Engineering, 11.04.2020 03:46 ryanpact999
Mechanism. In the presence of acidic or basic conditions, phenol derivatives and formaldehyde polymerize to form phenol-formaldehyde (PF), a thermosetting resin utilized in the manufacturing of wood-based panels. Propose a complete mechanism for the formation of the following PF dimer. (Helpful Hint: Remember to draw intermediates as in basic conditions.)
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Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?
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Mechanism. In the presence of acidic or basic conditions, phenol derivatives and formaldehyde polyme...
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