
| 51 | Potassium Bromide | KBr | Potassium 1 · Bromide 1 |
| 52 | Potassium Carbonate | K2CO3 | Potassium 1 · Carbonate 2 |
| 53 | Potassium Hydroxide | KOH | Potassium 1 · Hydroxide 1 |
| 54 | Potassium Iodide | KI | Potassium 1 · Iodide 1 |
| 55 | Potassium Nitrate | KNO3 | Potassium 1 · Nitrate 1 |
| 56 | Potassium Oxide | K2O | Potassium 1 · Oxide 2 |
| 57 | Potassium Sulphate | K2SO4 | Potassium 1 · Sulphate 2 |
| 58 | Silver Bromide | AgBr | Silver 1 · Bromide 1 |
| 59 | Silver Chloride | AgCl | Silver 1 · Chloride 1 |
| 60 | Silver Nitrate | AgNO3 | Silver 1 · Nitrate 1 |
| 61 | Sodium Aluminate | NaAlO2 | Sodium 1 · Aluminate 1 |
| 62 | Sodium Bicarbonate | NaHCO3 | Sodium 1 · Bicarbonate 1 |
| 63 | Sodium Carbonate | Na2CO3 | Sodium 1 · Carbonate 2 |
| 64 | Sodium Chloride | NaCl | Sodium 1 · Chloride 1 |
| 65 | Sodium Hydroxide | NaOH | Sodium 1 · Hydroxide 1 |
| 66 | Sodium Nitrate | NaNO3 | Sodium 1 · Nitrate 1 |
| 67 | Sodium Oxide | Na2O | Sodium 1 · Oxide 2 |
| 68 | Sodium Phosphate | Na3PO4 | Sodium 1 · Phosphate 3 |
| 69 | Sodium Sulphate | Na2SO4 | Sodium 1 · Sulphate 2 |
| 70 | Sodium Sulphide | Na2S | Sodium 1 · Sulphide 2 |
| 71 | Sodium Sulphite | Na2SO3 | Sodium 1 · Sulphite 2 |
| 72 | Sodium Zincate | Na2ZnO2 | Sodium 1 · Zincate 2 |
| 73 | Sulphur Dioxide | SO2 | Not built by the criss-cross rule |
| 74 | Sulphur Trioxide | SO3 | Not built by the criss-cross rule |
| 75 | Zinc Carbonate | ZnCO3 | Zinc 2 · Carbonate 2 |
| 76 | Zinc Nitrate | Zn(NO3)2 | Zinc 2 · Nitrate 1 |
| 77 | Zinc Oxide | ZnO | Zinc 2 · Oxide 2 |
| 78 | Zinc Sulphate | ZnSO4 | Zinc 2 · Sulphate 2 |
| 79 | Zinc Sulphide | ZnS | Zinc 2 · Sulphide 2 |
| No. | Balanced |
|---|---|
| 1 | HClplus NaOH→ NaClplus H2O |
| 2 | MgOplus H2O→ Mg(OH)2 |
| 3 | CO2plus Ca(OH)2→ CaCO3plus H2O |
| 4 | 2Cuplus H2Oplus CO2plus O2→ Cu(OH)2plus CuCO3 |
| 5 | SO2plus H2O→ H2SO3 |
| 6 | CuSO4plus Zn→ ZnSO4plus Cu |
| 7 | Znplus H2SO4→ ZnSO4plus H2 |
| 8 | 3Feplus 4H2O→ Fe3O4plus 4H2 |
| 9 | COplus 2H2→ CH3OH |
| 10 | H2plus Cl2→ 2HCl |
| 11 | 3BaCl2plus Al2(SO4)3→ 3BaSO4plus 2AlCl3 |
| 12 | 2Naplus 2H2O→ 2NaOHplus H2 |
| 13 | BaCl2plus Na2SO4→ BaSO4plus 2NaCl |
