ICSE Class 9 Chemistry Additional Charts 03 Revision Equations Practice Equations Water Hydrogen

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ICSE Class 9 Chemistry Charts 3 Revision Equations Practice Equations Water Hydrogen Digital Edition

For Class 9 Chemistry, this chapter in ICSE Class 9 Chemistry Additional Charts 03 Revision Equations Practice Equations Water Hydrogen provides a detailed overview of important concepts. We highly recommend using this text alongside the ICSE Solutions for Class 9 Chemistry to learn the exercise questions provided at the end of the chapter.

Charts 3 Revision Equations Practice Equations Water Hydrogen ICSE Book Class Class 9 PDF (2026-27)

Revision Equations - Chapter 6 - Water

Reactions Of Water - With Metals

SubstanceEquation
1. Potassium\(2K + 2H_2O \rightarrow 2KOH + H_2\) [g]
2. Sodium\(2Na + 2H_2O \rightarrow 2NaOH + H_2\) [g]
3. Calcium\(Ca + 2H_2O \rightarrow Ca(OH)_2 + H_2\) [g]
4. Magnesium\(Mg + H_2O \rightarrow MgO + H_2\) [g]
5. Aluminium\(2Al + 3H_2O \rightarrow Al_2O_3 + 3H_2\) [g]
6. Zinc\(Zn + H_2O \rightarrow ZnO + H_2\) [g]
7. Iron\(3Fe + 4H_2O \rightleftharpoons Fe_3O_4 + 4H_2\) [g]

Reactions Of Water - With Non-Metals

SubstanceEquation
8. Coke\(C + H_2O \rightarrow CO + H_2\) [steam] [water gas]
9. Chlorine\(Cl_2 + H_2O \rightarrow HCl + HClO\)

Non-Metallic Oxides

SubstanceEquation
10. Sulphur dioxide\(SO_2 + H_2O \rightarrow H_2SO_3\)
11. Sulphur trioxide\(SO_3 + H_2O \rightarrow H_2SO_4\)
12. Carbon dioxide\(CO_2 + H_2O \rightarrow H_2CO_3\)
13. Nitrogen dioxide\(2NO_2 + H_2O \rightarrow HNO_2 + HNO_3\)

Metallic Oxides

SubstanceEquation
14. Potassium oxide\(K_2O + H_2O \rightarrow 2KOH\)
15. Calcium oxide\(CaO + H_2O \rightarrow Ca(OH)_2\)

Tests - For Water

TestEquation
16. Anhydrous copper sulphate\(CuSO_4 + 5H_2O \rightarrow CuSO_4 \cdot 5H_2O\) [white] [blue]
17. Cobalt chloride\(CoCl_2 + 6H_2O \rightarrow CoCl_2 \cdot 6H_2O\) [blue] [pink]

Biological Importance - Of Dissolved Gases In Water

ProcessEquation
18. Dissolved oxygen - respiration\(C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}\)
19. Dissolved CO2 - photosynthesis\(6CO_2 + 12H_2O \rightarrow C_6H_{12}O_6 + 6H_2O + 6O_2\)
20. Dissolved CO2 - formation of shells\(CaCO_3 + H_2O + CO_2 \rightarrow Ca(HCO_3)_2\)

Water As A - Catalyst

ProcessEquation
21. Synthesis of hydrogen chloride\(H_2 + Cl_2 \rightarrow 2HCl\)
22. Combustion of phosphorus\(4P + 5O_2 \rightarrow 2P_2O_5\)

Teacher's Note

Water's reactivity with metals and non-metals demonstrates why we must store certain chemicals carefully at home, away from moisture and heat.

Practise Equations - Chapter 6 - Water (Contd.)

Reactions Of Water - With Metals

SubstanceEquation
1. Potassium\(K + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]
2. Sodium\(Na + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]
3. Calcium\(Ca + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]
4. Magnesium\(Mg + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]
5. Aluminium\(Al + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]
6. Zinc\(Zn + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]
7. Iron\(Fe + H_2O \rightleftharpoons \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [g]

Reactions Of Water - With Non-Metals

SubstanceEquation
8. Coke\(C + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\) [steam] [water gas]
9. Chlorine\(Cl_2 + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\)

Non-Metallic Oxides

SubstanceEquation
10. Sulphur dioxide\(SO_2 + H_2O \rightarrow \underline{\hspace{2cm}}\)
11. Sulphur trioxide\(SO_3 + H_2O \rightarrow \underline{\hspace{2cm}}\)
12. Carbon dioxide\(CO_2 + H_2O \rightarrow \underline{\hspace{2cm}}\)
13. Nitrogen dioxide\(NO_2 + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\)

Metallic Oxides

SubstanceEquation
14. Potassium oxide\(K_2O + H_2O \rightarrow \underline{\hspace{2cm}}\)
15. Calcium oxide\(CaO + H_2O \rightarrow \underline{\hspace{2cm}}\)

Tests - For Water

TestEquation
16. Anhydrous copper sulphate\(CuSO_4 + 5H_2O \rightarrow \underline{\hspace{2cm}}\) [white] [blue]
17. Cobalt chloride\(CoCl_2 + 6H_2O \rightarrow \underline{\hspace{2cm}}\) [blue] [pink]

