Energetics

Why does the following exothermic reaction not occur?
C (Diamond) ⟶ C (Graphite) ΔH = –3 kJ/mol

 
 
 
 

The average bond dissociation energy for the C–H bond is 412 kJ/mol.
Which of the following processes will have an enthalpy change close to 412 kJ/mol?

 
 
 
 

What does it show when a chemical reaction is exothermic?

 
 
 
 

Which reaction do you expect to be a reversible reaction?

 
 

Formation of which hydrogen halide from the elements is an endothermic reaction?

 
 
 
 

What does it show when a chemical reaction is exothermic?

 
 
 
 

The average bond energies for O–O and O=O are 146 and 496 kJ/mol respectively.
Find the enthalpy in kJ for the following reaction:
H–O–O–H ⟶ 2OH

 
 
 
 

Which of the following reactions has the least value of activation energy?

 
 
 
 

The following reaction is an exothermic reaction:
H₂ + Cl₂ ⟶ 2HCl
From where does the energy come to break the bonds of H₂ and Cl₂?

 
 
 
 

When NaOH and HCl are mixed, the temperature increases. The reaction is

 
 
 
 

What are the products of anaerobic respiration?

 
 
 
 

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