| 14 | CaOplus H2O→ Ca(OH)2 |
| 15 | Cplus O2→ CO2 |
| 16 | 2H2plus O2→ 2H2O |
| 17 | CH4plus 2O2→ CO2plus 2H2O |
| 18 | 2FeSO4→ Fe2O3plus SO2plus SO3 |
| 19 | CaCO3→ CaOplus CO2 |
| 20 | 2Pb(NO3)2→ 2PbOplus 4NO2plus O2 |
| 21 | 2AgCl→ 2Agplus Cl2 |
| 22 | 2AgBr→ 2Agplus Br2 |
| 23 | Feplus CuSO4→ FeSO4plus Cu |
| 24 | Pbplus CuCl2→ PbCl2plus Cu |
| 25 | 2Cuplus O2→ 2CuO |
| 26 | CuOplus H2→ Cuplus H2O |
| 27 | ZnOplus C→ Znplus CO |
| 28 | MnO2plus 4HCl→ MnCl2plus 2H2Oplus Cl2 |
| 29 | 4Naplus O2→ 2Na2O |
| 30 | 2PbOplus C→ 2Pbplus CO2 |
| 31 | Fe2O3plus 2Al→ Al2O3plus 2Fe |
| 32 | 2NaOHplus H2SO4→ Na2SO4plus 2H2O |
| 33 | 3H2plus N2→ 2NH3 |
| 34 | 2H2Splus 3O2→ 2H2Oplus 2SO2 |
| 35 | 2Kplus 2H2O→ 2KOHplus H2 |
| 36 | 2HNO3plus Ca(OH)2→ Ca(NO3)2plus 2H2O |
| 37 | NaClplus AgNO3→ AgClplus NaNO3 |
| 38 | BaCl2plus H2SO4→ BaSO4plus 2HCl |
| 39 | Znplus 2AgNO3→ Zn(NO3)2plus 2Ag |
| 40 | 2Alplus 3CuCl2→ 2AlCl3plus 3Cu |
| 41 | BaCl2plus K2SO4→ BaSO4plus 2KCl |
| 42 | 2KBrplus BaI2→ 2KIplus BaBr2 |
| 43 | ZnCO3→ ZnOplus CO2 |
| 44 | Mgplus 2HCl→ MgCl2plus H2 |
| 45 | 2NaOHplus Zn→ Na2ZnO2plus H2 |
| 46 | Na2CO3plus 2HCl→ 2NaClplus H2Oplus CO2 |
| 47 | NaHCO3plus HCl→ NaClplus H2Oplus CO2 |
| 48 | CaCO3plus H2Oplus CO2→ Ca(HCO3)2 |
| 49 | 2NaClplus 2H2O→ 2NaOHplus Cl2plus H2 |
| 50 | Ca(OH)2plus Cl2→ CaOCl2plus H2O |
| 51 | NaClplus H2Oplus CO2plus NH3→ NH4Clplus NaHCO3 |
| 52 | 2NaHCO3→ Na2CO3plus H2Oplus CO2 |
| 53 | 2Alplus 3H2SO4→ Al2(SO4)3plus 3H2 |
| 54 | Feplus 2HCl→ FeCl2plus H2 |
| 55 | 4Alplus 3O2→ 2Al2O3 |
| 56 | Al2O3plus 6HCl→ 2AlCl3plus 3H2O |
| 57 | Al2O3plus 2NaOH→ 2NaAlO2plus H2O |
| 58 | Na2Oplus H2O→ 2NaOH |
| 59 | K2Oplus H2O→ 2KOH |
| 60 | Caplus 2H2O→ Ca(OH)2plus H2 |
| 61 | 2Alplus 3H2O→ Al2O3plus 3H2 |
| 62 | 2HgSplus 3O2→ 2HgOplus 2SO2 |
| 63 | 2HgO→ 2Hgplus O2 |
| 64 | 2Cu2Oplus Cu2S→ 6Cuplus SO2 |
| 65 | 2ZnSplus 3O2→ 2ZnOplus 2SO2 |
| 66 | 3MnO2plus 4Al→ 3Mnplus 2Al2O3 |
| 67 | Splus O2→ SO2 |
SSLC · Classes 8 to 10
Secondary School Leaving Certificate, Kerala State syllabus
52 formulas to write and 51 equations to balance, compiled from this board's own textbooks. The full chapter-by-chapter list is on its syllabus page.
