For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield a dienophile must be substituted with electron-donating groups. a. True
b. False

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

The bohr model of the atom explained why emission spectra are discrete. it could also be used to explain the photoelectric effect. which is a correct explanation of the photoelectric effect according to the model?