
CBSE Syllabus
Students have to learn approximately ’75 Chemical Formulae’ and ‘70 Balanced Chemical Equations’ from 7th to 10th Std in Chemistry.
A detailed summary is given below for your reference for each grade/standard.
7th Standard.
Chapter – V. Acids, Bases and Salts.
Nos | Chemical Formula | Nos | Chemical Equations |
---|---|---|---|
1 | HCl | 1 | HCl + NaOH → NaCl + H2O |
2 | NaOH | ||
3 | NaCl |
Chapter – Vl. Physical and Chemical changes.
Nos | Chemical Formula | Nos | Chemical Equations |
---|---|---|---|
4 | MgO | 2 | Mg+ O2 → MgO |
5 | Mg(OH)2 | 3 | MgO + H2O → Mg(OH)2 |
6 | CO2 | 4 | CO2 + Ca(OH)2 → CaCO3 H2O |
7 | Ca(OH)2 | 5 | Fe + O2 + H2O → Fe2O3 |
8 | CaCO3 | ||
9 | Fe2O3 |
NOTES.
- Writing a Chemical Formula is explained only in lX Std.
- Writing a Chemical Equation and Balancing a Chemical Equation is explained only in X Std.
- Chemical Equations [Nos 2 & 5] given in Chapter – Vl are not Balanced.
- The Chemical Name of Fe2O3 is given as Iron Oxide. In fact, the Correct Name is Iron(lll) Oxide or Ferric Oxide.
- The Chemical Formula of Iron Oxide is Fe3O4
8th Standard.
Chapter – lV. Metals and Non – Metals.
Nos | Chemical Formula | Nos | Chemical Equations |
---|---|---|---|
10 | Cu(OH)2 | 6 | 2Cu+H2O+CO2+O2 → Cu(OH)2 + CuCO3 |
11 | CuCO3 | 7 | SO2 + H2O → H2SO3 |
12 | SO2 | 8 | CuSO4+ Zn → ZnSO4 + Cu |
13 | H2SO3 | ||
14 | CuSO4 | ||
15 | ZnSO4 |
NOTES.
- Writing a Chemical Formula is explained only in lX Std.
- Writing a Chemical Equation and Balancing a Chemical Equation is explained only in X Std.
- Compounds of Element like Copper which shows Variable Valency, the correct Chemical Name is given below:
Nos | Formula | Given Chemical Name | Correct Chemical Name |
---|---|---|---|
1 | Cu(OH)2 | Copper Hydroxide | Copper (ll) Hydroxide or Cupric Hydroxide |
2 | CuCO3 | Copper Carbonate | Copper(ll) Carbonate or Cupric Carbonate |
3 | CuSO4 | Copper Sulphate | Copper (ll) Sulphate or Cupric Sulphate |
9th Standard.
Chapter – lll. Atoms and Molecules.
There are no Chemical Equations in this Chapter.
Nos | Chemical Formula | Nos | Chemical Formula |
---|---|---|---|
16 | H2S | 28 | Al2(SO4)3 |
17 | CCl4 | 29 | K2SO4 |
18 | MgCl2 | 30 | KNO3 |
19 | Al2O3 | 31 | Cu(NO3)2 |
20 | CaO | 32 | HNO3 |
21 | NaNO3 | 33 | Na2SO3 |
22 | Na2CO3 | 34 | NH3 |
23 | (NH4)SO4 | 35 | CH3OH |
24 | CaCl2 | 36 | ZnO |
25 | Na2O | 37 | K2CO3 |
26 | AlCl3 | 38 | Na2SO4 |
27 | Na2S | 39 | Na3PO4 |
NOTES.
- If the Radicals were classified into Simple and Compound Radicals, it would help the Students to write the Chemical Formula correctly.
- In ‘Exercise. 4’. [c], Copper Nitrate. To write the Chemical Formula, Valency is required. Instead of Copper Nitrate, if Copper(ll) Nitrate or Cupric Nitrate was given, students, would find it easy to answer the question.
10th Standard.
Chapter – l. Chemical Reactions and Equations.
