the reaction between ethyl alcohol and ethyl bromide forms diethyl ether via a substitution reaction, followed by deprotonation. identify the electrophilic and nucleophilic site of the addition reaction. only two atoms should be labeled. the rest should remain blank.

bcde is the incorrect answer it is a

answersilicon (si); oxygen (o);

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.