Biological Importance - Of Dissolved Gases In Water

ProcessEquation
18. Dissolved oxygen - respiration\(C_6H_{12}O_6 + O_2 \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}} + \text{energy}\)
19. Dissolved CO2 - photosynthesis\(CO_2 + H_2O \rightarrow \underline{\hspace{2cm}} + \underline{\hspace{2cm}} + \underline{\hspace{2cm}}\)
20. Dissolved CO2 - formation of shells\(CaCO_3 + H_2O + CO_2 \rightarrow \underline{\hspace{2cm}}\)

Water As A - Catalyst

ProcessEquation
21. Synthesis of hydrogen chloride\(H_2 + Cl_2 \rightarrow \underline{\hspace{2cm}}\)
22. Combustion of phosphorus\(P + O_2 \rightarrow \underline{\hspace{2cm}}\)

Teacher's Note

Practicing these equations helps you understand how different substances interact with water in various contexts, from laboratory preparations to industrial processes.

Revision Equations - Chapter 9 - Study Of First Element - Hydrogen

Preparations Of Hydrogen - General Methods

Reactions Of Metals - With Cold Water

SubstanceEquation
1. Potassium\(2K + 2H_2O \rightarrow 2KOH + H_2\) [g]
2. Sodium\(2Na + 2H_2O \rightarrow 2NaOH + H_2\) [g]
3. Calcium\(Ca + 2H_2O \rightarrow Ca(OH)_2 + H_2\) [g]

Reactions Of Metals - With Boiling Water Or Steam

SubstanceEquation
4. Magnesium\(Mg + H_2O \rightarrow MgO + H_2\) [g]
5. Aluminium\(2Al + 3H_2O \rightarrow Al_2O_3 + 3H_2\) [g]
6. Zinc\(Zn + H_2O \rightarrow ZnO + H_2\) [g]
7. Iron\(3Fe + 4H_2O \rightleftharpoons Fe_3O_4 + 4H_2\) [g]

Reactions Of Metals - With Dilute Acids

SubstanceEquation
8. Magnesium\(Mg + 2HCl \rightarrow MgCl_2 + H_2\) [g]
9. Aluminium\(2Al + 3H_2SO_4 \rightarrow Al_2(SO_4)_3 + 3H_2\) [g]
10. Zinc\(Zn + 2HCl \rightarrow ZnCl_2 + H_2\) [g]
11. Iron\(Fe + 2HCl \rightarrow FeCl_2 + H_2\) [g]

Reactions Of Metals - With Alkali (Conc. Soln.)

SubstanceEquation
12. Zinc\(Zn + 2NaOH \rightarrow Na_2ZnO_2 + H_2\) [g]
\(Zn + 2KOH \rightarrow K_2ZnO_2 + H_2\) [g]
13. Lead\(Pb + 2NaOH \rightarrow Na_2PbO_2 + H_2\) [g]
14. Aluminium\(2Al + 2NaOH + 2H_2O \rightarrow 2NaAlO_2 + 3H_2\) [g]
\(2Al + 2KOH + 2H_2O \rightarrow 2KAlO_2 + 3H_2\) [g]

Laboratory Method

MethodEquation
15. Zinc - With dil. HCl\(Zn + 2HCl \rightarrow ZnCl_2 + H_2\) [g]

Industrial Method - Bosch Process

ProcessEquation
16. Production of water gas - [CO + H2]\(C + H_2O \xrightarrow{1000°C} [CO + H_2] - \Delta\)
17. Reduction of steam to H2 by CO\(CO + H_2 + H_2O \xrightarrow[Fe_2O_3]{450°C} CO_2 + 2H_2 + \Delta\) [water gas]
18. Removal of unreacted CO2 and CO from the above mixture\(2KOH + CO_2 \rightarrow K_2CO_3 + H_2O\) \(CuCl + CO + 2H_2O \rightarrow CuCl \cdot CO \cdot 2H_2O\)

Tests And Uses

Conversion Of Hydrogen To

ReactionEquation
19. Water\(2H_2 + O_2 \rightarrow 2H_2O\)
20. Hydrogen chloride\(H_2 + Cl_2 \rightarrow 2HCl\)
21. Ammonia\(N_2 + 3H_2 \rightleftharpoons 2NH_3\)
22. Hydrogen sulphide\(H_2 + S \rightarrow H_2S\)

Hydrogen In Metallurgy

ReactionEquation
23. Zinc oxide\(ZnO + H_2 \rightarrow Zn + H_2O\)
24. Iron (III) oxide\(Fe_2O_3 + 3H_2 \rightarrow 2Fe + 3H_2O\)
25. Lead oxide\(PbO + H_2 \rightarrow Pb + H_2O\)

Teacher's Note

Hydrogen preparation methods vary based on the reactivity of the substance involved - highly reactive metals release hydrogen even with cold water, while less reactive metals require heat or acid conditions.

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ICSE Book Class 9 Chemistry Charts 3 Revision Equations Practice Equations Water Hydrogen

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