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Magazine Chapter 4: Q7E (page 215)
Colourful fireworks often involve the decomposition of barium nitrate and potassium chlorate and the reaction of metals magnesium, aluminium, and iron with oxygen.
(a)Write the formulae of barium nitrate and potassium chlorate.
(b)The decomposition of solid potassium chlorate leads to the formation of solid potassium chloride and diatomic oxygen gas. Write an equation for the reaction.
(c) The decomposition of solid barium nitrate leads to the formation of solid barium oxide, diatomic nitrogen gas and diatomic oxygen gas. Write an equation for the reaction.
(d)Write separate equations for the reactions of the solid metals magnesium, aluminium and iron and oxygen gas to yield the corresponding metal oxides.(Assume the iron oxide contains \(F{e^{3 + }}\)ions.)
Short Answer
(a) Formulae of barium nitrate and potassium chlorate:\(Ba{\left( {N{O_3}} \right)_2},KCl{O_3}\)
(b) Equation for decomposition of solid potassium chlorate:\(2KCl{O_3}\left( s \right) \to 2KCl\left( s \right) + 3{O_2}\left( g \right)\)
(c) Equation for decomposition of solid barium nitrate:\(2Ba{\left( {N{O_3}} \right)_2}\left( s \right) \to 2BaO\left( s \right) + 2{N_2}\left( g \right) + 5{O_2}\left( g \right)\)
(d) Formation of metal oxides:
\(2Mg\left( s \right) + {O_2}\left( g \right) \to 2MgO\left( s \right)\)
\(4Al\left( s \right) + 3{O_2}\left( g \right) \to 2A{l_2}{O_3}\left( s \right)\)
\(4Fe\left( s \right) + 3{O_2}\left( g \right) \to 2F{e_2}{O_3}\left( s \right)\)
Step by step solution
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