Nos | Chemical Formula | Nos | Chemical Equations |
---|---|---|---|
40 | Fe3O4 | 9 | Zn + H2SO4 → ZnSO4 + H2 |
41 | CO | 10 | 3Fe + 4H2O[steam] → Fe3O4 + 4H2 |
42 | BaCl2 | 11 | CO + 2H2 → CH3OH |
43 | BaSO4 | 12 | H2 + Cl2 → 2HCl |
44 | SO3 | 13 | 3BaCl2+Al2(SO4)3 → 3BaSO4 +2AlCl3 |
45 | FeSO4 | 14 | 2Na + 2H2O → 2NaOH + H2 |
46 | Pb(NO3)2 | 15 | BaCl2 + Na2SO4 → BaSO4+2 NaCl |
47 | PbO | 16 | CaO + H2O → Ca(OH)2 |
48 | NO2 | 17 | C + O2 → CO2 |
49 | AgCl | 18 | 2H2 + O2 → 2H2O |
50 | AgBr | 19 | CH4 + 2O2 → CO2 + 2H2O |
51 | CuCl2 | 20 | 2FeSO4 → Fe2O3 + SO2 + SO3 |
52 | PbCl2 | 21 | CaCO3 → CaO + CO2 |
53 | CuO | 22 | 2Pb(NO3)2 → 2PbO+4NO2 + O2 |
54 | MnO2 | 23 | 2AgCl → 2Ag + Cl2 |
55 | MnCl2 | 24 | 2AgBr → 2Ag + Br2 |
56 | KOH | 25 | Fe + CuSO4 → FeSO4 + Cu |
57 | Ca(NO3)2 | 26 | Pb + CuCl2 → PbCl2 + Cu |
58 | H2SO4 | 27 | 2Cu + O2 → 2CuO |
59 | AgNO3 | 28 | CuO + H2 → Cu + H2O |
60 | Zn(NO3)2 | 29 | ZnO + C → Zn + CO |
61 | KBr | 30 | MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 |
62 | BaI2 | 31 | 4Na + O2 → 2Na2O |
63 | KI | 32 | 2PbO + C → 2Pb + CO2 |
64 | BaBr2 | 33 | Fe2O3 + 2Al → Al2O3 + 2Fe |
65 | ZnCO3 | 34 | NaOH + H2SO4 → 2Na2SO4 + H2O |
35 | 3H2 + N2 → 2NH3 | ||
36 | 2H2S + 3O2 → 2H2O + 2SO2 | ||
37 | 2K + 2H2O → 2KOH + H2 | ||
38 | 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2 H2O | ||
39 | NaCl + AgNO3 → AgCl + NaNO3 | ||
40 | BaCl2 + H2SO4 → BaSO4 + HCl | ||
41 | Zn + 2AgNO3 → Zn(NO3)2 + 2Ag | ||
42 | 2Al + 3CuCl2 → 2AlCl3 + 3Cu | ||
43 | BaCl2 + K2SO4 → BaSO4 + 2KCl | ||
44 | 2KBr + BaI2 → 2KI + BaBr2 | ||
45 | ZnCO3 → ZnO + CO2 | ||
46 | Mg + HCl → MgCl2 + H2 |
NOTES.
- Equation No: 10 used as an Example for Balancing a Chemical Equation. If a “Word Equation’ is given, students are able to understand the Name of the Reactants and Products.
Iron + Steam → Iron Oxide + Hydrogen - [i] In Equation No: 20. FeSO4 [Ferrous Sulphate]. Fe2O3 [Ferric Oxide]. Without explaining the Variable Valency of Iron, students find it difficult to understand these Chemical Names.
[ii] In Equation Nos: 27 and 28, the Chemical Name given for CuO is Copper (ll) Oxide. Without explaining the Variable Valency of Copper, students find it difficult to understand Chemical Names. - In Equation No: 22, 25 and 26. Compounds of Elements like Lead, Iron and Copper that show Variable Valency, the correct Chemical Name is given below:,
Nos | Formula | Given Chemical Name | Correct Chemical Name |
---|---|---|---|
1 | Pb(NO3)2 | Lead Nitrate | Lead (ll) Nitrate or Plumbous Nitrate |
2 | PbO | Lead Oxide | Lead(ll) Oxide or Plumbous Oxide |
3 | FeSO4 | Iron Sulphate | Iron (ll) Sulphate or Ferrous Sulphate |
4 | CuCl2 | Copper Chloride | Copper (ll) Chloride or Cupric Chloride |
5 | PbCl2 | Lead Chloride | Lead (ll) Chloride or Plumbous Chloride |
- In Exercise No: 7, write Balanced Chemical Equations for the following Reactions:
[c] Students would easily answer the question, if Copper (ll) Chloride was given instead of Copper Chloride. To write the Chemical Formula, Valency is required.
