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Chemical changes___ involve the breaking and making of chemical bonds. 1)sometimes 2)always. 3) never

2 Answers

3 votes

Answer:

Chemical changes always involve the breaking and making of chemical bonds.

Step-by-step explanation:

In chemical changes, the atoms regroup to form new substances. As the first law in Thermodynamic says, "energy cannot be created or destroyed"

User SilverHorn
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3 votes

Answer:

Option 2 Always is the Answer

Step-by-step explanation:

Breaking of bonds requires energy. Absorption of energy takes place to break a bond.

Formation of a bond results in the release of energy.

Hence breaking of bonds is an endothermic process and formation of a bond is exothermic.

The enthalpy of a reaction or the Heat energy of a reaction is given by


\Delta H=E_p-E_r


E_p stands for energy of products


E_r stands for energy of reactants

If
E_p>E_r then ∆H will be Positive and the reaction is Endothermic

If
E_p<E_r then ∆H will be Negative and the reaction is Exothermic

User Liselle
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