Yes.
Spiders have eight legs and two more, shorter, limbs at the very fronts of their bodies that are called "pedipalps." They are used the way we use our arms. However, male spiders use their pedipalps to impregnate their mates. The male pedipalp functions like a biological syringe. The male makes a little doily-like web on the ground, discharges semen onto that felt-like silken fabric, and then inserts the tips of its pedipalps into the drop of semen. The semen is sucked into the pedipalps, and later on the male spider inserts each pedipalp into the genital opening of the female spider and the semen is forced out of his pedipalps and into her reproductive system. Therefore, the pedipalps of male spiders are very different from those of female spiders.
Male pedipalps have to be much bigger than those of female spiders. So if you see a spider with two pedipalps that are terminated by big roundish things, then that spider will be a male.
In many species of spider the males are very much smaller than the females. All they have to do is to deliver a couple of small droplets of semen to the female. They don't have to produce hundreds of eggs, guard the eggs, guard the babies for a while after they have hatched, etc. So there is no particular biological reason for male spiders to be big. In fact, if they are small enough it may be very difficult for the female to catch them before or after intercourse, and since they are so small it may not even be worth the effort to catch them to eat them. So maybe that is the reason that in lots of spider species the males are much smaller than the females.
In many spiders that have good vision because they are hunting spiders (e.g., lynx spiders, fishing spiders, wolf spiders, and jumping spiders), the males may look different from the females. Looking special helps ensure that the female will realize that this other spider is a male and not a female coming to try to kill her, and that this spider is a male of the female's own species. The male's special appearance is also involved in the elaborate dance that many species of hunting spiders use to identify themselves by species and then to "entrance" the female spider so that she will put aside thoughts of eating him and let him mate with her.
do female and male arthropods look different
No. In most cases, female spiders are bigger than male spiders.
Not usually. Markings can differ between male and female spiders of the same species, however male spiders are not usually lighter in color. They are typically smaller than female spiders though.
Some species of female spiders do eat the male spiders after mating. Since spiders are intraguild predators, meaning that they eat each other, female spiders eat male spiders of the same and other species as food all the time.
Different species vary - some spiders don't spin webs.. but it is not true that only female spiders spin webs - both male and female do - otherwise how would the male spiders catch their food?
they look the same
Male and female spiders mate, then the female spider lays her eggs in a safe place where they will eventually hatch out into tiny baby spiders.
yes....look at humans
Only slightly.
the female eats the male and then breeds
yes but there are exceptions like the funnel web spiders in Australia , in that case the male is 5 times more dangerous than the female
it look different because it does different jobs and one is male and the other one is female