Write the formula
| No. | Name | Formula |
|---|---|---|
| 1 | Aluminium Chloride | |
| 2 | Aluminium Hydroxide | |
| 3 | Aluminium Oxide | |
| 4 | Aluminium Sulphate | |
| 5 | Ammonium Chloride | |
| 6 | Ammonium Hydroxide | |
| 7 | Barium Chloride | |
| 8 | Barium Sulphate | |
| 9 | Calcium Carbonate | |
| 10 | Calcium Chloride | |
| 11 | Calcium Hydroxide | |
| 12 | Calcium Oxide | |
| 13 | Calcium Sulphate | |
| 14 | Carbon Dioxide | |
| 15 | Carbon Monoxide | |
| 16 | Copper Two Nitrate | |
| 17 | Copper Two Sulphate | |
| 18 | Hydrochloric Acid | |
| 19 | Hydrogen Carbonate | |
| 20 | Hydrogen Nitrate | |
| 21 | Hydrogen Phosphate | |
| 22 | Hydrogen Sulphate | |
| 23 | Hydrogen Sulphite | |
| 24 | Iron Two Chloride | |
| 25 | Iron Two Sulphate | |
| 26 | Magnesium Chloride | |
| 27 | Magnesium Fluoride | |
| 28 | Magnesium Hydroxide | |
| 29 | Magnesium Nitrate | |
| 30 | Magnesium Oxide | |
| 31 | Magnesium Sulphate | |
| 32 | Manganese Two Chloride | |
| 33 | Nitrogen Dioxide | |
| 34 | Nitrogen Hydride | |
| 35 | Potassium Chlorate | |
| 36 | Potassium Chloride | |
| 37 | Potassium Hydroxide | |
| 38 | Potassium Oxide | |
| 39 | Potassium Permanganate | |
| 40 | Potassium Phosphate | |
| 41 | Silver Chloride | |
| 42 | Silver Nitrate | |
| 43 | Sodium Bromide | |
| 44 | Sodium Chloride | |
| 45 | Sodium Hydride | |
| 46 | Sodium Hydroxide | |
| 47 | Sodium Nitrate | |
| 48 | Sulphur Dioxide | |
| 49 | Sulphur Trioxide | |
| 50 | Zinc Chloride | |
| 51 | Zinc Oxide | |
| 52 | Zinc Sulphate |
Balance the equation
| No. | Equation | Condition |
|---|---|---|
| 1 | Znplus HCl→ ZnCl2plus H2 | — |
| 2 | Cplus O2→ CO2 | — |
| 3 | H2plus Cl2→ HCl | — |
| 4 | H2plus O2→ H2O | — |
| 5 | Mgplus O2→ MgO | — |
| 6 | N2plus H2→ NH3 | — |
| 7 | H2O2→ H2Oplus O2 | — |
| 8 | CH4plus O2→ CO2plus H2O | — |
| 9 | N2plus O2→ NO | — |
| 10 | CaCO3→ CaOplus CO2 | heat |
| 11 | H2plus I2→ HI | — |
| 12 | Feplus HCl→ FeCl2plus H2 | — |
| 13 | CO2plus C→ CO | — |
| 14 | Mgplus HCl→ MgCl2plus H2 | — |
| 15 | Naplus H2O→ NaOHplus H2 | — |
| 16 | Alplus HCl→ AlCl3plus H2 | — |
| 17 | Alplus O2→ Al2O3 | — |
| 18 | SO2plus O2→ SO3 | — |
| 19 | BaCl2plus H2SO4→ BaSO4plus HCl | — |
| 20 | Mgplus Cl2→ MgCl2 | — |
| 21 | Mgplus F2→ MgF2 | — |
| 22 | Naplus Cl2→ NaCl | — |
| 23 | CaCO3plus HCl→ CaCl2plus H2Oplus CO2 | — |
| 24 | MgOplus H2O→ Mg(OH)2 | — |
| 25 | CaOplus H2O→ Ca(OH)2 | — |
| 26 | NaOHplus HCl→ NaClplus H2O | — |
| 27 | Mg(OH)2plus H2SO4→ MgSO4plus H2O | — |
| 28 | Znplus H2SO4→ ZnSO4plus H2 | — |
| 29 | Mgplus HNO3→ Mg(NO3)2plus H2 | — |
| 30 | Znplus CuSO4→ ZnSO4plus Cu | — |
| 31 | NaBrplus Cl2→ NaClplus Br2 | — |
| 32 | Splus O2→ SO2 | — |
| 33 | H2plus S→ H2S | — |