Chapter – ll. Acids, Bases and Salts.
Nos | Chemical Formula | Nos | Chemical Equations |
---|---|---|---|
66 | CH3COOH | 47 | 2NaOH + Zn → Na2ZnO2 + H2 |
67 | Na2ZnO2 | 48 | Na2CO3 + 2HCl → 2NaCl + H2O + CO2 |
68 | NaHCO3 | 49 | NaHCO3+HCl → NaCl+H2O+CO2 |
69 | Ca(HCO3)2 | 50 | CaCO3+ H2O + CO2 → Ca(HCO3)2 |
70 | CaOCl2 | 51 | 2NaCl + 2H2O → 2NaOH+\Cl2 + H2 |
71 | NH4Cl | 52 | Ca(OH)2 + CI2 → CaOCl2 + H2O |
72 | FeCl2 | 53 | NaCl+H2O+CO2+NH3 → NH4Cl+NaHCO3 |
54 | 2NaHCO3 heat → Na2CO3 + H2O + CO2 | ||
55 | 2Al + 3H2SO4 → Al2(SO4)3 + 3H2 | ||
56 | Fe + dil 2HCl → FeCl2 + H2 |
Chapter – lll. Metals and Non – Metals.
Nos | Chemical Formula | Nos | Chemical Equations |
---|---|---|---|
73 | NaAlO2 | 57 | 4Al + 3O2 → 2Al2O3 |
74 | K2O | 58 | Al2O3+ 6HCl → 2AlCl3 + 3lH2O |
75 | HgS | 59 | Al2O3 + 2NaOH → 2NaAlO2+H2O |
76 | HgO | 60 | Na2O + H2O → 2NaOH |
77 | Cu2S | 61 | K2O + 2H2O → 2KOH |
78 | Cu2O | 62 | Ca + 2H2O → Ca(OH)2 + H2 |
79 | ZnS | 63 | 2Al + 3H2O → Al2O3 + 3H2 |
64 | 2HgS + 3O2 → 2HgO + 2SO2 | ||
65 | 2HgO heat→ 2Hg + O2 | ||
66 | Fe + dil 2HCl → FeCl2 + H2 | ||
67 | 2Cu2O + Cu2S → 6Cu + SO2 | ||
68 | 2ZnS+ 3O2 → ZnO + 2SO2 | ||
69 | 3MnO2 + 4Al → 3Mn + 2Al2O3 | ||
70 | S + O2 → SO2 |
NOTES.
- The Chemical Names of ‘Cu2O and Cu2S’ are not mentioned,
Cu2O — Copper (l) Oxide or Cuprous Oxide.
Cu2S — Copper (l) Sulphide or Cuprous Sulphide.
Letter of Appreciation
A copy of ‘THE LANGUAGE OF CHEMISTRY’, ‘PLAYWAY METHOD’ was sent to the ‘NATIONAL COUNCIL OF EDUCATIONAL RESEARCH AND TRAINING. DEPARTMENT OF EDUCATION IN SCIENCE AND MATHEMATICS.
We received a ‘Letter of Appreciation’. Dated July 1st, 2008, with the following comments:
- It is a good attempt for using ‘PLAY – WAY METHOD’, in the
teaching of ‘THE LANGUAGE OF CHEMISTRY’. - Activities given in the manual are thought provoking.
- This is well appreciated that suggested activities follow step up procedure and guidelines for self – assessment are given in the activities.
We suggest that ‘THE LANGUAGE OF CHEMISTRY’, ‘PLAYWAY METHOD’ be introduced as a hand – book in the 7th Std. The students would be able to write ‘Symbols, Chemical Formula and Balanced Chemical Equations’, easily and correctly. Certainly, they would enjoy learning Chemistry.