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s344n2d4d5 [400]
3 years ago
14

Identify a reason that chemical reactions release energy during the reaction process.

Chemistry
2 answers:
Bess [88]3 years ago
5 0

Answer:

option b

Explanation:

When the energy is released the process is called exothermic reaction. This happens when the bonds are broken in the reactants and the system release energy.

Usimov [2.4K]3 years ago
5 0

<u>Answer:</u>

<em>a. forming bonds</em>

<u>Explanation:</u>

The energy required to break a bond is endothermic that is energy is absorbed to break a bond.

The energy is released in the formation of a bond that is energy is released when a bond is formed.

The formula to find the ∆H of the reaction is  

∆H (reaction) = ∆H (bonds Broken) - ∆H (bonds formed)

For example  

N_2+3H_2< >2NH_3

N_2 contains one N≡N triple bond (Bond breaking 946 KJ per mol)

H_2 contains a single H-H bond (bond breaking 436 KJ per mol)

NH_3 contains 3, N - H single bonds(389 KJ per mol)

So ∆H (bonds broken) = 946 + (3 × 436) = 2254KJ

∆H (Bonds formed ) = (2 × 3 × 389) = 2334KJ

So

∆H (reaction) = 2254 KJ - 2334 KJ

= - 80KJ and the reaction is Exothermic

In this example we see energy required to break the bond is lesser than energy released in forming the bond.

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                                         pH  =  pKa  +  log [A⁻] / [HA]   -------- (1)

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                                         pKa  =  -log 1.37 × 10⁻⁴

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Putting value of pKa and pH in eq.1,

                                         4.29  =  3.863 + log [lactate] / [lactic acid]

Or,

                   log [lactate] / [lactic acid]  =  4.29 - 3.863

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Taking Anti log,

                             [lactate] / [lactic acid]  =  2.673

Result:

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