Chemistry, 12.12.2019 00:31 erenackermanlevijaeg

Which of the following reactions are redox reactions? which of the following reactions are redox reactions? ca(s)+cl2(g)→cacl2(s) hcl(aq)+naoh(aq)→h2o(l)+nacl(aq) zn(s)+fe2+(aq)→zn2+(aq)+fe(s) ba(no3)2(aq)+k2so4(aq)→baso4(s)+2kn o3(aq)

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Answer from: josephvcarter

Answer : The redox reactions are:

$Ca(s)+Cl_2(g)\rightarrow CaCl_2(s)$

$Zn(s)+Fe^{2+}(aq)\rightarrow Zn^{2+}(aq)+Fe(s)$

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(1) $Ca(s)+Cl_2(g)\rightarrow CaCl_2(s)$

This reaction is a redox reaction.

In this reaction, the oxidation state of 'Ca' changes from (0) to (+2) that means 'Ca' lost 2 electrons and it shows oxidation reaction and the oxidation state of 'Cl' changes from (0) to (-1) that means 'Cl' gain 1 electron and it shows reduction reaction.

(2) $HCl(aq)+NaOH(aq)\rightarrow H_2O(l)+NaCl(aq)$

This reaction is a double-displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.

In double-displacement reaction, the oxidation state of cation and anion remains same on both side of the reaction. So, it is not a redox reaction.

(3) $Zn(s)+Fe^{2+}(aq)\rightarrow Zn^{2+}(aq)+Fe(s)$

This reaction is a redox reaction.

In this reaction, the oxidation state of 'Zn' changes from (0) to (+2) that means 'Zn' lost 2 electrons and it shows oxidation reaction and the oxidation state of 'Fe' changes from (+2) to (0) that means 'Fe' gain 2 electron and it shows reduction reaction.

(4) $Ba(NO_3)_2(aq)+K_2SO_4(aq)\rightarrow BaSO_4(s)+2KNO_3(aq)$

This reaction is a double-displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.

In double-displacement reaction, the oxidation state of cation and anion remains same on both side of the reaction. So, it is not a redox reaction.

Answer from: Quest

3 hours because it is a decent distance.

Answer from: Quest

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

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