| 34 | Naplus H2→ NaH | — |
| 35 | NaCl→ Naplus Cl2 | electrolysis |
| 36 | KClO3→ KClplus O2 | heat |
| 37 | NOplus O2→ NO2 | — |
| 38 | KMnO4plus HCl→ KClplus MnCl2plus H2Oplus Cl2 | — |
| 39 | Cl2plus H2O→ HClplus HOCl | — |
| 40 | NaClplus AgNO3→ AgClplus NaNO3 | — |
| 41 | Na2SO4plus BaCl2→ BaSO4plus NaCl | — |
| 42 | KClplus AgNO3→ AgClplus KNO3 | — |
| 43 | ZnSO4plus BaCl2→ BaSO4plus ZnCl2 | — |
| 44 | H2O→ H2plus O2 | electrolysis |
| 45 | FeSO4plus Zn→ ZnSO4plus Fe | — |
| 46 | AgNO3plus Cu→ Cu(NO3)2plus Ag | — |
| 47 | NH4Clplus Ca(OH)2→ CaCl2plus H2Oplus NH3 | — |
| 48 | NH3plus H2O→ NH4OH | — |
| 49 | NH3plus HCl→ NH4Cl | — |
| 50 | Cplus H2SO4→ CO2plus H2Oplus SO2 | — |
| 51 | Cuplus H2SO4→ CuSO4plus SO2plus H2O | — |
Answers — SSLC
Mark the set against these after it is finished, not during. If you are printing the sheet and want the answers on it, leave this block open before you print — it starts a new page.
| No. | Name | Formula | Built from |
|---|---|---|---|
| 1 | Aluminium Chloride | AlCl3 | Aluminium 3 · Chloride 1 |
| 2 | Aluminium Hydroxide | Al(OH)3 | Aluminium 3 · Hydroxide 1 |
| 3 | Aluminium Oxide | Al2O3 | Aluminium 3 · Oxide 2 |
| 4 | Aluminium Sulphate | Al2(SO4)3 | Aluminium 3 · Sulphate 2 |
| 5 | Ammonium Chloride | NH4Cl | Ammonium 1 · Chloride 1 |
| 6 | Ammonium Hydroxide | NH4OH | Ammonium 1 · Hydroxide 1 |
| 7 | Barium Chloride | BaCl2 | Barium 2 · Chloride 1 |
| 8 | Barium Sulphate | BaSO4 | Barium 2 · Sulphate 2 |
| 9 | Calcium Carbonate | CaCO3 | Calcium 2 · Carbonate 2 |
| 10 | Calcium Chloride | CaCl2 | Calcium 2 · Chloride 1 |
| 11 | Calcium Hydroxide | Ca(OH)2 | Calcium 2 · Hydroxide 1 |
| 12 | Calcium Oxide | CaO | Calcium 2 · Oxide 2 |
| 13 | Calcium Sulphate | CaSO4 | Calcium 2 · Sulphate 2 |
| 14 | Carbon Dioxide | CO2 | Carbon 4 · Oxide 2 |
| 15 | Carbon Monoxide | CO | Not built by the criss-cross rule |
| 16 | Copper Two Nitrate | Cu(NO3)2 | Copper [Cupric] 2 · Nitrate 1 |
| 17 | Copper Two Sulphate | CuSO4 | Copper [Cupric] 2 · Sulphate 2 |
| 18 | Hydrochloric Acid | HCl | Hydrogen 1 · Chloride 1 |
| 19 | Hydrogen Carbonate | H2CO3 | Hydrogen 1 · Carbonate 2 |
| 20 | Hydrogen Nitrate | HNO3 | Hydrogen 1 · Nitrate 1 |
| 21 | Hydrogen Phosphate | H3PO4 | Hydrogen 1 · Phosphate 3 |
| 22 | Hydrogen Sulphate | H2SO4 | Hydrogen 1 · Sulphate 2 |
| 23 | Hydrogen Sulphite | H2SO3 | Hydrogen 1 · Sulphite 2 |
| 24 | Iron Two Chloride | FeCl2 | Iron [Ferrous] 2 · Chloride 1 |
| 25 | Iron Two Sulphate | FeSO4 | Iron [Ferrous] 2 · Sulphate 2 |
| 26 | Magnesium Chloride | MgCl2 | Magnesium 2 · Chloride 1 |
| 27 | Magnesium Fluoride | MgF2 | Magnesium 2 · Fluoride 1 |
| 28 | Magnesium Hydroxide | Mg(OH)2 | Magnesium 2 · Hydroxide 1 |
