Chemistry
(i) Define : Relative atomic mass.
(ii) Why is it necessary to balance a chemical equation ?
(iii) Calculate the percentage of nitrogen in ammonium phosphide. (At.wt. : N = 14, P = 31, O = 16)
Related Questions
Name the gas evolved in each of the following cases:
(i) Copper carbonate is heated strongly
(ii) Lead nitrate is heated
(iii) Nitrogen combines with hydrogen
(iv) Copper sulphate is heated strongly
(v) Addition of sodium to cold water
What do you observe when :
(i) Ammonium chloride crystals are heated in a test tube ?
(ii) Iron nails are added to copper sulphate solution ?
(iii) Lead nitrate crystals are heated strongly?
(iv) Silver nitrate solution is mixed with sodium chloride solution?
(v) Blue copper sulphate crystals are heated ?
(i) Balance each of the following chemical equations :
FeCl3 + NH4OH ⟶ NH4Cl + Fe(OH)3
Zinc + Nitric acid ⟶ Zinc nitrate + Nitrogen dioxide + Water
(ii) Identify the substance which matches the description given below:
- White crystalline substance which sublimes on heating.
- The metal that cannot displace hydrogen from dilute hydrochloric acid.
Define or explain the following terms :
(i) Absolute temperature
(ii) Valency
(iii) Ozone depletion
(iv) Electrovalent bond
(v) Atom