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svp [43]
3 years ago
8

Chemical reactions in which large molecules are built from small molecules are classified as ______ reactions. In contrast, ____

__ reactions involve breaking large molecules down into smaller ones.
Chemistry
1 answer:
Luda [366]3 years ago
6 0
<h2>Exothermic and Endothermic Reaction</h2>

Explanation:

  • Chemical reactions in which large molecules are built from small molecules are classified as exothermic reactions. During these reactions, a huge amount of energy is released.
  • When bonds are formed to attain its stability there is the loss of energy as heat energy.  
  • In contrast, Endothermic reactions involve breaking large molecules down into smaller ones. During this reaction, a large amount of energy is involved.
  • When bonds break to attain its stability there is gain of energy.
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Explanation:

Firstly, we convert what we have to percentage compositions.

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The percentage compositions is as follows:

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Now, we divide the percentages by the molar masses.

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Now we divide the percentages by these masses

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