| 29 | Magnesium Nitrate | Mg(NO3)2 | Magnesium 2 · Nitrate 1 |
| 30 | Magnesium Oxide | MgO | Magnesium 2 · Oxide 2 |
| 31 | Magnesium Sulphate | MgSO4 | Magnesium 2 · Sulphate 2 |
| 32 | Manganese Two Chloride | MnCl2 | Manganese 2 · Chloride 1 |
| 33 | Nitrogen Dioxide | NO2 | Not built by the criss-cross rule |
| 34 | Nitrogen Hydride | NH3 | Nitrogen 3 · Hydride 1 |
| 35 | Potassium Chlorate | KClO3 | Potassium 1 · Chlorate 1 |
| 36 | Potassium Chloride | KCl | Potassium 1 · Chloride 1 |
| 37 | Potassium Hydroxide | KOH | Potassium 1 · Hydroxide 1 |
| 38 | Potassium Oxide | K2O | Potassium 1 · Oxide 2 |
| 39 | Potassium Permanganate | KMnO4 | Potassium 1 · Permanganate 1 |
| 40 | Potassium Phosphate | K3PO4 | Potassium 1 · Phosphate 3 |
| 41 | Silver Chloride | AgCl | Silver 1 · Chloride 1 |
| 42 | Silver Nitrate | AgNO3 | Silver 1 · Nitrate 1 |
| 43 | Sodium Bromide | NaBr | Sodium 1 · Bromide 1 |
| 44 | Sodium Chloride | NaCl | Sodium 1 · Chloride 1 |
| 45 | Sodium Hydride | NaH | Sodium 1 · Hydride 1 |
| 46 | Sodium Hydroxide | NaOH | Sodium 1 · Hydroxide 1 |
| 47 | Sodium Nitrate | NaNO3 | Sodium 1 · Nitrate 1 |
| 48 | Sulphur Dioxide | SO2 | Not built by the criss-cross rule |
| 49 | Sulphur Trioxide | SO3 | Not built by the criss-cross rule |
| 50 | Zinc Chloride | ZnCl2 | Zinc 2 · Chloride 1 |
| 51 | Zinc Oxide | ZnO | Zinc 2 · Oxide 2 |
| 52 | Zinc Sulphate | ZnSO4 | Zinc 2 · Sulphate 2 |
| No. | Balanced |
|---|---|
| 1 | Znplus 2HCl→ ZnCl2plus H2 |
| 2 | Cplus O2→ CO2 |
| 3 | H2plus Cl2→ 2HCl |
| 4 | 2H2plus O2→ 2H2O |
| 5 | 2Mgplus O2→ 2MgO |
| 6 | N2plus 3H2→ 2NH3 |
| 7 | 2H2O2→ 2H2Oplus O2 |
| 8 | CH4plus 2O2→ CO2plus 2H2O |
| 9 | N2plus O2→ 2NO |
| 10 | CaCO3→ CaOplus CO2 |
| 11 | H2plus I2→ 2HI |
| 12 | Feplus 2HCl→ FeCl2plus H2 |
| 13 | CO2plus C→ 2CO |
| 14 | Mgplus 2HCl→ MgCl2plus H2 |
| 15 | 2Naplus 2H2O→ 2NaOHplus H2 |
| 16 | 2Alplus 6HCl→ 2AlCl3plus 3H2 |
| 17 | 4Alplus 3O2→ 2Al2O3 |
| 18 | 2SO2plus O2→ 2SO3 |
| 19 | BaCl2plus H2SO4→ BaSO4plus 2HCl |
| 20 | 2Mgplus 2Cl2→ 2MgCl2 |
| 21 | 2Mgplus 2F2→ 2MgF2 |
| 22 | 2Naplus Cl2→ 2NaCl |
| 23 | CaCO3plus 2HCl→ CaCl2plus H2Oplus CO2 |
| 24 | MgOplus H2O→ Mg(OH)2 |
| 25 | CaOplus H2O→ Ca(OH)2 |
| 26 | NaOHplus HCl→ NaClplus H2O |
| 27 | Mg(OH)2plus H2SO4→ MgSO4plus 2H2O |
| 28 | Znplus H2SO4→ ZnSO4plus H2 |
| 29 | Mgplus 2HNO3→ Mg(NO3)2plus H2 |
| 30 | Znplus CuSO4→ ZnSO4plus Cu |
| 31 | 2NaBrplus Cl2→ 2NaClplus Br2 |
| 32 | Splus O2→ SO2 |
| 33 | H2plus S→ H2S |
| 34 | 2Naplus H2→ 2NaH |
| 35 | 2NaCl→ 2Naplus Cl2 |
| 36 | 2KClO3→ 2KClplus 3O2 |
| 37 | 2NOplus O2→ 2NO2 |
| 38 | 2KMnO4plus 16HCl→ 2KClplus 2MnCl2plus 8H2Oplus 5Cl2 |
| 39 | Cl2plus H2O→ HClplus HOCl |
