Question

QUESTION 2 (a) Write chemical equations to show what happens when each of the following substances is mixed with water: (i) Hydrocyanic acid (ii) Potassium sulfate (iii) Silver bromide (iv) Hydroiodic acid (b) Write chemical equations for the following processes: (i) Chemical reaction for AHⓇ for C3H BrNHz(s) Combustion of 1 mol of C6H6(1) (iii) Fusion of gold (iv) Oxidation of water to produce oxygen gas (v) Neutralization of 1 mol of barium hydroxide by phosphoric acid (vi) Thermal decomposition of 1 mol of potassium chlorate to produce oxygen gas and potassium chloride 2

Answer 1

(a)

i)HCN+H2O gives CN- +H3O+

ii)K2SO4+H2O gives 2K+ (aq) +SO42-

iii)AgBr+H2O gives no reaction

because the solubility product is very low .so it is very less reactive with water.so it remains as solid AgBr.

iv)HI+H2O gives I^- ++H3O+

b)ii)

C6H6+7/2O2 gives 6CO2+3H2O

iv)2H2O gives 2H2+O2

v)Ba(OH)2+H3PO4 gives Ba3(PO4)2+H2O