2. Dipole- Dipole Force The dipole-dipole force is an interaction between polar molecules. A dipole is two
charges separated by a distance. Therefore, dipole-dipole force is a result of
molecules with positive end in one side and negative end on the other side. The
dipole-dipole force can have along range of interaction and can be strong, if the dipole
moment is high. If this is the case, the dipole moment between molecules is also
high. Example, F-Se: F(4.)--Se (2.4) has electronegativity difference of 1.6 therefore it
is polar.
F-SeF-Se​

answer; (d) i believe the best answer is ; ///people said that man could not fly, but in 1903, orville and wilbur wright made the first sustained powered flight in a heavier- than-air machine;

verdadero

explanation:

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.