Chemistry, 26.08.2019 04:30 dilibngalmira

Achemical reaction between iron atoms and oxygen molecules can only occur if
(1) the particles are heated
(2) the atmospheric pressure decreases
(3) there is a catalyst present
(4) there are effective collisions between the particles

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Answer from: leahphi

option (4) there are effective collisions between the particles

Justification:

The collision theory explains the chemical reactions in terms of collisions. A chemical reaction takes place if two molecules collide effectively.

So, the first conditon is that the collision occur.

The second condition, that the collision be effective requires two conditions:

1) that the collision occurs with the proper orientation of the molecules, and

2) that the energy of collision be high enough to start the break of the original bonds ant the creation of the new bonds in the activated complex.

The energy required to form this activated complex is the activation energy.

So, an effective collision requires the proper orientation of the molecules when they collide and that the energy be equal or greater than the activation energy.

Temperature and catalyst are factors that affect the occurrence of those collisions, so they affect the rate of the reaction, by modifiying the number of collisions.

Answer from: Quest

here we have to get the change of moles on decrease the volume of the reaction in gas phase.

the per the given options it will decrease by (d) 11-50%

we know, on decreasing the volume of the gas phase reaction the reaction moves to the product side.

the reaction: so₂cl₂ (g) = so₂ (g) + cl₂ (g) total

the moles at equilibrium: 1 - α α α = 1+α

concentrations: 1 - α α α = 1 + α

(concentration = moles/volume, as volume is 1 l)

(where α is the degree of dissociation)

now the dissociation constant in terms of concentration is :

$k_{c}$ = $\frac{[so2cl2] x [cl2]}{[so2cl2]}$

or, $\frac{\alpha ^{2} }{(1-\alpha)v }$

or, $k_{c}$ = $\frac{\alpha ^{2} }{(1-\alpha) }$ (at v = 1l)

the reaction: so₂cl₂ (g) = so₂ (g) + cl₂ (g) total

the moles at equilibrium: 1 - α α α = 1+α

concentrations: (1 - α)/0.5 α/0.5 α/0.5 = (1 + α)/0.5

thus, the dissociation constant in terms of concentration is :

$\frac{[so2cl2] x [cl2]}{[so2cl2]}$

or, $\frac{\alpha ^{2} }{(1-\alpha)0.5 }$

$\frac{\alpha ^{2} }{(1-\alpha) }$ = $\frac{\alpha ^{2} }{(1-\alpha) 0.5}$

so, the change of 1 : 1/0.5

or, 1: 2

thus it will decrease by 50%.

or, as per the given options it will decrease by 11-50%

Answer from: Quest

i believe it is a.) released into

explanation:

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Achemical reaction between iron atoms and oxygen molecules can only occur if
(1) the particles...

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