Halogenoalkanes have been widely used as aerosol propellants, refrigerants and solvents for many years. fluoroethane, ch3ch2f, has been used as refrigerant. it may be made by reacting ethane with hydrogen fluoride. use relevant bond energies from the data booklet, and the equation below to calculate a value for the bond energy of the c-f bond. ch2=ch2(g) + hf(g) → ch3ch2f(g) ah®= -73 kj mol.

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fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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the dissolution of polymer can be thermodynamically described in 2 steps.