Enthalpy and Hess's Law (HSC SSCE Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why do chemical reactions involve energy changes?
Why do chemical reactions involve energy changes?
Bonds are broken and formed
What is bond energy measured in?
What is bond energy measured in?
Why is bond energy always a positive value?
Why is bond energy always a positive value?
Breaking bonds requires energy input
What type of process is bond breaking?
What type of process is bond breaking?
Endothermic
What type of process is bond making?
What type of process is bond making?
Exothermic
What does equal in terms of bond energies?
What does equal in terms of bond energies?
Energy to break bonds - energy released
When is a reaction exothermic based on bond energies?
When is a reaction exothermic based on bond energies?
More energy released than required
What type of reaction is the formation of water from hydrogen and oxygen?
What type of reaction is the formation of water from hydrogen and oxygen?
Exothermic
Why is formation of nitric oxide endothermic?
Why is formation of nitric oxide endothermic?
Breaking N≡N and O=O needs more energy
How does higher bond energy affect compound reactivity?
How does higher bond energy affect compound reactivity?
Makes compound less reactive