Using the bond energies (kJ/mol) H–H 436, Br–Br 193, H–Br 366, estimate the enthalpy change for H $_{2}$ + Br $_{2}$ → 2HBr.

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Using the bond energies (kJ/mol) H–H 436, Cl–Cl 243, H–Cl 432, estimate the enthalpy change for H $_{2}$ + Cl $_{2}$ → 2HCl.
Using the bond energies (kJ/mol) H–H 436, F–F 155, H–F 565, estimate the enthalpy change for H $_{2}$ + F $_{2}$ → 2HF.
A reaction has $Δ H = - 92$ kJ. Which statement about the reaction is true?
Given C + O $_{2}$ → CO $_{2}$ , $Δ H = - 394$ kJ, and CO + ½O $_{2}$ → CO $_{2}$ , $Δ H = - 283$ kJ, find $Δ H$ for C + ½O $_{2}$ → CO.
How much heat does 50 g of water absorb when it warms from 20 °C to 30 °C? (specific heat capacity $c = 4.18$ J g $^{- 1}$ °C $^{- 1}$ )
Which statement about breaking chemical bonds is true?