Allied solutions

Allied solutions

Grade 8

Language of Chemistry | Exercise

Question 12

Q12) Write a balanced molecular equations for the word equations:

  1. Calcium + Oxygen → Calcium oxide

  2. Calcium + Water → Calcium hydroxide + Hydrogen

  3. Zinc + Sulphuric acid → Zinc sulphate + Hydrogen

  4. Lead sulphate + Ammonium hydroxide → Ammonium Sulphate + Lead hydroxide

  5. Copper hydroxide + Nitric acid → Copper nitrate + Water

  6. Lead nitrate + Sodium Chloride → Sodium Nitrate + Lead Chloride

Solution:

(a) 2Ca+\ O_2\ →\ 2CaO

(b) Ca+2H_2O\ →\ Ca\left(OH\right)_2+H_2

(c) Zn+H_2SO_4\ →\ ZnSO_4+H_2

(d) PbSO_4+2NH_4OH\ →\ Pb\left(OH\right)_2+\left(NH_4\right)_2SO_4

(e) Cu\left(OH\right)_2+2HNO_3→\ Cu\left[NO_3\right]_2+2H_2O

(f) Pb\left[NO_3\right]_2+2NaCl\ →\ 2NaNO_3+PbCl_2

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Question 12

Q12) Write a balanced molecular equations for the word equations:

  1. Calcium + Oxygen → Calcium oxide

  2. Calcium + Water → Calcium hydroxide + Hydrogen

  3. Zinc + Sulphuric acid → Zinc sulphate + Hydrogen

  4. Lead sulphate + Ammonium hydroxide → Ammonium Sulphate + Lead hydroxide

  5. Copper hydroxide + Nitric acid → Copper nitrate + Water

  6. Lead nitrate + Sodium Chloride → Sodium Nitrate + Lead Chloride

Solution:

(a) 2Ca+\ O_2\ →\ 2CaO

(b) Ca+2H_2O\ →\ Ca\left(OH\right)_2+H_2

(c) Zn+H_2SO_4\ →\ ZnSO_4+H_2

(d) PbSO_4+2NH_4OH\ →\ Pb\left(OH\right)_2+\left(NH_4\right)_2SO_4

(e) Cu\left(OH\right)_2+2HNO_3→\ Cu\left[NO_3\right]_2+2H_2O

(f) Pb\left[NO_3\right]_2+2NaCl\ →\ 2NaNO_3+PbCl_2

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