New Simplified Chemistry Class 7 ICSE Solutions – For your Practice – Symbols, Valencies, formulas, word equations
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1. Fill in the symbol & ion [symbol with valency]
2. Write the chemical formula of the following:
- Sodium hydroxide NaOH
- Sodium nitrate NaN03
- Ammonium hydroxide NH4OH
- Calcium bicarbonate Ca(HC03)2
- Aluminium sulphide A12S3
- Magnesium sulphate MgS04
- Potassium oxide K20
- Magnesium chloride MgCl2
- Potassium carbonate K2C03
- Calcium bisulphite Ca(HS03)2
- Zinc oxide ZnO
- Sodium sulphite Na2S03
- Ammonium nitrate NH4N03
- Zinc chloride ZnCl2
- Magnesium nitrate Mg(N03)2
- Calcium oxide CaO
- Copper [I] oxide Cu20
- Iron [III] sulphate Fe2(S04)3
3. Write word equations for the following:
- 2A1 + 3C12 → 2A1C13
- 2Mg + 02 → 2MgO
- Zn + H2S04 → ZnS04 + H2
- Fe + S → FeS
- Mg + 2HCl → MgCl2 + H2
- 4Na + 02 → 2Na20
- C02 + H20 → h2co3
- CaO + H20 →Ca(OH)2
- 2K + 2H20→ 2KOH + H2
- 4P + 502 →2P2O5
Answer:
- Aluminium + Chloride → Aluminium chloride
- Magnesium + Oxygen → Megnesium oxide
- Zinc + Sulphuric acid → Zinc sulphate + Hydrogen
- Iron + Sulphur → Iron sulphide
- Magnesium + Hydrochloric Acid →Magnesium Chloride + Hydrogen
- Sodium + Oxygen → Sodium Oxide
- Carbon dioxide + Water → Carbonic acid
- Calcium Oxide + Water → Calcium hydroxide
- Potassium + Water → Potassium hydroxide + Hydrogen
- Phosphorous + Oxygen →Phosphorus Pentaoxide