| 40 | NaClplus AgNO3→ AgClplus NaNO3 |
| 41 | Na2SO4plus BaCl2→ BaSO4plus 2NaCl |
| 42 | KClplus AgNO3→ AgClplus KNO3 |
| 43 | ZnSO4plus BaCl2→ BaSO4plus ZnCl2 |
| 44 | 2H2O→ 2H2plus O2 |
| 45 | FeSO4plus Zn→ ZnSO4plus Fe |
| 46 | 2AgNO3plus Cu→ Cu(NO3)2plus 2Ag |
| 47 | 2NH4Clplus Ca(OH)2→ CaCl2plus 2H2Oplus 2NH3 |
| 48 | NH3plus H2O→ NH4OH |
| 49 | NH3plus HCl→ NH4Cl |
| 50 | Cplus 2H2SO4→ CO2plus 2H2Oplus 2SO2 |
| 51 | Cuplus 2H2SO4→ CuSO4plus SO2plus 2H2O |
Where these come from, and what they are not.
Every question above is generated from the inventories on the syllabus pages — the formulas and equations each board's own textbooks set, compiled chapter by chapter by the author of the Playbook. The formulas are checked against the criss-cross rule and the equations are atom-counted, on every build of this site.
None of it is taken from the book. The Language of Chemistry, Playbook® contains 19 exercises and 279 questions of its own, and those stay in the book. That is the reason this page can be given away without a form attached to it — and the reason it is not a substitute for the book, which is gated, marked and sequenced in a way a printed sheet cannot be. Printing and copying are covered on the copyright page.
Two CBSE Class 7 equations are missing from the set above on purpose: the textbook prints them unbalanced, so there is no answer to mark against. Both are shown, counted, and explained on the balancing page.
Questions
- Do I have to give an email address to get these?
- No. There is no form on this page, nothing to sign up for and nothing to download. The questions and the answers are both on the page, and the page prints.
- Where do these questions come from?
- From each board’s own syllabus: every formula and every equation the ICSE, CBSE and Kerala SSLC textbooks set, compiled chapter by chapter. None of them is taken from The Language of Chemistry, Playbook® — the book’s own exercises stay in the book.
- Can I print these for my class?
- Yes. This page is set up to print, and its questions are drawn from published syllabuses rather than from the Playbook. Photocopying the Playbook itself is a different matter and is covered on the copyright page.
- Why are the answers hidden?
- Because an answer a student can see while attempting the question is not a question. Open the answers after the set is finished, and mark it then.
A sheet is practice. The book is a sequence.
Anyone can hand a student a worksheet. What this page cannot do is stop them going on to equations while the valencies are still being guessed at — and that is the whole of the Playbook's argument: the chapter does not open until the score is made, and below the score the exercises are repeated.