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secondary 4 | Chemistry
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How come the answer is C?
Date Posted: 2 years ago
Views: 200
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Temperature decrease means the reaction takes in (heat) energy overall ( this is called an endothermic reaction)
So, the total energy needed to break the H-H and Cl-Cl bonds is higher than the energy released when the two H-Cl bonds are formed.
A is obviously wrong as bond breaking requires energy, not releases energy.
B is wrong because two bonds are broken, and two bonds are formed (i.e same number)
D is wrong (see above explanation)
C is correct because the endothermic reaction means there is a net gain in energy. The products thus have more energy than reactants.
So, the total energy needed to break the H-H and Cl-Cl bonds is higher than the energy released when the two H-Cl bonds are formed.
A is obviously wrong as bond breaking requires energy, not releases energy.
B is wrong because two bonds are broken, and two bonds are formed (i.e same number)
D is wrong (see above explanation)
C is correct because the endothermic reaction means there is a net gain in energy. The products thus have more energy than reactants.
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