Write the balanced chemical equations for the following reactions
and identify the type of reaction in each case.
(a) Thermit reaction, iron (III) oxide reacts with aluminium and
gives molten iron and aluminium oxide.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas
to form solid magnesium nitride.
(c) Chlorine gas is passed in an aqueous potassium iodide
solution to form potassium chloride solution and solid iodine.
(d) Ethanol is burnt in air to form carbon dioxide, water and
releases heat.
Answers
Explanation:
Explanation:
(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
Fe_2O_3(s)+2Al\rightarrow Al_2O_3(s)+2Fe(l)Fe
2
O
3
(s)+2Al→Al
2
O
3
(s)+2Fe(l)
Single displacement reaction: Position of one element is exchanged by an other element from its compound.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
3Mg(s)+N_2\rightarrow Mg_3N_23Mg(s)+N
2
→Mg
3
N
2
Combination reaction: Two of the reactants are combining together to give single product.
(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
Cl_2(g)+2KI(aq)\rightarrow 2KCl(aq)+I_2(s)Cl
2
(g)+2KI(aq)→2KCl(aq)+I
2
(s)
Single displacement reaction
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.
C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O+heatC
2
H
5
OH+3O
2
→2CO
2
+3H
2
O+heat
Combustion reaction: Burning of organic compound in the presence of oxygen to give heat, water and carbon-dioxide
a) The reaction of iron (III) oxide and aluminum is initiated by heat released from a small amount "starter mixture". This reaction is an oxidation-reduction reaction, a single replacement reaction, producing great quantities of heat (flame and sparks) and a stream of molten iron and aluminum oxide which pours out of a hole in the bottom of the pot into sand.
b) In the atmosphere, the magnesium ribbon is burnt in the nitrogen gas in order to form magnesium nitride which is in the solid state. Magnesium ribbon is Mg, Nitrogen is N2.
c) KI), the products formed are solid iodine (I
21 ) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:
2KI(aq)+Cl 2 (g)→2KCl(aq)+I s (s)
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat. It is a redox reaction as there is a change in the oxidation number of carbon and oxygen. Carbon is oxidized as it gains oxygen and C2H5OH is the reducing agent while oxygen is reduced, as it loses oxygen and the oxidizing agent is O2.
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