) Balance the chemical equation : Fe(s) + H2O(g) ---> Fe3O4(s) + H2(g)
3Fe(s) + 4H2O(g) ---> Fe3O4(s) + 4H2(g)
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15
Identify the type of each of the following reactions. Also give an example with balanced chemical equation for each. (a) The reaction mixture becomes warm. (b) An insoluble substance is formed
(a) It is an exothermic reaction. CaO(s) + H2O(l) ïŪ Ca(OH)2(aq) + Heat (b) It is a precipitation reaction. Na2SO4(aq) + BaCl2(aq) ïŪ BaSO4(s) + 2NaCl(aq
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15
define redox reactions
oxidation & reduction reactions
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15
When SO2 gas is passed through saturated solution of hydrogen sulphide, the following reaction occurs : SO2 + 2H2S ïūïūïŪ 2H2O + 3S For this reaction, name the substance oxidised, reduced, the oxidizing agent and reducing agent
H2S is oxidised to H2O and is a reducing agent, whereas SO2 is reduced to S and is an oxidising agent
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15
Classify the following as exothermic and endothermic reactions : (a) Photosynthesis (b) Respiration (c) Burning of natural gas (d) Electrolysis of water(b) Respiration
(a) Photosynthesis â Endothermic reaction. (b) Respiration â Exothermic reaction. (c) Burning of natural gas â Exothermic reaction. (d) Electrolysis of water â
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15
Answer the following questions 1. Name the reaction ii) Write the balanced chemical equation
Photchemical and 2AgCl(s)-----> Sunlight 2Ag(s) + Cl2(g
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15
With the help of balanced chemical equations explain why photosynthesis is considered as an endothermic reaction ?
